The atomic numbers of the elements are listed in the long form periodic table. The quantity of protons in the nucleus of an element's atom is represented by the element's atomic number.
What is an atomic number?An atomic nucleus' charge determines an element's atomic number, also known as nuclear charge number. This is equivalent to the number of protons in the nucleus of each atom of that element for conventional nuclei, or the proton number. To uniquely identify common chemical elements, one can use their atomic number. Chemical elements are grouped in the periodic system by increasing the amount of protons they contain, and each chemical element has a unique atomic number. As a result, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number. The number of protons that make up an atom's nucleus is known as the atomic number.To learn more about atomic number refer to:
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How do I fill out this chart?
Which substance has a molar mass of 95.2g?
AlCl3
BaCl2
P2O5
MgCl2
The substance which has a molar mass of 95.2 grams is MgCl₂ or magnesium chloride.
What is molar mass?
Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar mass of magnesium chloride is calculated as, 24.2+(35.5×2)=95.2 g.
Thus, the substance which has a molar mass of 95.2 grams is MgCl₂ or magnesium chloride.
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calculate the change in heat for the water. show all calculations. (hint: you must use the heat energy equation here: heat energy
The difference in the thermal energy of the water is 334,56 J. Thermodynamics and Heating The total energy of all the molecules that compose up anything is what is known as heat energy.
Heat is the energy that inevitably transfers from one body to another due to their disparate core temperatures. nonetheless, it is energy in action. Bond lengths and angles serve as the constant equilibrium geometries around which molecules continuously fluctuate due to rotational and vibrational motions. Pure substances are composed of molecules with a common geometrical structure. Heat is not a system's characteristic. We can use the formula Q = mcT to calculate the change in thermal energy.
Q = mc(T2 - t1)
Q = (1) 4.184 J/kg°C (80°C 20°C).
Q = 334.56 J
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The complete question is-
calculate the change in heat for the 1kg water, with initial temperature as 80°C and final temperature as 20°C. show all calculations. (hint: you must use the heat energy equation here: heat energy
If 50.5 g of KBr are dissolved in 400.0 g of water at 25.0 °C in an insulated container, a temperature change is observed. The ∆H of solution of KBr is 19.9 kJ/mol. Assuming that the specific heat of the solution is 4.184 J/(g °C), and that no heat is gained or lost by the container, what will be the final temperature of the solution?
The final temperature of the solution is 30 degrees.
What is the final temperature of the solution?We know that we can be able to obtain the heat that has been evolved or absorbed by the system by the use of the formula that says; q = mcdT
m = mass of the object
c = heat capacity
dT = temperature change
We would then have;
Number of moles of KBr = 50.5 g/119 g/mol
= 0.42 moles
Then;
19.9 * 10^3 * 0.42 moles = 400 * 4.184 * (T - 25)
8358 = 1673.6T - 41840
T = 8358 + 41840/1673.6
T = 30 degrees
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greenhouse gases include all of the following. which gas is thought to have the greatest effect on global warming or increasing global temperatures?
Greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), fluorinated gases such as hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6).
What is the Greenhouse gases ?
Greenhouse gases are a type of gases that can be found in the Earth's atmosphere which act as a blanket and trap the heat coming from the sun. These gases include water vapor, carbon dioxide, methane, nitrous oxide, ozone, and other trace gases. Greenhouse gases are what cause the Earth's atmosphere to be warmer than it would be without them. Due to human activities such as burning fossil fuels, deforestation and agricultural activities, the amount of these gases in the atmosphere has been significantly increased, leading to an increase in the Earth’s average global temperature, known as global warming. This has caused a cascade of climatic changes such as more extreme weather events and rising sea levels, which have a large impact on the environment and human activities. Reducing the emission of greenhouse gases through measures such as increasing energy efficiency, reducing the burning of fossil fuels and planting more trees, can help to reduce the effects of climate change.
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How many molecules are in 8.5 moles of carbon dioxide (CO2)?
