ED - Factors affecting Rate of Reaction

Which event must always occur for a chemical reaction to take place?

• formation of a precipitate

• formation of a gas

• effective collisions between reacting particles

• addition of a catalyst to the reaction system

Increasing the temperature increases the rate of a reaction by

• lowering the activation energy

• increasing the activation energy

• lowering the frequency of effective collisions between reacting molecules

• increasing the frequency of effective collisions between reacting molecules

Tags

NGSS.HS-PS1-5

The energy needed to start a chemical reaction is called

• potential energy

• kinetic energy

• activation energy

• ionization energy

Tags

NGSS.HS-PS1-4

Given the reaction: Mg + 2 H2O → Mg(OH)2 + H2, at which temperature will the reaction occur at the greatest rate?

• 25°C

• 50°C

• 75°C

• 100°C

Tags

NGSS.HS-PS1-5

A piece of Mg(s) ribbon is held in a Bunsen burner flame and begins to burn according to the equation: 2Mg(s) + O2(g) → 2MgO(s). The reaction begins because the reactants

• are activated by heat from the Bunsen burner flame

• are activated by heat from the burning magnesium

• underwent an increase in entropy

• underwent a decrease in entropy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

As the number of effective collisions between reacting particles increases, the rate of reaction

• decreases

• increases

• remains the same

Tags

NGSS.HS-PS1-5

Which conditions will increase the rate of a chemical reaction?

• decreased temperature and decreased concentration of reactants

• decreased temperature and increased concentration of reactants

• increased temperature and decreased concentration of reactants

• increased temperature and increased concentration of reactants

Tags

NGSS.HS-PS1-5

Base your answer to the following question on the table below, which represents the production of 50 milliliters of CO2 in the reaction of HCl with NaHCO3. Five trials were performed under different conditions as shown. (The same mass of NaHCO3 was used in each trial.) Which two trials could be used to measure the effect of surface area?

• trials A and B

• trials A and C

• trials A and D

• trials B and D

Tags

NGSS.MS-PS1-2

In most aqueous reactions as temperature increases, the effectiveness of collisions between reacting particles

• decreases

• increases

• remains the same

Tags

NGSS.HS-PS1-5

Base your answer to the following question on the table below, which represents the production of 50 milliliters of CO2 in the reaction of HCl with NaHCO3. Five trials were performed under different conditions as shown. (The same mass of NaHCO3 was used in each trial.) Which two trials could be used to investigate the effect of concentration of solutions?

• trials A and B

• trials A and C

• trials C and E

• trials B and D

Tags

NGSS.HS-PS1-5