Collision Theory

What are the minimum requirements for a chemical reaction to occur according to collision theory?

• Molecules must collide with proper orientation and sufficient energy.

• Molecules must be of similar size.

• Molecules must be in a liquid state.

• Molecules must have a neutral charge.

What does not change with an increase in temperature according to collision theory?

• The percentage of high-energy collisions.

• The proper orientation of molecules during collision.

• The collision frequency.

• The average speed of molecules.

Tags

NGSS.HS-PS1-5

What happens to the rate of chemical reactions at higher temperatures?

• It increases.

• It first increases then decreases.

• It decreases.

• It remains constant.

Tags

NGSS.HS-PS1-5

What is the role of a catalyst in a chemical reaction?

• It increases the temperature of the reaction.

• It provides an alternative reaction pathway.

• It decreases the activation energy.

• It changes the reactant concentrations.

Why do most chemical reactions go faster at higher temperatures?

• Because the activation energy decreases.

• Because molecules are larger at higher temperatures.

• Because the reactants turn into gases.

• Because molecules collide more often and with more energy.

Tags

NGSS.HS-PS1-5

What does the Arrhenius equation relate?

• The rate constant to the activation energy and temperature.

• The activation energy to the rate of reaction.

• The temperature to the concentration of reactants.

• The rate constant to the concentration of reactants.

Tags

NGSS.HS-PS1-5

What unit must temperatures be in when using the Arrhenius equation?

• Fahrenheit

• Celsius

• Rankine

• Kelvin

What does an increase in temperature do to the collision frequency in a chemical reaction?

• Decreases it

• Does not affect it

• Increases it

• First increases it, then decreases it

Tags

NGSS.HS-PS1-5

What is not affected by the reactant concentrations in a chemical reaction?

• The rate constant

• The rate of reaction

• The activation energy

• The collision frequency

Tags

NGSS.HS-PS1-5

What must be matched in units when performing calculations with the Arrhenius equation?

• The activation energy and the gas constant

• The temperature and the rate constant

• The concentration of reactants and products

• The pressure and volume of reactants

Tags

NGSS.HS-PS1-5