A) have lower melting points. Compared with solid ionic compounds, solid molecular compounds generally have lower melting points.
Ionic compounds are held together by the electrostatic attraction between positively and negatively charged ions, while molecular compounds are held together by weaker van der Waals forces between neutral molecules. The strong electrostatic forces in ionic compounds give them high melting and boiling points, while the weaker intermolecular forces in molecular compounds result in lower melting and boiling points. Due to this reason, solid molecular compounds generally have lower melting points than solid ionic compounds. The strong ionic bonds in ionic compounds require more energy to overcome in order to melt or boil the compound, while the weaker intermolecular forces in molecular compounds are easier to overcome.
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In the activity series, the more active elements are found ____________.A. at the bottom. B. in the middle. C. at the top. D. Both (a) and (c)
Answer: At the top
What is Activity Series?
An activity scale is a kind of element classification system that ranks how responsive certain elements are to other elements. The activity series determines reactivity based on how well a particular element can displace hydrogen gas from acidic solutions and water.
Reactivity of elements:
The reactivity of metals is based on imperfect external orbitals or electronic configurations. Metals tend to donate electrons and thus form positively charged ions. Higher atomic number metals tend to be more reactive because their electrons are farther from the positively charged nucleus, making them easier to remove.
Hence, The most reactive metal is at the top of the row and the least reactive metal is at the bottom.
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For the compound fecl3, we can, with the aid only of a periodic table, determine its
a. molarity and molar mass
b. mass percentage
c. molar mass and molecular formula
d. mass percentage, molar mass, and empirical formula
From the periodic table, we can find the molar mass and the molecular formula. Option C.
What can we see from the periodic table?We can see that we can be able to locate several elements in the periodic table. In the periodic table of the elements, the elements can be classified in groups and periods.
The groups tell us the number of the valence electrons that we can be able to find in the atom that we are looking at. Now we know that the valency of iron and chlorine can be read off from the periodic table as well as the masses of the elements and this can help us to find the molar mass and the molecular formula.
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N₂ + H₂=NH3
What volume of hydrogen is necessary to react with 8.0 L of nitrogen to produce ammonia at STP?
The rate of concentration change for hydrogen in the reaction N2 + 3H2 +NH3 is -0.3x10-4 Ms-1.
What is the limiting reactant of N2 3H2 --> NH3?N2(g)+3H2(g) NH3 (g) If equal amounts of each reactant are utilised, hydrogen will be the limiting agent because it takes 3 moles of hydrogen to produce 1 mole of ammonia.The mole ratio for ammonia and nitrogen gas is 2:1, as illustrated by the chemical equation for ammonia generation in figure 1.NPC:N Ratio Calculation in a Parenteral Nutrition Tutorial. Following are the calculations for the nonprotein kcalorie to nitrogen ratio (NPC:N): Calculate the amount of nitrogen you consume each day (1 g N = 6.25 g protein). Subtract grammes of nitrogen from the overall nonprotein kcals. It is the ratio of a substance's mass of carbon to nitrogen (in this case, soil).To learn more about change refer to:
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While at your couin’ BBQ you notice a rock in the yard and take it home. You determine the rock ha a ma of 2. 5 kg and a volume of 4000 mL. What i the denity of the rock in kg/m^3?
The density of the rock calculated by using the density formulas is 0.625 kg/m^3.
To find the density of the rock, we need to divide its mass by its volume. The equation for density is:
Density = Mass / Volume
We are given the mass of the rock as 2.5 kg and the volume as 4000 mL. To use these units in the equation, we will need to convert the volume from milliliters to cubic meters.
1mL = 0.001 m^3
So, 4000 mL = 4 m^3
Then, we can substitute these values into the equation and solve for density:
Density = 2.5 kg / 4 m^3 = 0.625 kg/m^3
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which gas must not enter the carboy in order for fermentation to occur?
For fermentation process to successfully occur, Oxygen gas (O2) must not enter the carboy, because the pyruvate used in the process, gets completely oxidized when oxygen gas is present.
