Which of these traits does not cause a change in the reaction rate? A. density B. temperature C. concentration D. particle size

Answers

Answer 1
Answer: Density does not affect the rates of reaction since it doesn't have any effect on the reactivity of the molecules. Density is a physical characteristic that doesn't play into its chemical makeup and thus does not affect the rates of reaction

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Which statement is true because of newtons second law ?a)when the net force on an object increases, the objects acceleration decreases b)when the net force on an object decreases ,the objects acceleration increases c)when the net force on an object decreases, the acceleration doesnt change d)when the net force on an object decreases, the objects acceleration decreases

During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will (1 point).

move across the membrane to the outside of the cell.
stop moving across the membrane.
continue to move across the membrane in both directions.
move across the membrane to the inside of the cell.

Answers

During the diffusion process, when the concentration of molecules on both sides of a membrane is the same, the molecules will continue to move across the membrane in both directions. 

will continue to move across the membrane in both directions.  

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Container A contains 10.0 g of liquid isopropyl alcohol which has a latent heat of vaporization of 732 J/g. Container B contains 10.0 g of liquid ethanol which has a latent heat of vaporization of 841 J/g. Both containers are brought to their respective freezing points. Heat is then removed from both containers at the same rate. The container whose contents will freeze first is:

Answers

By definition, the latent heat associated with melting a solid or freezing a liquid is called the heat of fusion.

Container A has a latent heat of vaporization of 732 J/g.
Container B has a 
latent heat of vaporization of 841 J/g.

Latent heat of vaporization refers to the
 vaporizing a liquid or a solid or condensing a vapour.

This means that Container A boils first because it has lower latent heat of vaporization. 

As you heat a solid, turning it into a gas, the kinetic energy of the molecules are increased to a point where there are no forces of attraction between the molecules. Thus, Container B will freeze faster than Container A

Which of the following substances best conducts electricity in an aqueous solution?a. H2O b. NH3 c. CH3OH d. CaCl2

Answers

The correct option is D.

Substances that can conduct electricity in aqueous solutions are called electrolytes. Calcium chloride is an example of an electrolyte. Ionic compounds are usually good electrolytes, this is because they contain mobile ions, which can carry electricity round an electrical circuit. Both positive and negative ions are present in electrolytes; the positive ions comes from the metals while the negative ions comes from the non metals. These ions are able to move about when the compound is in the molten form or in aqueous solution.

The correct answer is definitely D. CaCl2 
H2O can't be a productor just by itself as it need electrolytes.
CH3OH is non-polar one, so throw it.
You need something form ionic compound range, so the last one is the only suitable answer.

The most stable group of elements on the periodic table is the?A) halogens
B) noble gases
C) alkali earth metals
D) alkaline earth metals

Answers

The most stable because they can contain the most valence electrons in their outer shell. The correct option is B.

Thus, The group of elements on the periodic table known as noble gases, commonly referred to as inert gases, is thought to be the most stable.

They are radon (Rn), krypton (Kr), xenon (Xe), neon (Ne), helium (He), and argon (Ar). Noble gases are extremely stable and less likely to combine chemically with other elements because they contain entire valence electron shells.

Their full electron configurations, which result in low reactivity, are the cause of this stability.

Thus, The most stable because they can contain the most valence electrons in their outer shell. The correct option is B.

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B) Noble gases
Most stable because they have the maximum number of valence electrons their outer shell can hold

Select all that apply. The three subatomic particles are _____. neurons photons protons neutrons charges electrons

Answers

Neutrons, Electrons, and Protons
Neutrons are the neutrally charged particles that are found in the nucleus.
Protons are the positively charged particles that are found in the nucleus.
Electrons are the negatively charged particles that are found in the atom's orbitals/shells

Answer:Neutrons, Electrons, and Protons

51 Draw a Lewis electron-dot diagram for a molecule of bromomethane, CH3Br.

Answers

See attachment for the answer

Each line represents a single bond (two electrons), and the lone pairs of electrons are shown as dots. Carbon forms single bonds with three hydrogen atoms and one bromine atom, resulting in a stable Lewis structure that satisfies the octet rule for each element and minimizes formal charges.

To draw the Lewis electron-dot diagram for bromomethane (CH3Br), follow these steps:

Determine the total number of valence electrons for each element in the molecule:

Carbon (C) has 4 valence electrons.

Hydrogen (H) has 1 valence electron.

Bromine (Br) has 7 valence electrons.

Calculate the total number of valence electrons by adding the contributions from each element:

Carbon: 4 electrons x 1 atom = 4 electrons.

Hydrogen: 1 electron x 3 atoms = 3 electrons.

Bromine: 7 electrons x 1 atom = 7 electrons.

Total = 4 + 3 + 7 = 14 electrons.

Determine the central atom. In CH3Br, carbon is the central atom.

Connect the central carbon atom to the surrounding hydrogen and bromine atoms using single bonds (each bond consists of two electrons).

Distribute the remaining valence electrons as lone pairs on the outer atoms to satisfy the octet rule. Hydrogen can only accommodate two electrons (a duet), and bromine can expand its octet.

Calculate the formal charges to ensure that the Lewis structure represents the most stable arrangement of electrons. In CH3Br, the formal charges should ideally be as close to zero as possible.

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