The result of the multiplication of given number in scientific notation is 1.23 × 10⁻⁵. The power of 10 is added in the muiltipication.
What is scientific notation ?Scientific notation is a standard and scientific way of representing numbers. In scientific notation, the numbers are converted with powers of ten. For example a number 5 can be written as 5 × 10°. Similarly 500 can be written as 5 × 10².
The first term in the scientific notation 4.1 × 10° = 4.1 . since 10° = 1.
second terms, 3 × 10 ⁻⁶. Multiply it with 4.1
= 4.1 × 3 × 10 ⁻⁶ = 12.3 × 10 ⁻⁶ = 1.23 × 10⁻⁵.
Therefore, the final answer in scientific notation is written as: 1.23 × 10⁻⁵.The power ten is increased when we move the decimal point to the left.
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Circle the letter of the phrase that completes this sentence correctly. Thenumber of percent values in the percent composition of a compound isa. half as many as there are different elements in the compound.b. as many as there are different elements in the compound.c. twice as many as there are different elements in the compound.
The number of grams of an element divided by the mass in grams of the compound, then multiplied by 100%, is the percent by mass of the element in the compound.
How do you figure out how many grams of an element are included in a given quantity of a compound?Divide each element's atomic weight (found in the periodic table) by the quantity of that element's atoms in the compound. 3. Add up the totals, and then follow the number with the units of grams/mole. You can simply round the atomic weights and the molar mass to the nearest 0.1 g/mole for many (but not all) issues.The number of grams of an element divided by the mass in grams of the compound, then multiplied by 100%, is the percent by mass of the element in the compound.To learn more about percent refer to:
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What is the molarity of a solution containing 10g of NaOH in 500 mL of the solution?
a. 0.25 mol L^-1
b. 0.75 mol L^-1
c. 0.5 mol L^-1
d. 1.25 mol L^-1
The molarity of a solution is defined as the number of moles of solute per liter of solvent. To find the molarity of a solution containing 10g of NaOH in 500 mL of the solution, we can use the formula:
Molarity = moles of solute / liters of solvent
First we need to convert the mass of NaOH to moles. The molar mass of NaOH is 40 g/mol.
moles = mass / molar mass = 10g / 40 g/mol = 0.25 mol
Then we can calculate the molarity by using the formula above
Molarity = moles of solute / liters of solvent = 0.25 mol / (0.5 L) = 0.5 mol L^-1
The answer is c. 0.5 mol L^-1
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Which reagent will you use for the following reaction? CH 3 CH 2 CH 2 CH 3 ⎯→ CH 3 CH 2 CH 2 CH 2 Cl + CH 3 CH 2 CHClCH 3 (i) Cl 2 /UV light (ii) NaCl + H 2 SO 4 (iii) Cl 2 gas in dark (iv) Cl 2 gas in the presence of iron in dark
You will use (iii) Cl2 gas in the dark for the reaction listed in the problem.
What exactly is the reagent?
Reagents are substances or compounds that are added to a chemical reaction to help it produce the desired outcomeA reaction between two or more other substances is frequently induced by the use of reagents, which can be in the form of a solid, liquid, or gas. Reagents can also be used in the laboratory to identify, quantify, or examine a sample's chemical make-up. Chemicals such as acids, bases, salts, solvents, catalysts, enzymes, and other substances are the most typical reagents. Reagents are utilized in a wide range of sectors, including the pharmaceutical, agricultural, electronic, and food manufacturing.To learn more about reagent
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arrange the molecules by the strength of the london (dispersion) force interactions between molecules.
The correct order is iodine>bromine> chlorine. As we move down the halogens the London dispersion forces increase.
London dispersion forces are the intermolecular forces that hold the molecules together. It is one of the van der Waal forces and is sometimes known as induced dipole- induced dipole attraction. It majorly works for noble gases like argon, and neon. In the case of halogens, as we move down the size of the atoms increases and the van der Waal forces become more prominent hence the London dispersion forces also increase. Therefore, iodine has the strongest dispersion force and chlorine has the weakest.