Fermentation is a metabolic process that always must take place in the absence of oxygen. Many of the beneficial microorganisms, create desired changes in different types of beverages and foods through this process of fermentation. And the resulting products of fermentation reaction thus formed, have better/more favorable flavor and taste, and also more life as they get preserved during the process. In addition to this, these microorganisms also provide several health benefits.
The process of fermentation to occur successfully, does not require oxygen gas as it is an anaerobic process. If by any chance or means, oxygen gas is present, the pyruvate used would be completely oxidized during the reaction forming carbon dioxide and water molecules as the by products, by the action of yeast spiration. Moreover, these yeast species needed in the reaction, produce ethanol only in an anaerobic (oxygen-less) environment by another process called the Pasteur Effect.
There are generally three types of fermentation processes based on the end products obtained using the pyruvate. They are:
Acetic Acid Fermentation, Lactic Acid Fermentation, and Alcoholic Fermentation.
Therefore, Oxygen Gas is the correct answer to this question.
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4. A study of the ammonia synthesis at 450°C, N₂ + 3H2 → 2NH3, shows that the rate increases by a factor of 9 when the
partial pressure of hydrogen is tripled and the nitrogen pressure is kept constant. The rate increases by a factor of 27 when
the partial pressure of nitrogen is tripled and the hydrogen is kept constant. (a) Find the rate law for the reaction. (B) How
will the rate change if the hydrogen and nitrogen are both doubled?
N2(g) + 3H2(g) 2NH3(g) + Heat is our equilibrium reaction. Let's imagine that we raise the nitrogen gas concentration. We anticipate a rightward change in the equilibrium.
Which reactant, and why 2h2 G o2 G 2h2o L, is the limiting reagent?So, the limiting reagent is oxygen. Let's now determine how much hydrogen is present in excess in the reaction mixture. We'll calculate how many moles of hydrogen are needed to react with 0.4688 moles of dioxygen for that.
If the amounts of both reactants are doubled, what happens to the reaction rate?The rate doubles when the concentration doubles. The rate is inversely related to the square of the reactant concentration. The rate increases by four times when the concentration is doubled.
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How many total molecules are in o2?.
There are two molecules of oxygen (O2) in one molecule of O2.
Oxygen (O2) is a molecule made up of two atoms of oxygen. These atoms are bonded together using a covalent bond, which means they share electrons. The molecular formula of O2 is O2, which means that there are two atoms of oxygen in one molecule of O2.
Because of this, there are a total of 2 oxygen atoms and 2 molecules of O2. Oxygen is a colorless, odorless, and tasteless gas that is essential for life and is found in the Earth's atmosphere. It is also used in many industrial processes, such as combustion and respiration, and is a key component of the Earth's carbon cycle.
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What volume of Argon gas (at STP) is equal to 1.60 grams of Argon?
1.60 grams of Argon gas at STP is equal to 11.2 L.
What is standard temperature and pressure?
Standard temperature and pressure (STP) is a set of conditions that are commonly used as a reference point for measuring the properties of gases and other substances. At STP, the temperature is defined as 0 degrees Celsius (273.15K) and the pressure is defined as 1 atmosphere (101.325 kPa).
The volume of a gas at standard temperature and pressure (STP) can be calculated using the ideal gas law:
PV = nRT
Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant and T is the temperature.
At STP, the pressure is 1 atm and the temperature is 0°C (273.15 K)
We can use the equation n = m/M , where n is the number of moles, m is the mass and M is the molar mass.
Given that the mass of Argon is 1.60 grams, we can calculate the number of moles:
n = m/M = 1.60/40 = 0.04 mol
We can substitute the value of n, P, T and R into the ideal gas law to calculate the volume.
V = nRT/P = 0.04 mol * 8.314 J/mol*K * 273.15 K / 1atm = 11.2 L
Therefore, 1.60 grams of Argon gas at STP is equal to 11.2 L.