According to the Avogadro's number, there are 51.22×10²³ molecules in 8.5 moles of carbon dioxide.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number and number of molecules= number of moles×Avogadro's umber= 8.5×6.023×10²³=51.22×10²³ molecules.
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2K3N + 3CaCl2 → 6KCl + Ca3N2
1 mol K3N = 131.301 g K3N
1 mol CaCl2 = 110.984 g CaCl2
1 mol KCl = 74.551 g KCl
1 mol Ca3N2 = 148.248 g Ca3N2
How many grams of CaCl2 would it take to make 1.5 moles of KCl?
When preparing for work in the fume hood, be sure to gather all necessary tools, glassware, and chemicals
These are the safety precautions that must be taken when performing duties in the fume hood.
What is fume hood?A ventilated enclosure used to trap and exhaust vapors, gases, and nanoparticles is known as a chemical fume hood. The exhaust fan is usually located at the top of the building and draws air through the ductwork connected to the hood before exhausting it into the atmosphere.In advance to reduce the number of times the hood sash is raised and lowered while working in the fume hood, gather all necessary tools, glassware, and chemicals ahead of time. To keep the area tidy and to promote air flow, work as much as possible in the middle of the work surface. If you need to leave the experiment to get something else, lower the sash during this time.The main piece of laboratory equipment that protects laboratory workers who work with hazardous chemicals is a chemical fume hood. Fume hoods, when used properly, protect workers from inhaling chemical gases, vapors, and aerosols.The complete question:
"When preparing for work in the fume hood, be sure to gather all necessary tools, glassware, and chemicals _________ to minimize the number of times the hood sash is raised and lowered. Work as much as possible in the _________ of the work surface to keep the area tidy and promote air flow. If you need to step away from the experiment to obtain another item, _________ the sash during this time."
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What is the final temperature (in °C) of 690.1 g of water
Answer:
32C Is the water hot or cold?
Explanation:
The final temperature of 690.1 g of water is 20.024°C.
To find the final temperature of 690.1 g of water, we need to know the initial temperature and the amount of heat added to the water. Water has a specific heat capacity of 4.184 J/g°C.
Here is an example calculation:
Let's say the initial temperature of the water is 20°C and we add 100 J of heat. To find the final temperature, we can use the equation:
q = mcΔT
where q is the heat added, m is the mass of the water (690.1 g), c is the specific heat capacity of water (4.184 J/g°C), and ΔT is the change in temperature.
Solving for ΔT:
ΔT = q / (mc)
ΔT = (100 J) / (690.1 g × 4.184 J/g°C)
ΔT = 0.024°C
We multiply the original temperature by the temperature change to obtain the final temperature:
final temperature = initial temperature + ΔT
final temperature = 20°C + 0.024°C
final temperature = 20.024°C
So the final temperature of 690.1 g of water is 20.024°C.
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he cover slip was lifted and drops of 10% nacl were added. the photograph on the right side shows the changed appearance of the cells. the observed appearance after adding the nacl is best explained by:
The observed appearance of the cells after adding the 10% NaCl is likely due to the hypertonicity of the solution.
hypertonicity refers to a solution that has a higher solute concentration than the cell, causing water to flow out of the cell and the cell to shrink and become dehydrated. This can also be observed as the cells appear to be wrinkled and contracted.This can cause water to move out of the cell due to osmosis, resulting in the cell becoming dehydrated and shrinking. This is the opposite of hypotonicity, which is a solution with a lower solute concentration, causing water to move into the cell, causing the cell to swell. In biological systems, hypertonicity can cause cells to lose function or even die if the condition is severe or prolonged.
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Write the balanced net ionic equation for the precipitation of zinc phosphate from aqueous
solution:
Include states of matter in your answer.
