These were the wrong answers please help

Question 1 0 / 1 point
What is the measure of the efficiency of a chemical reaction?

Question options:

Chemical Equilibrium

Reaction Rate

Percent Yield

Limiting Reactant

Question 3 0 / 1 point
Given the following reaction
2Al + 3Cl2 --> 2AlCl3

How many grams of AlCl3 aluminum chloride will be produced from 125 g of Al and 125 g of Cl2 ?

Question options:

618 g AlCl3

157 g AlCl3

1,233 g AlCl3

There is not enough information to determine this

Question 7 0 / 1 point
Which of the following statements are true?

Question options:

The activation energy (Ea) must be overcome in order for a reaction to occur.

Decreasing the temperature of the system increases the surface area.

Increasing the concentration of reactants decreases the amount of products.

The higher temperature you have the less kinetic energy there is.

Question 9 0.2 / 1 point
Which of the following items are factors that influence reaction rates? Select all that apply.

Question options:

Surface Area

Concentration

Temperature

Catalyst

Light

Question 10 0 / 1 point
What does a catalyst do when added to a chemical reaction?

Question options:

It lowers the activation energy.

It increases the activation energy.

It speeds up chemical reactions.

It gets consumed in the reaction.

Question 11 0 / 1 point
Match the words with the proper definitions.

__2__
Increasing this increases the average kinetic energy of the reactant molecules (more collisions means more molecules with energies greater than the activation energy).

__3__
Increasing this will increase the frequency of collisions because you are adding more reactants.

__4__
This increases the rate of a system's reactions without being used up itself.

__1__
Increasing this increases the exposure to other substances, thus increasing the frequency of collisions.

1.
Concentration

2.
Temperature

3.
Surface area

4.
Catalyst

Question 12 0 / 1 point
Which of the following statements are true?

Question options:

Chemical equilibrium is achieved when there is a higher concentration of products.

Chemical equilibrium can never be achieved.

When the concentrations of reactants and products remain constant chemical equilibrium is achieved.

Chemical equilibrium is achieved when there is a higher concentration of reactants.

Question 14 0 / 1 point
How can you identify a reversible reaction from a chemical equation?

Question options:

The chemical equation will be balanced.

The chemical equation will have two arrows pointing in different directions.

The chemical equation will have reactants and products

The chemical equation will state that it is reversible.