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Is h2 o2 polar or nonpolar?.
H2O2 is a polar molecule. The oxygen atoms in H2O2 have a partial negative charge, while the hydrogen atoms have a partial positive charge, giving it a dipole moment and making it polar.
H2O2 is a molecule that contains two oxygen atoms and two hydrogen atoms. The chemical formula of H2O2 is H-O-O-H. The two oxygen atoms in the molecule are bonded together by a covalent bond, and each oxygen atom is bonded to a hydrogen atom by a covalent bond.
Due to the presence of two oxygen atoms in the molecule, the H2O2 molecule has a polar nature.
This is because oxygen atoms are more electronegative than hydrogen atoms, which means that the oxygen atoms will have a stronger pull on the electrons in the covalent bonds.
This causes the electrons in the covalent bonds between the oxygen atoms and the hydrogen atoms to be unevenly distributed, giving the molecule a partial negative charge on the oxygen atoms and a partial positive charge on the hydrogen atoms. This uneven distribution of electrons creates a dipole moment in the molecule, making it polar.
In summary, a molecule's polarity is determined by the difference in electronegativity of its constituent atoms and the molecular shape. In the case of H2O2, the molecule is polar due to the difference in electronegativity between the oxygen atoms and the hydrogen atoms, which causes an uneven distribution of electrons in the molecule and a dipole moment.
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What is the mass of moles of H2O?.
The mass of moles of H₂O (water) = 18.02 grams.
The method the mass of any molecule, formula unit, or ion is equal to the sum of the average atomic masses of all the atoms in its formula.
H's average atomic mass is 1.01 amu.
O's average atomic mass is 16.00 amu.
Hence,
2 H atoms = 1.01 amu / 1 H atom = 2.02 amu
1 O atoms = 16.00 amu / 1 O atom = 16 amu
2.02 amu + 16 amu = 18.02 amu
So, the mass of moles of H₂O (water) = 18.02 amu = 18.02 grams.
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For an element X it is given that atomic number = 17 and mass number equal 35 write the electronic electron configuration of element X find valency what will be the formula of compound formed between X and Y having valency 3.
Answer:
Electronic configuration of Cl = 2,8,7
Valency of Cl = -1
Explanation:
Given,
The atomic number of X = 17
Element with atomic number 17 = Chlorine(Cl)
The mass number of element = 35
Electronic configuration of Cl = 2,8,7
Valency of Cl = -1
The pressure on a 30 mL sample of an ideal gas increases from 400 K to 1600 K at a
constant pressure. The new volume is?
A 30 mL sample of an ideal gas experiences a continuous pressure increase as the temperature rises from 400 K to 1600 K. The new volume exists 0.015 L.
What is meant by Boyle's Law?Boyle's Law is a gas law that establishes a relationship between pressure and volume of a specific quantity of gas at a fixed temperature.
According to the statement, "The volume occupied by a given gas mass at constant temperature is inversely proportional to the pressure," the volume falls and grows as the pressure changes.
Boyle's law is expressed mathematically as:
Pressure × Volume = constant
or PV = k
If a change in pressure or volume occurs at a constant temperature, the following is true:
P1 × V1 = P2 × V2
The pressure and volume in state 1 are P1 and V1, while the pressure and volume in state 2 are P2 and V2.
In other words, the final pressure divided by the final volume is equal to the product of the starting pressure and the original volume.
P1 = 101.3 kPa = 101,300 Pa (being 1 kPa = 1,000 Pa)
V1 = 30 mL = 0.03 L (1 L = 1,000 mL)
P2 = 202.6 kPa = 202,600 Pa
101,300 Pa × 0.03 L=202,600 Pa × V2
simplifying the above equation we get
[tex]$& V 2=\frac{101,300 P a * 0.03 \mathrm{~L}}{202,600 P a} \\[/tex]
V 2 = 0.015 L
The new volume is 0.015 L.
