Why does increasing the temperature generally increase the rate of a chemical reaction?

It increases the number of collisions between particles

It decreases the activation energy

It changes the color of the reactants

It increases the mass of the products

Which of the following best explains why a catalyst increases the rate of a chemical reaction?

It provides an alternative pathway with lower activation energy

It increases the temperature of the reaction

It increases the concentration of reactants

A reaction is carried out at two different temperatures: $$25^\circ$$ C and $$45^\circ$$ C. At which temperature will the reaction proceed faster, and why?

$$45^\circ$$ C, because particles have more kinetic energy

$$25^\circ$$ C, because particles move slower

$$25^\circ$$ C, because activation energy is lower

$$45^\circ$$ C, because concentration is higher

A student observes that a reaction between a solid and a liquid speeds up when the solid is crushed into a powder. Which factor is being manipulated, and how does it affect the reaction rate?

Surface area; increases rate by exposing more particles to react

Temperature; increases rate by increasing kinetic energy

Concentration; increases rate by adding more reactant

Pressure; increases rate by compressing particles

A chemist wants to slow down a reaction. Which of the following changes would be most effective?

Decrease the concentration of reactants

Increase the surface area of a solid reactant

A reaction between sodium thiosulfate and hydrochloric acid produces a cloudy solution. Design an experiment to investigate the effect of temperature on the rate of this reaction.

Vary temperature, keep other variables constant, and measure time for cloudiness to appear

Keep temperature constant and measure time for cloudiness

Change concentration of reactants and measure temperature

Use a catalyst and measure the temperature change

Explain why increasing the concentration of a reactant increases the rate of reaction, using the collision theory.

More reactant particles means more frequent collisions, increasing the chance of successful collisions

Higher concentration lowers activation energy

More reactant particles decrease the temperature

Higher concentration increases the mass of products

A student adds a catalyst to a reaction and observes that the reaction rate increases. Using your knowledge of activation energy, explain why this occurs.

The catalyst provides an alternative pathway with lower activation energy, so more particles have enough energy to react

The catalyst increases the temperature of the system

The catalyst increases the concentration of reactants

The catalyst increases the pressure of the system

Factors Influencing Reaction Rates

Authored by John Wandago

Science

11th Grade

NGSS covered

Used 1+ times

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20 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a factor that affects the rate of a chemical reaction?

Color of the reactants

Temperature

Shape of the container

Time of day

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does increasing the concentration of reactants generally do to the rate of reaction?

Decreases the rate

Increases the rate

Has no effect

Stops the reaction

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes a catalyst?

A substance that slows down a reaction

A substance that increases the rate of a reaction without being consumed

A reactant in the reaction

A product of the reaction

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does surface area affect the rate of a chemical reaction?

Larger surface area increases the rate

Larger surface area decreases the rate

Surface area has no effect

Surface area only affects gases

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a factor that affects the rate of a chemical reaction?

Pressure (for gases)

Concentration

Mass number of atoms

Temperature

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the temperature of a reaction is increased, what happens to the kinetic energy of the particles?

It decreases

It stays the same

It increases

It disappears

Tags

NGSS.HS-PS3-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following changes will increase the rate of reaction for a gas-phase reaction?

Decreasing the pressure

Increasing the pressure

Decreasing the temperature

Removing the catalyst

Tags

NGSS.HS-PS1-5

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Factors Influencing Reaction Rates

Which of the following is a factor that affects the rate of a chemical reaction?

What does increasing the concentration of reactants generally do to the rate of reaction?

Which of the following best describes a catalyst?

How does surface area affect the rate of a chemical reaction?

Which of the following is NOT a factor that affects the rate of a chemical reaction?

If the temperature of a reaction is increased, what happens to the kinetic energy of the particles?

Which of the following changes will increase the rate of reaction for a gas-phase reaction?

Which factor is most likely to affect the rate of a reaction between a solid and a liquid?

A student increases the concentration of hydrochloric acid in a reaction with magnesium. What is the expected effect on the rate of hydrogen gas production?

Why does increasing the temperature generally increase the rate of a chemical reaction?

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