The precipitation of zinc phosphate from aqueous solution:
Zn2+ (aq) + SO42- (aq) = Zn3(PO4)2 (s)
What is precipitation?The process of precipitation is the formation of a solid from ions and chemical species dissolved in an aqueous solution. When this solid forms, it sinks to the bottom of the solution and remains there rather than remaining suspended. Filtration can be used to further separate the precipitate from the solution.
When two ionic compounds react, the one containing zinc ions and the other containing phosphate anions, the result is the precipitate zinc phosphate. The interaction between those two ionic compounds would be a precipitation reaction, which entails the dissociation of the two ionic compounds in the solution, followed by the bonding of zinc ions and phosphate ions and precipitation.
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A tank contains 5.00 moles of O_2, 3.00 moles of neon, 6.00 moles of H_2S, and 4.00 moles of argon at a total pressure of 1620.0 mm Hg. Complete the following table
The complete table is shown in the attachment in which total 18 moles have a mole fraction of 1, Pressure fraction is also 1 and the total Partial pressure is 1620 mm Hg.
The mole fraction of any ingredient in a mixture is the ratio of the amount of that ingredient's moles to all other ingredients' combined moles. The partial pressure of each gas in a mixture of gases is calculated by multiplying the total pressure by the mole fraction of that gas.
An idea is the partial pressure of a gas (rather than something we can measure). We consider the pressure of each gas in a mixture to be a component of the combination's overall pressure. Each gas has a certain pressure when contained by itself. Those are highlighted and located at the top. The same amounts are then once more pushed into the same container, increasing both the pressure and the total number of moles.
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identify the hybridization state, molecular geometry and approximate bond angle around the sulfur atom for the following molecule
The hybridization state around the sulfur atom is sp2. The molecular geometry is bent/angular, and the approximate bond angle around the sulfur atom is 120°,SO2.
What is the molecular ?
Molecular is a term used to describe the smallest particle of a substance that still has all the properties of that substance. It is made up of atoms, which are the building blocks of all matter. Atoms can bond together to form molecules, which are the smallest units of a chemical compound. Molecules are the basic units of all matter, and they can exist in different forms, such as solid, liquid, and gas. The structure of a molecule can be determined through various methods, such as spectroscopy and X-ray crystallography. By studying the molecular structure of a compound, scientists can better understand its properties and how it behaves in different situations.
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A charged particle creates a(n) _____________field. Once this particle is in motion, this creates a(n) ____________ field.
Explain.
Answer: 1 Electric Field and
2 magnetic field
Explanation: Have a nice day
Step 1:H2(g)+ICl(g)→HI(g)+HCl(g)(slow)Step 2:HI(g)+ICl(g)→HCl(g)+I2(g)(fast)Which of the following represents a rate law for the overall reaction that is consistent with the proposed mechanism?
The rate law that is consistent with the proposed mechanism is [-d[H2]/dt = k[H2][ICl].
The overall reaction is the sum of the two steps, which is:
H2(g) + 2ICl(g) → 2HCl(g) + I2(g)
To determine the rate law for the overall reaction, we need to consider the rate-determining step, which is the step that has the slowest rate. In this case, it is step 1.
The rate-determining step is H2(g) + ICl(g) → HI(g) + HCl(g)
The rate law for this step is -d[H2]/dt = k[H2][ICl]
Since step 2 is fast, we can assume that the concentration of HI is always in equilibrium with the concentrations of H2 and ICl
Therefore, the rate law for the overall reaction is -d[H2]/dt = k[H2][ICl]
So, the rate law that is consistent with the proposed mechanism is [-d[H2]/dt = k[H2][ICl]
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The limiting reactant is
a
the reactant that does not get completely used
b
completely consumed; there is no excess remaining
c
said to be the reactant that is in excess
In the concept of percent yield, the limiting reactant is completely consumed; there is no excess remaining.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .
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Say the acid solution is currently in equilibrium. How would diluting the acid by adding water change the equilibrium position? Le Chatelier's Principle says pure liquids like water do not affect the equilibrium position. Using the equilibrium constant, it is easy to show the reaction should shift towards the right, but how can we show that with Le Chatelier's Principle?