The complete question is:
The pressure on 30 milliliter of an ideal gas increases from 101.3 kPa to 202.6 kPa at constant temperature. What is the new volume?
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When 16.5 g of calcium carbonate react with an excess of hydrochloric acid, calcium chloride, carbon dioxide, and water vapor are produced. Write the equation. What is the theoretical yield of carbon dioxide
One mole of calcium carbonate reacts with 2 moles of HCl forms one mole of calcium chloride, water and carbon dioxide each. The theoretical yield of calcium chloride from 16.5 g of calcium carbonate is 18.3 g.
What is theoretical yield ?Theoretical yield of a reaction is the amount of product that is calculated theoretically calculated based on the balanced chemical equation.
The balanced equation of the reaction between calcium carbonate and HCl is given as follows:
[tex]\rm CaCO_{3} + 2HCl \rightarrow CaCl_{2} + CO_{2} + H_{2}O[/tex]
Molar mass of calcium carbonate = 100 g/mol
molar mass of calcium chloride = 111 g/mol
Hence, 100 g of calcium carbonate produce 111 g of calcium chloride. Then, mass of calcium chloride from 16.5 g is:
(111× 16.5) /100 = 18.3 g.
Therefore, the theoretical yield of the reaction is 18.3 g of calcium chloride.
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Would you expect hexane to be soluble in water why?
Hexane is not soluble in water.
Hexane is a hydrocarbon compound and is composed of only carbon and hydrogen atoms. Hydrocarbons are nonpolar molecules, and therefore they do not interact well with polar molecules such as water. Because of this, hydrocarbons like hexane tend to be insoluble in polar solvents like water.
Water molecules are polar, which means that they have a partial negative charge on one end and a partial positive charge on the other end. Nonpolar molecules such as hexane, do not have any charges, they do not interact well with water molecules because they do not have any charges to form hydrogen bonds with water molecules.
Furthermore, Hexane is less dense than water, which means that it will float on top of water and will not mix with it.
In summary, hexane is not expected to be very soluble in water because it is a nonpolar hydrocarbon and does not have any charges to interact with the polar water molecules.
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group 10,period 6 name element
Hey there!
Answer:
Platinum (Pt) is the element in group 10, period 6, on the Periodic Table with the atomic number 78. The element is a heavy, malleable, ductile, grey-white transition metal, used in various ways.
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How many ions do
lithium chloride, iron(111) oxide ,
Copper sulphate, calcium chloride and zinc hydroxide have (individually)
One lithium cation Li+ and one chlorine anion Cl- combine to form the molecule. Lithium chloride has a molar mass of 42.39 g/m.
A chemical is what?
A type of matter that has a consistent chemical composition and recognizable properties is referred to as a chemical substance.
A chemical substance cannot be physically separated into its component parts, that is, without rupturing the chemical bonds, according to some.
Simple substances (substances made up of just one chemical element), chemical compounds, and alloys are all examples of chemicals.
Any material with a known composition is considered to be a chemical. So a chemical always contains the same "stuff," to put it another way. Natural substances like water contain certain chemicals. There are also manufactured chemicals like chlorine, which is used in swimming pools or to bleach fabrics.
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What is the need of energy efficiency in cloud computing?.
By optimizing the energy use of cloud computing, businesses can save money on their energy bill and reduce their carbon footprint.
Cloud computing is becoming increasingly popular due to its cost-effectiveness and scalability, but it comes with a cost: energy.
As businesses continue to invest in cloud computing, it is important to understand the need for energy efficiency and the ways this can be achieved.
Furthermore, the most efficient cloud computing systems are more reliable and resilient, making them ideal for businesses that rely on cloud-based services. Investing in energy efficient cloud computing not only saves money, but also helps the environment.
To ensure cloud computing remains a viable long-term solution for businesses, it’s essential for companies to take steps to ensure their cloud infrastructure is energy efficient.
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How many total ATP are produced through ETS only from two?.