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Q: arrange the molecules by the strength of the london (dispersion) force interactions between molecules.
chlorine gas, bromine gas, iodine gas
Elements in the same
column (group/family) are
Elements in the same group or family in the periodic table are called congeners. For Example, the congeners in Group 1 are Sodium, Potassioum and Lithium.
Elements in the same group or family in the periodic table have the same number of valence shell electrons in their outermost shell. Therefore, they share some of the same physical and chemical properties. They may also share their reactivity properties. When same physical and chemical properties are present in a group, it is called a trend. When an element deviates from a trend, it is called an exception.
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T/F atomic layer-by-layer deposition of pt on pd nanocubes for catalysts with enhanced activity and durability toward oxygen reduction
It's true that pt on pd nanocubes were built up atomically, layer by layer, to make catalysts with better oxygen reduction activity and durability. A chemical element is made up of an atom.
Which is the smallest building block of ordinary matter. Every substance—solid, liquid, gas, and plasma—is made up of neutral or ionised atoms. The average atomic diameter is 100 picometers or less. When one or more reactants gain one or more electrons during a chemical reaction, a reduction reaction takes place. A reduction reaction is always the next step after an oxidation reaction. Redox reactions, often referred to as oxidation-reduction reactions, are chemical processes that also involve the movement of oxygen, hydrogen, or halogens between atoms or molecules in addition to electrons.
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Ethene (C2H4) reacts with halogens (X2) by the following reaction:
C2H4(g) + X2 == C2H4X2(g)
The following figures represent the concentrations at equilibrium at the same temperature when X2 is Cl2 (green), Br2 (brown), and I2 (purple). List the equilibria from smallest to largest equilibrium constant. [Section 15.3]
The correct order for equilibrium constant = K₁ > K₂ >K₃
What is meant by equilibrium?
Alkene ethene and elemental halogen X2 are both used. Halogenation reaction is the name given to the reaction between an alkene and a halogen.The electrophilic addition mechanism is used in this reaction. Elctrophile, X+, is produced in this reaction by elemental halogen (X2).The double bond in the alkene draws this electrophile and binds it to it.Electrophile addition causes the production of a carbocation intermediate.Nucleophile attacks this positive carbon, leading to the production of a 1,2-di halide alkane as a consequence.Ethene (C2H4) and halogen (X2) combine to form 1,2 - dihalide ethane (C2H4X2). The graphic depicts the reaction of halogen (X2) with chlorine (Cl2).On applying this concept in figures :
Given : Green = Cl₂ Brown = Br₂ Purple = I₂ Grey = Ethene
Grey + Green = 1,2- dihalide ethane
a) Number of Cl₂(green ) = 2
number of ethane ( grey ) = 2
Number of 1,2-dichloride alkane( grey + green ) = 8
Plugging these number in equilibrium constant expression :
[tex]k_{1} = 8/ 2*2=8/4=2[/tex]
Hence K₁ for ethene + chlorine = 2
b) Number of Br₂(brown ) = 4
number of ethane ( grey ) = 4
Number of 1,2-dibromide alkane( grey + brown ) = 6
On plugging these values in K expression as :
[tex]K_{2} = 6/4*4=6/16=0.0612[/tex]
Hence K₂ for ethen + Bromine = 0.375
c) Number of I₂(purple ) = 7
number of ethane ( grey ) = 7
Number of 1,2-diiodide alkane( grey + purple ) = 3
On plugging values in K expression as:
[tex]K_{3} = 3/7*7=3/49=0.0612[/tex]
Hence K₃ for ethene + Iodine = 0.0612
So , the order of equilibrium constant (K) from largest to smallest :
K₃ = 0.0612 K₂ = 0.375 K₁= 2
K₁ > K₂ >K₃
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which of the following binds to plasma proteins? peptide hormones steroid hormones both peptide and steroid hormones neither peptide nor steroid hormones
The most likely answer is that it is malleable and ductile.
What is periodic table?The periodic table is an organized arrangement of the known chemical elements. It is arranged in order of increasing atomic number (the number of protons in the nucleus of an atom). Each element is placed in a specific location because of its atomic structure. The table is organized into rows and columns, with each element represented by its atomic number, symbol, name, and atomic mass. The periodic table is used to predict the properties of elements, as well as their compounds. It is also used to identify the elements in a compound and determine the number of atoms present in a given sample.