Pure liquids, such as water, have no influence on the equilibrium position, according to Le Chatelier's Principle. It is straightforward to show that the response should shift to the right.
The equilibrium constant is used. According to Le Chatelier's Principle, the system will adjust to changes in focus. The concentration of an acid is often expressed as moles per liter. Increase the amount of solvent (water) on the reactant side of the equation to dilute the in equilibrium acid solution, pushing the system to adapt. I'm a little baffled by the final portion of your request. Pure liquids, such as water, have no influence on the equilibrium position, according to Le Chatelier's Principle. It is easy to illustrate that the reaction should shift to the right. Le Chatelier's Principle is incorporated into the equilibrium equation. If I wanted to show how the system works.
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Consider the reversible reaction
A(g)↽−−⇀B(g)
Which values would indicate that there is more B than A at equilibrium?
=1×10–5
=7000
=8×105
=0.2
Answer:
=8×105
Explanation:
This value represents the equilibrium constant, Kc, of the reaction. The equilibrium constant is a measure of the relative concentrations of reactants and products at equilibrium. If the value of Kc is greater than 1, it means that there is more product than reactant at equilibrium, and if the value of Kc is less than 1, it means that there is more reactant than product at equilibrium.
The value 8×105 is greater than 1, so it means that there is more B than A at equilibrium. =8×105.
Read the Safety Data Sheet (click SDS icon below) of hydrogen peroxide to identify the recommended way to store this substance. SDS Select one: In an open container in a bright and humid environment In a glass, leak-proof bottle on a shelf or cabinet In a tightly closed container in a dry and well-ventilated place In a well-ventilated container in a closed, dry area
The recommended way to store hydrogen peroxide is in a tightly closed container in a dry and well-ventilated place.
What is hydrogen peroxide?Hydrogen peroxide is a chemical compound with the formula H2O2. It is a colourless liquid, slightly more viscous than water, and is a strong oxidizing agent. Hydrogen peroxide is used in a variety of industries and applications, including as a bleaching agent, antiseptic, and disinfectant. It is also used in rocket propulsion and to manufacture rocket fuels. The compound has many other uses, such as in the production of paper, textiles, and dyes, and in water treatment. Hydrogen peroxide is highly reactive, and can be dangerous if handled improperly.
This is to ensure that the hydrogen peroxide does not become contaminated with air, moisture, or other contaminants that could reduce its efficacy. It is also important to store the hydrogen peroxide away from combustible materials and sources of ignition, as well as away from food and beverages. Additionally, it is important to keep the container away from direct sunlight and other sources of heat. Finally, it is important to keep the container away from children and pets.
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microkinetic analysis of oxygen evolution performance at various stages of iridium oxide degradation
Describe the ecosystem process of oxygen evolution at various stages of iridium oxide degradation?
Oxygen evolution is the process by which oxygen gas is released into the atmosphere. This process occurs during the degradation of iridium oxide, a common type of corrosion-resistant material.
What is the atmosphere?
The atmosphere is the collection of gases that surround and are held in place by the Earth's gravitational pull. It is composed mostly of nitrogen and oxygen, and also contains small amounts of water vapor, carbon dioxide, argon, and other trace gases. The atmosphere plays a vital role in sustaining life on Earth, as it maintains temperatures, regulates climate, and shields the planet from harmful radiation. It also provides oxygen for respiration and helps to disperse pollutants into the environment. The atmosphere is constantly in motion, with winds, storms, and other weather patterns changing its composition and distribution. Human activities such as burning fossil fuels are altering the atmosphere, causing climate change and other environmental problems.
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Combustion analysis is commonly used to determine the empirical formula of unknown compounds containing principally C and H. For a compound containing C, H, and O only, which of the following statements is INCORRECT?
"Combustion analysis can evaluate the molecular formula of unidentified compounds containing primarily C and H," is an incorrect statement.