Total ATP are produced through ETS only from two molecule of 3-phosphoglycerate is 28 ATP
In the glycolytic process, one molecule of 3-phosphoglycerate will yield one NADH from the creation of pyruvate, and two acetyl co-A from that. When acetyl Co-A enters the Kreb's Cycle, it produces three NADH and one FADH₂.
Now, this NADH and FADH₂will participate in ETS. Total 14 ATP will form in the following ways:
4 NADH total will result in 4 X 3= 12 ATP.
A total of 1 FADH₂ will result in 1 x 2= 2 ATP. Thus, 14 ATP will be created in total. so if there's 2 the total will be 2 x14 ATP = 28 ATP
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Why C2H4 is non-polar?.
C2H4, also known as ethylene, is a non-polar molecule because its atoms are arranged symmetrically. The two carbon atoms are at the center of the molecule and are bonded to two hydrogen atoms each. The two hydrogen atoms on one side of the molecule are identical to the two hydrogen atoms on the other side, so there is no overall dipole moment (uneven distribution of electrons) in the molecule. This means that there is no separation of electrical charge and no polar bonds, making C2H4 a non-polar molecule.
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What is theoretical yield in moles of oxygen when there are 18.3 moles of hydrogen ?
2H2 + O2 --> 2H2O
The theoretical yield of the water in the reaction is 329.4 g.
What is the theoretical yield?
We know that we can be able to obtain the theoretical yield when we look at the stoichiometry of the reaction that we have here. In this case, it is clear that would need to rely on the reaction equation and it would be our guide.
We have that;
2 moles of hydrogen would produce 2 moles of water
18.3 moles of hydrogen would also produce 18.2 moles of water.
Theoretical yield of water would now be;
18.3 * 18 g/mol
= 329.4 g
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what type of chemical bond forms between two atoms bearing opposite charges?
Ionic bonds are created when two oppositely charged ions are attracted to one another by electrostatic force. A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.
An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present. Any elementary particle of matter with at least one proton is referred to as an atom. Examples of atoms are neon (N) and hydrogen (H) (Ne). Chemistry's fundamental building component is an atom. It is the lowest fraction of substance into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.
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Ayala is making salad dressing. She mixes oil and vinegar in a blender until a smooth consistency is formed. Explain whether this is a heterogeneous or a homogeneous mixture and why. Exsplain
This is a homogeneous mixture. A homogeneous mixture is a mixture in which the components are evenly distributed throughout the mixture, meaning that all parts of the mixture have the same composition.
In this case, the oil and vinegar are mixed together in a blender until a smooth consistency is formed. This means that the oil and vinegar are evenly distributed throughout the mixture, creating a uniform composition throughout the entire mixture.
This is different from a heterogeneous mixture, in which the components are not evenly distributed, resulting in a mixture that has different compositions in different parts. For example, a salad with mixed greens, cherry tomatoes, cucumbers, and croutons is a heterogeneous mixture, as the ingredients are not evenly distributed throughout the salad.
Express the diameter of a ground-state hydrogen atom in meters using power of 10. Do not enter the units; they are provided to the right of the answer box:dH : m
The diameter of a ground-state hydrogen atom using the power of 10, in meters, is 1.058 x 10^{-10} using the value of Bohr radius of Hydrogen atom.
Throughout the development of particle physics, under modern science, scientists have created different models to understand the atom. When we talk about the diameter of an atom, we refer to the Bohr radius, which is the radius from the nucleus to the orbiting shell electron.
In the case of a hydrogen atom, it has one electron, and the Bohr radius in the ground state is 5.29 x 10^{-11} meters.
To find the diameter, we would have to multiply the Bohr radius by 2. as diameter is the double of radius.
Diameter of hydrogen in ground-state = 2 x 5.29 x 10^{-11} meters
= 10.58 x 10^{-11} meters
Thus, the diameter of a hydrogen atom in ground-state, using the value of Bohr radius of hydrogen is 1.058 x 10^{-10} meters using power of 10.