Section A of the periodic table is made up of the alkali metals, which are generally soft and have low melting points, making them malleable and ductile. They are also solid at room temperature and poor conductors of electricity.
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medication order reads: ampicillin 500 mg im q 6 hrs. supply on hand: 1 gm vial, use label below for further information. patient's weight 136 lbs . give ml
ampicillin 500 mg im q 6 hrs. supply on hand: 1 gm vial. the medication order is to give 3.0845 ml of ampicillin every
To calculate the amount of ampicillin to administer, you will need to first convert the patient's weight from pounds to kilograms. One kilogram is equal to 2.20462 pounds. So, 136 pounds is equal to 61.69 kilograms.
Next, the medication order states that the patient should receive 500 mg of ampicillin every 6 hours. To calculate the daily dosage, we can multiply the 500 mg dose by the number of doses per day (24 hours / 6 hours = 4 doses per day) which gives us 2000 mg/day.Now, we can use the patient's weight to determine the appropriate dosage per weight. The recommended dosage of ampicillin is 25-50 mg/kg/day. In this case, we will use 50mg/kg/day. So we can calculate the dosage as 50mg/kg/day * 61.69 kg = 3084.5 mg/day. To convert the dosage in mg to ml, we can use the information on the vial. The vial contains 1 gm of ampicillin, which is equal to 1000mg. So we can divide the dosage in mg by the concentration of the vial.3084.5mg/1000mg = 3.0845ml. Therefore the medication order is to give 3.0845 ml of ampicillin every.
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the value for h of the following reaction is -126 kj/mol. you are tasked with making 2.00 moles of naoh. how much heat is transferred into or out of the system in the process? select the answer with the sign that properly indicates the direction of heat flow.
The value for h of the following reaction is -126 kJ/mol. you are tasked with making 2.00 moles of NaOH. 63 kJ heat is released out of the system in the process.
Exothermic chemical reactions are those that release energy. When bonds are broken in the reactants during exothermic reactions, more energy is released when bonds are formed in the products. The reaction mixture's temperature rises as a result of exothermic reactions.
Now, consider the given equation:
2 Na₂O₂ (s) + 2 H₂O (l) → 4NaOH (s) + O₂ (g)
Given, ΔH = -126 kJ
As we know,
4 moles of NaOH - (-126) kJ
2 moles of NaOH - X
it means,
4 × X = (-126) × 2
⇒ 4X = -252
⇒X = -63kJ
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The complete question is:
The value for h of the following reaction is -126 kJ/mol. you are tasked with making 2.00 moles of NaOH. how much heat is transferred into or out of the system in the process? select the answer with the sign that properly indicates the direction of heat flow.
2 Na₂O₂ (s) + 2 H₂O (l) → 4NaOH (s) + O₂ (g)
A) 252
B) 63
C) 3.9
D) 7.8
Many different arrangements of electrons in an atom (configurations) are possible. One configuration will always be lowest in energy. This most stable configuration of an atoms electrons is called the ground state We can identify the ground state of most atoms by determining if a configuration obeys all three of the basic ground state rules (auf bau principle, Hund's rule, and the Pauli Exclusion principle). For each of the following configurations, indicate if the configuration is a ground state or which of the three ground state rules it violates a. 1s 2s 2p 3d 4p 1s 2s 2p 4s 3d 4p 2p 1s 2s 3s 3p 4s 4p configuration (a) I Choose l configuration b) Choose ] configuration (c) Choose l
Configuration (a) - Ground state Configuration (b) - Violates Hund's Rule Configuration (c) - Violates Pauli Exclusion Principle.
What is configuration?Configuration is the process of setting up and fine-tuning a system to meet a user's specific needs. It is a process of organizing and customizing a system or device to meet the specific requirements of its user. This process is often used to customize a device or system to fit the user’s individual preferences, such as setting up a laptop for a specific user or configuring a complex network for a business. Configuration includes installing and configuring hardware, software, and other settings. It also involves troubleshooting any issues that may arise during the process.
Configuration (a) is a ground state. It obeys all three of the ground state rules.
Configuration (b) violates the Aufbau principle, as electrons should fill the lowest available energy levels first.