Combustion analysis is a technique used to determine the amounts of carbon and hydrogen present in a compound by burning a sample and measuring the volume of gases produced. It can be used to determine the empirical formula of a compound containing C, H, and O only (which gives the ratio of atoms in a compound and not the actual number of atoms) but not the molecular formula (which gives the actual number of atoms in a compound). The molecular formula of a compound can be determined by other techniques like Mass Spectroscopy, IR spectroscopy, NMR spectroscopy etc.
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which of the following conditions is associated with an increased total ck level in the serum?
Acute or chronic (long-term) damage or degeneration to the heart, brain, or skeletal muscles may be indicated by elevated CK levels.
What circumstances lead to an increase in CK?Cardiovascular illness, trauma, motor neuron diseases, and myopathies all cause elevated CK levels. After engaging in arduous physical activity or prolonged manual labor, individuals in good health may experience a brief increase in CK levels.Acute or chronic (long-term) damage or degeneration to the heart, brain, or skeletal muscles may be indicated by elevated CK levels.You may have some degree of cardiac damage if your CK-MB levels are elevated. Acute injury or a muscular disease may be the cause of your elevated CK-MM readings, which can indicate that you have damaged skeletal muscles. Increased CK-BB levels may indicate a recent stroke or a brain damage of some kind.To learn more about elevated CK levels refer to:
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The clouds of Jupiter are composed mostly of ammonia, NH3, formed by a synthesis reaction between hydrogen, H2, and nitrogen, N2. Assuming all of the substances are gaseous, express the law of conservation of mass quantitatively for this reaction by completing the particle model drawing.
The law of conservation of mass state in the chemical reaction the "mass neither be created nor be destroyed".
The reaction is given as :
N₂ + 3H₂ ----> 2NH₃
Law of conservation of mass means the "mass neither be created nor be destroyed".
The mass of reactant :
N₂ = 2 × 14 = 28 g
3H₂ = 3 × 2 = 6 g
N₂ + 3H₂ = 34 g
The mass of the product :
2NH₃ = 2 (14 + 3) = 34 g
The mass of the reactant is equals to the mass the product. Thus, the mass is same in the reaction.
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label each major part and indicate you understand the process of how neurons send messages to each other.
The dendrites of the axon, labeled 1,major part that receive messages from the connecting neuron.
What is neuron?Neurons are the basic building blocks of the brain and nervous system (also known as neurons or nerve cells). Neurons are the cells in our bodies that receive sensory information from the outside world, give motor commands to our muscles, and convert and relay electrical impulses at each stage of the process.Beyond that, our interactions with them shape who we are as people. However, our approximately 100 billion neurons have close interactions with other cell types known as glia.Neurogenesis is the process by which the brain generates new neurons, which can occur in adults. To make an effective comparison, imagine a neuron as a tree. Dendrites, axons, and the cell body, or soma, are analogous to the branches, roots, and trunk of a tree.The complete question:
"This is an image of a neuron
what is the major part labeled 1?"
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Please help!
When vinegar and baking soda react with
each other in a sealed bag, a gas is
produced. The gas is trapped and the bag
inflates. Which of these procedures would
be best for determining the minimum
amounts of vinegar and baking soda
needed to completely inflate the bag?
JUse different-sized bags, the same
temperature, and the same amounts
of each substance.
K Use different-sized bags, different
temperatures, and the same amounts
of each substance.
L Use the same-sized bags and the
same temperature, and change the
amounts of each substance.
M Use the same-sized bags and
different temperatures, and change
the amounts of each substance.
When vinegar and baking soda react with each other in a sealed bag, a gas is produced. The gas is trapped and the bag inflates. Use the same-sized bags and different temperatures, and change the amounts of each substance. so, option(M) is correct.
What is temperature?
Temperature is a gauge for an object's average particle kinetic energy. The mobility of these particles rises along with the temperature. With a thermometer or a calorimeter, temperature is measured.
