Rate of reaction

The following equation shows the reaction between calcium carbonate, CaCO₃ and hydrochloric acid, HCl:

CaCO_3(aq) + 2HCl_(aq) → CaCl_2(aq) + CO_{2 (g)­­} + H₂O_(l)

Which of the following is the suitable method to measure the rate of reaction?

• Change in the temperature of the solution with time

• Change in the volume of carbon dioxide gas with time

• Change in the mass of water with time

• Change in the concentration of hydrochloric acid with time

Tags

NGSS.HS-PS1-5

Which of the following explains the meaning of effective collision?

• The collision where its energy is less than the activation energy

• The collision that has a low energy

• The collision which takes place before a reaction

• The collision that causes a reaction

Which of the following is the meaning of activation energy?

• The minimum amount of energy that particles must have in order to react

• The maximum energy that the particles need to produce effective collision

• The amount of energy used by the particles during a collision

• The amount of kinetic energy of molecules during a collision

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NGSS.HS-PS1-4

Which factors affect the rate of a reaction?

• temperature

• pressure

• concentration

• catalyst

• All of the above

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NGSS.HS-PS1-5

Increase in temperature causes the particles to

• slow down

• move faster

• stay apart from each other

• move in the correct order

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NGSS.HS-PS1-5

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it increases the energy of reactant particles

• it lowers the activation energy

• it increases the frequency of collision

Tags

NGSS.HS-PS1-5

What is the rate of reaction?

• How fast a reaction is

• How loud a reaction is

• How big a reaction is

• How much gas a reaction produces

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NGSS.HS-PS1-5

Grinding an effervescent tablet into powder increases the rate of reaction due to increase of

• concentration

• temperature

• size

• total surface area

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NGSS.HS-PS1-5

As the frequency of ________________ collision increases, the rate of reaction increases.

• time

• speed

• effective

• None

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NGSS.HS-PS1-5

Why does a catalyst increase the rate of reaction?

• it produces extra energy for the reactants

• it increases the speed of the reactant particles

• it increases the frequency of particle collisions

• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5