Configuration (c) violates the Pauli Exclusion principle, as each orbit can only contain two electrons with opposite spin.
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complete the mechanism for this reaction by adding the missing curved arrow notation and lone pair electrons. then in part two select the common elementary steps.
Curved arrows are very important in organic chemistry and using them in common is essential to mastering the subject.
In fact, it is like the operating system of organic mechanism, so the sooner you master the principle behind it, the easier it will be for you to understand many concepts in organic chemistry. Every curved arrow has a head and a tail for showing the flow of electrons from a high electron density to a low electron density center. The arrow must start from the middle of a lone pair or a covalent bond.
In this reaction, the electrons move from the Cl to the carbon and as a result, a new bond is formed.
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Use the following table of bond energies to calculate the molar enthalpy of combustion (in kJ/mol) of acetylene (C₂H₂) gas in oxygen, based on the following chemical equation:
C₂H₂(g) + 2.5O₂(g) → 2CO₂(g) + H₂O(g)
The heat of combustion of the reaction is -859 kJ/mol.
What is the enthalpy of combustion?When we talk about the enthalpy of combustion, we mean the heat that is required in order to burn up the compound in the presence of oxygen. Recall that the heat of reaction is gotten by the use of the formula;
Sum of the bond energies of the reactants - Sum of the bond energies of the products
As such, we have;
[(1 * 835) + (2 * 411)] - [(2 * 799) + (2* 459)]
= (835 + 822) - (1598 + 918)
=1657 - 2516
= -859 kJ/mol
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calculate the density of 3.00 x 10^2 gram object that has a volume of 48.5mL. Enter your answer in the provided box
Answer:
6.22 g/mL
Explanation:
To calculate the density of an object, you divide its mass by its volume (d = m/v).
In this case, the mass of the object is 3.00 x 10^2 grams and the volume is 48.5 mL.
So the density = (mass (g)) / (volume (mL)) = (3.00 x 10^2) / (48.5) = 6.22 g/mL
______ pipe is very durable, corrosion resistant, and can be used for hot-water distribution lines, but it doesn't last as long as copper piping.
Brass
Brass pipe is very durable, corrosion resistant, and can be used for hot-water distribution lines, but it doesn't last as long as copper piping.
Write a brief note on brass?A metal alloy composed of copper and zinc is called brass. Brass is one of the most frequently utilized alloys because of its special qualities, which I'll discuss in more depth below. This alloy is used in a seemingly endless number of products and industries due to its versatility.Brass pipe fittings are frequently used to transport liquids like slurries, chemicals, combustible gases, and water. Brass pipe fittings can connect, modify, or control any liquid or gas in pipes in a variety of shapes and thread sizes.To learn more about Brass, refer:
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Using molecular formulas, write down a balanced molecular equation for the reaction of methyl salicylate with sodium hydroxide to give the sodium salt of salicylic acid. (You will need to figure out the other product
The reaction of methyl salicylate with sodium hydroxide gives the sodium salt of salicylic acid called as sodium salicylate which can be represented as: C7H6O3 + NaOH -> C7H5O3Na + H+
With the chemical formula C7H6O3, salicylic acid is an inorganic substance that is a subclass of phenolic acid and beta-hydroxy acid (BHA). Aspirin is one of the main products made from salicylic acid, which is also known as ortho-hydroxybenzoic acid. It is a crystalline solid with a white hue that is used in the creation of numerous pharmaceutical medicines. Salicylic acid, an organic acid, dissociates to lose a proton from the carboxylic acid functional group in an aqueous solution. It appears in nature as crystals of an organic acid that are transparent and colorless. This compound's salt and ester derivatives, sometimes referred to as salicylates, are frequently utilized in organic chemistry. It combines with sodium hydroxide to produce sodium salicylate.
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A chemist adds 265.0 mL of a 0.122 M barium chlorate (Ba(CIO3)2) solution to a reaction flask. Calculate the mass in grams of barium chlorate the chemist has added to the flask.
The chemist added 0.1424 g of barium chlorate to the flask.
To calculate the mass of barium chlorate added to the reaction flask, we need to use the formula: mass = molarity x volume x molar mass.