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23. Boron combined with oxygen during glass making, creates glass that is *
O bluish in color
O shatter proof
O flexible
O heat resistant
Answer: heat resistant
Boron oxide is added to glass during the manufacturing process, it causes the glass to have a blue tint, increases its strength, and makes it more resistant to breaking and shattering, also increases the heat resistance of glass and makes it more flexible, allowing it to be bent without breaking.
Which one of the following is not true concerning cathode rays? They travel in straight lines in the absence of electric or magnetic fields. They originate from the negative electrode. They are made up of electrons. They impart a negative charge to metals exposed to them. The characteristics of cathode rays depend on the material from which they are emitted.
The characteristics of cathode rays depend on the material from which they are emitted is the false statement concerning cathode rays. The correct answert is E.
These are the traits of cathode rays:
Cathode rays travel from the cathode to the anode.Although these rays cannot be seen directly, their behavior can be studied using phosphor materials like ZnS. These rays move in a straight line in the absence of an electrical or magnetic field.The behavior of cathode rays is consistent with what is predicted for negatively charged particles in the presence of an electrical or magnetic field, indicating that cathode rays are made up of electrons, which are negatively charged particles.The material of the electrodes and the kind of gas present in the cathode ray tube have no bearing on the characteristics of cathode rays (electrons).Learn more about cathode ray at https://brainly.com/question/13665271
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Where are all the noble gases found in the periodic table?
A. Period 1 B. Period 7 C. Group 1 D. Group 18
All the noble gases are found in Group 18 of the periodic table. Hence, Option D is the correct answer
The noble gases are a group of elements found in the periodic table. They are characterized by their stability and low reactivity. The noble gases are helium, neon, argon, krypton, xenon, and radon. All these elements are located in the same group in the Periodic Table, Group 18, also known as the "inert gases" group. They are located on the far right-hand side of the table, and they have the highest electron configurations, which makes them chemically unreactive.
In summary, the noble gases are found in Group 18 of the periodic table and they are helium, neon, argon, krypton, xenon, and radon.
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A McLeod gauge measures low gas pressures by com- pressing a known volume of the gas at constant temperature. If 345 cm of gas is compressed to a volume of 0.0457 cm³ under a pressure of 2.51 kPa, what was the original gas pressure?
The pressure of a gas is the force that the gas exerts on the walls of its container.
How do you determine the initial pressure of a gas?Let’s start with the ideal gas law, PV = nRT. In this equation, ‘P’ represents atmospheric pressure, ‘V’ represents volume in liters, ‘n’ represents the number of particles in moles, ‘T’ represents temperature in Kelvin, and ‘R’ represents the ideal gas constant (0.0821 liter atmospheres per moles Kelvin). The force that a gas exerts on the walls of its container is defined as its pressure.
When you blow air into a balloon, it expands because the pressure of air molecules on the interior of the balloon is greater than on the outside. Pressure is a characteristic that governs the direction of mass flow.
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Which type of reaction is ch4 O2 → co2 H2O an example of?
How many molecules are present in 2. 5 moles of water H2O?.
There are 1.5055 x10²⁴ molecules in 2. 5 mol of O₂
To determine the total number of atoms or molecules in the sample, multiply the number of moles by Avogadro's constant. The formula is:
number of molecule= moles x avogadro's number
The same amount of different gases measured at the same pressure and temperature each have the same number of molecules, one mole of matter has 6.022 x 10²³ atoms.
number of molecule= moles x avogadro's number
number of molecule= 2. 5 mol x 6.022x10²³
number of molecule= 1.5055 x10²⁴
Therefore, there are 1.5055 x10²⁴ molecules in 2. 5 mol of O₂
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Halogens exist in different physical states despite being in the same group. Explain why this is so.
Halogens exist in different physical states despite being in the same group because the reliance on the number of electrons. More and stronger interactions between molecules influence higher temperatures (specifically boiling points). As the atoms increase in size, they grow farther from the center point and are less attracted to it.