What is substance?
Chemical elements and their natural or artificially created compounds are considered substances. A chemical reaction is typically required to create a substance during a manufacturing process.
Therefore, When vinegar and baking soda react with each other in a sealed bag, a gas is produced. The gas is trapped and the bag inflates. Use the same-sized bags and different temperatures, and change the amounts of each substance. so, option(M) is correct.
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Which of the following compounds contains the greatest percent by mass of nitrogen?
(A) NH3
(B) HCN
(C) N2O
(D) NI3
NH3 contains the greatest percent by mass of nitrogen.
What is nitrogen?
All living things require the element of nitrogen. It is a colorless, odorless and tasteless gas that makes up 78% of the Earth's atmosphere. Nitrogen is found in all organic molecules, including proteins, nucleic acids, and other essential molecules for life. Nitrogen is essential for plant growth and is a key component of the nitrogen cycle. Nitrogen is important to the production of fertilizers and is used in industrial processes such as steel making and welding. Nitrogen also plays an important role in the environment, as it is part of the ozone layer and helps to reduce the amount of UV radiation that reaches the Earth's surface. Nitrogen is also used in many medical and pharmaceutical products, such as anesthetics and chemotherapy drugs
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What is the mass, in grams, of 9.56 x 1024 molecules of methanol (CH3OH) ?
Explanation:
Step (1) : find number of moles of (CH3OH)
[tex]moles = \frac{number \: of \: molcule}{6.022 \times {10}^{23} } \\ = \frac{9.56 \times {10}^{24} }{6.022 \times {10}^{23}} \\ = 15.8[/tex]
Step (2): find mass of (CH3OH)
[tex]mass \: = moles \times molecules \: mass \: of \:(CH3OH) \\ = 15.8 \times 32.04 \\ = 506.2g[/tex]
Ao, answer is 506.2 g (approx 506g)
Which of the following options give the correct relationships between the decimal prefixes? Select all that apply. Pay close attention to the sign and magnitude of exponent. -1 mL= 1x10^3 microliters -1GHz=1x10^6 Hz -10^3 kg=1 g -10^9 nm=1m -10ps=1x10^-13 s
The correct relationships between the decimal prefixes is 1 mL= 1x10³ mic.
What is a decimal?
The decimal system was extended to infinite decimal places to represent any real number using an infinite sequence of digits after the decimal separator (see decimal representation). In this context, decimal numbers with a finite number of non-zero digits after the decimal separator are sometimes called trailing decimals. A repeating decimal is an infinite decimal that repeats the same sequence of digits endlessly after some plac.To know more about decimals, click the link given below:
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This chemical reaction follows the law of conservation of mass
Cao(s) + CO₂(g) - CaCO3(s)
How much CaCO3 will be formed if 2.2 grams of CaO are used for this reaction? Assume there are enough reactants to complete the reaction. The final answer should be rounded to one
place after the decimal point
A 1.1 grams
B. 2.2 grams
C 3.9 grams
D 4.3grams
weak bonds, such as hydrogen bonds and van der waals forces, interacting between the r groups dna determines the order of the amino acids, the amino acids are held together by peptire bonds hydrogen bonds between the amino and the carboxyl group of different amino acids
Amino acids are held together by an amide bond, which is also called the peptide bond.
An amino acid is an organic molecule that is made up of a basic amino group (−NH2), an acidic carboxyl group (−COOH), and an organic R group (or side chain) that is unique to each amino acid. The term amino acid is short for α-amino [alpha-amino] carboxylic acid.
the interactions among R groups creates the complex three-dimensional tertiary structure of a protein. The nature of the R groups found in the amino acids involved can counteract the formation of the hydrogen bonds described for standard secondary structures.
Van der Waals (dispersion) forces contribute to interactions of proteins with other molecules or with surfaces.
correct and complete question is :
Describe the term peptide bond and its interaction between R group and How do van der Waals interactions affect Protein structure ?
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