First, we need to find the molar mass of barium chlorate. The molar mass is calculated by adding the molar masses of all the atoms in the compound.
The formula for barium chlorate is Ba(CIO₃)₂, which means it is made up of one barium atom (Ba), two chlorine atoms (Cl), six oxygen atoms (O), and two iodine atoms (I).
The molar mass of barium is 137.327 g/mol, chlorine is 35.453 g/mol, oxygen is 15.999 g/mol, and iodine is 126.904 g/mol.
So the molar mass of barium chlorate is (137.327 + 235.453 + 615.999 + 2×126.904) g/mol = 479.205 g/mol.
Next, we need to use the formula mass = molarity x volume x molar mass. We know that the molarity is 0.122 M, the volume is 265.0 mL and the molar mass is 479.205 g/mol. So we can plug these values into the formula: mass = 0.122 x 0.265 x 479.205.
After converting the volume to L and using the formula, we get 0.1220.265479.205 = 0.1424 g.
So the chemist added 0.1424 g of barium chlorate to the flask.
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There are 12 inches in 1 foot. which of the following conversion factors express this relationship correctly? select all that apply.
12 in/1 ft
1 in x 12 ft
1 ft/12 in
1/(1 in x 12 ft)
Answer:
12 in/1 ft and 1 ft/12 in
Explanation:
The conversion factor means the equal value of the expression.
Here in this case, "there are 12 inches in 1 foot is the statement" which means one foot contains 12 inches.
In the given options, 12 in/1 ft means 12 inches per 1 foot, and 1ft/ 12in means 1 foot for 12 inches which are technically the same.
There is a formula that supports this statement. That is
Conversion factor = Required yield / Recipe yield
or
Conversion factor= What you need/ What you have
Hence both 12in/1 ft and 1ft/ 12 in are the correct answers.
the coinage metals, cu, ag, and au, all lie in one column of the periodic table. consider ag. an atom of ag will have a certain ground state electron configuration according to the aufbau principle. the outermost electrons in ag will have the configuration select all that apply
The electron configuration for silver (Ag) is based upon the place meant of silver in the fifth row of the periodic table in the 11th column of the periodic table or the 9th column of the transition metal or d block. Therefore th electron configuration for silver must end as [tex]4d^{9}[/tex].
What is meant by electron?
Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound).One of the three main types of particles within an atom is an electron that is bonded to it; the other two are protons and neutrons.An atom's nucleus is made up of electrons, protons, and neutrons.The exterior of the nucleus is surrounded by negatively charged electrons in orbit.It can be challenging for scientists to monitor them since they rotate so quickly.They are the tiniest particles in an atom and are drawn to the protons' positive charges; one proton can hold 2000 of them.[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{9}[/tex]
This notation can be written in core notation or noble gas notation by replacing the [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6}[/tex] with the noble gas [Kr].
[Kr] [tex]5s^{2} 4d^{9}[/tex]
For some of the transition metals they will actually transfer an s electron to complete the d orbital, making silver,
[Kr] [tex]5s^{1} 4d^{10}[/tex]
I hope this was helpful.
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estimate the approximate co2 concentration in 2100, assuming that the co2 concentration continues to rise as fast as it did from 1975 to 2010.
By 2100, CO2 levels rise to about 420 ppm, almost 20 ppm over current levels, which, when additional forcings are taken into account, equals 475 ppm (in CO2e). Global temperatures are predicted to increase by 1.3–1.9C over pre-industrial levels by 2100.
According to climate models that simulate a high emissions scenario (RCP8.5), the world's average temperature will rise by at least 4 °C by 2100. Model simulations based on scenarios that would reduce emissions significantly and continuously through the end of the century (RCP2). According to climate models that simulate a high emissions scenario (RCP8.5), the world's average temperature will rise by at least 4 °C by 2100. Model simulations based on scenarios that would reduce emissions significantly and continuously through the end of the century (RCP2).
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Which of the following equation describe(s) particle-like behaviour? Which describe(s) wavelike behaviour? Do any involve both types of behaviour?
a. C=γλ b. E=mc 2
c. γ= Z
n 2
a 0
d. E=hγ e. λ= m v
h
When light travels from one medium (such as air) to another (such as water), its direction changes. Refraction describes this wave-like behavior.
What is particle-like behavior and wavelike behavior?The particle-like behavior is most visible due to quantum mechanics phenomena associated with measurement. The uncertainty principle dictates that when the particle's location is measured, it is forced into a more localized state.All waves have distinct characteristics. They can be refracted, reflected, interfered with, and diffracted.Light can be defined as both a wave and a particle. Two experiments in particular have demonstrated the dual nature of light.Here,
(a) c = vλ , wave speed, wavelength, and frequency are all purely wave properties that describe wave motion.
(b) E = mc²
Because mass is a particle property, it represents particle behavior.
(c) r = n²a₀/Z. Here radius, definite position for particle, thus describing particle behavior.
(d) Since E = hv is a wave property, this equation describes a wave function.
(e) λ = h/mv. Here m is particle property and λ wave property. As a result, it describes both particle and wave behavior.
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Please help I don't get this please just help me and quick it's a virtual lab.
The identification of the specimens with the aid of a dichotomous key is given below:
LegsWingsAntennaeStinger ClawsThe specimen used here is a butterfly because of the parts shown and their various functions.
What is a Dichotomous Key?A dichotomous key aids in the identification of unidentified specimens based on their traits since it consists of a sequence of questions has a straightforward yes/no format, is based on observable traits, and lets you concentrate on crucial characteristics.
The specimen used here is a butterfly.
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the two gas samples represented in the graph above are at the same temperature. which of the following statements about the gases is correct?
C is correct. Gas Z has a smaller molar mass than gas X because of the concept of kinetic energy.
As shown in the diagram, there are two gases Z and X. It is provided in the data that the temperature of the gases are the same, which indirectly says that the kinetic energy of both gases is same. Kinetic energy is the term that defined energy stored in the particles due to their motion or velocity. Its SI unit is Joule. And its formula is [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex] . So kinetic energy of Z= Kinetic energy of X.
Therefore, the gas with a higher molecular speed will have a lower molecular mass. And it can be seen from the graph that Z has more speed, so it will have a smaller molar mass.
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Q: the two gas samples represented in the graph above are at the same temperature. which of the following statements about the gases is correct?
A. Z has more kinetic energy than X
B.Fewer molecule in present in Z
C. Z has smaller molar mass
D. Z has larger molar mass
what is the molecular relationship between the pair of molecules below? select your answer from the drop down box below.
The first molecule has methyl in the second position and -OH in the third. But in the second, methyl is in position 3 and -OH is in position 2. Consequently, the compounds listed(See Picture) are constitutional isomers.
The exact pair being discussed will determine the molecular connection between the two molecules. It is hard to ascertain the connection without further background knowledge or details regarding the pair of molecules.
Structure-related isomers, stereoisomers, enantiomers, conformers, tautomers, protonation states, and other connections between molecules are examples. Understanding the connection is crucial in areas like pharmaceutical chemistry and materials science since it will alter the characteristics and reactivity of the molecules. With the information available, it is impossible to establish the link between the two molecules. It would be essential to know more about the characteristics, chemical structure, and bonding of the two molecules in order to identify their connection. It is impossible to ascertain their relationship without this information.
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The complete question is:
What is the molecular relationship between the pair of molecules below (See Picture)?
for the following unbalanced chemical equation, suppose that exactly 5.05 g of each reactant is taken. determine which reactant is limiting, and calculate what mass of each product is expected (assuming that the limiting reactant is completely consumed). enter the formula for the limiting reactant.
We must count the moles of each reactant and divide this amount by the reactant's psychometric coefficient in order to identify the limiting reactant.
The limiting reactant would have the lowest value.
S (32 g/mol), Divide the amount of moles of S (5/32 = 0.15625) by the psychometric factor, 1 to get 0.15625.
For H2SO4, Divide the number of moles of H2SO4 by the psychometric coefficient,2 which comes to 0.02551.
Therefore the limiting reactant is H2SO4.
Mass of each product once the limiting reactant has been completely used up.
Mass of H2O = 0.0510 mol H2SO4 * (2 mol H2O/ 2 mol H2SO4) * (18 g H2O/ 1 mol H2O) * 0.918 mol H2O = 0.918 g H2O.
Mass of SO2 is equal to 0.0510 mol H2SO4 * (3 mol SO2/ 2 mol H2SO4) * (64 g SO2/ 1 mol SO2) * (4.896 g).
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there are three sets of sketches below, showing the same pure molecular compound (hydrogen chloride, molecular formula ) at three different temperatures. the sketches are drawn as if a sample of hydrogen chloride were under a microscope so powerful that individual atoms could be seen. only one sketch in each set is correct. use the slider to choose the correct sketch in each set. you may need the following information: melting point of : boiling point of :
Boiling point is -85°C , this implies that above this temperature HCl will be in gaseous phase.
Here melting point is -114.8°C , this implies that below this temperature HCl will be in solid phase.
Now, Boiling point is -85°C , this implies that above this temperature HCl will be in gaseous phase.
Solid -------> -114.8°C ------> Liquid -------> -85.1°C --------> gaseous
A :- Temperature -131°C here HCl will be present in solid state, and molecules will present in orderly fashion.
B :- Temperature -98°C here HCl will be present in Liquid state, and molecules will present in less orderly fashion.
C :- Temperature -53°C here HCl will be present in gaseous state, and molecules will present far apart.
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Which of the following pieces of information is/are necessary to calculate the molar mass of a compound? Select all that apply.
The atomic masses of each of the elements that make up the compound is the following pieces of information are necessary to calculate the molar mass of a compound.
What is mass?
It is possible to quantify inertia, a fundamental property of all matter. The resistance a body of matter offers to a change in its speed or position brought on by the application of a force is effectively what it is.
What is molar mass ?
To calculate the molar mass of a compound, it is frequently necessary to sum the qualitative atomic masses (in g/mol) of each individual atom. Titanium is a good example, with a mass of 47.88 amu (or 47.88 g/mol). In 47.88 kilos of the metal, or 6.022 x 1023 atoms, there are one mole of titanium.
Therefore, atomic masses of each of the elements that make up the compound is the following pieces of information are necessary to calculate the molar mass of a compound.
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Which change in energy is taking place in this image ?
Answer:
Pretty sure it's B
Explanation:
List the properties of acids and bases. Which of the properties would you use to safely test whether an unknown substance was an acid or a base?
Acids taste sour, react with metals,
and turn blue litmus paper red. Bases
taste bitter, feel slippery, and turn red
litmus paper blue. Use of litmus paper.
Acids are chemical substances that are defined by a sour taste in an aqueous medium.
These acids may have the tendency to turn into blue litmus red. On the other side, bases are chemical substances that are defined by a bitter taste and are slippery to the touch.
There are some bases that are soluble in water, while others are not, there are two types of litmus paper that are available that can be used to identify acids and bases:
They are known as Red litmus paper and blue litmus paper.
A blue litmus paper changes into red under acidic conditions and red litmus paper changes into blue under basic or alkaline conditions. These chemical properties are very useful in identifying substances.
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Your lab partner did not take careful notes during today's chemistry experiment. You see these numbers written without labels: 37.3 grams, 40 grams, 93.3% before asking your partner, you decide to predict which number is the predicted yield, the actual yield, and the percent yield. Justify your answer. Make a list of the factors that will increase the reaction rate of a chemical reaction.
Based on the given information, it is not possible to accurately predict which number is the predicted yield, the actual yield, and the percent yield without additional information or context. The percent yield is calculated by comparing the actual yield to the predicted yield, which are both typically measured in grams or moles.
The list of the factors that will increase the reaction rate of a chemical reaction are
Increasing the temperature Increasing the concentration of reactants Increasing the surface area of the reactants: What is chemical reaction?The Factors that can increase the reaction rate of a chemical reaction include:
Increasing the temperature: as temperature increases, the kinetic energy of the reactant particles increases, making it more likely for them to collide and react. Increasing the concentration of reactants: as the concentration of reactants increases, the number of reactant particles in a given space increases, making it more likely for them to collide and react.Lastly, Increasing the surface area of the reactants: as the surface area of the reactants increases, the number of reactant particles in contact with each other increases, making it more likely for them to collide and react.
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