Activation Energy/Endothermic/Exothermic

What is the activation energy?

• The energy of the products
• The energy of the reactants
• The minimum energy needed by the reactants to form the products.
• The energy lost in the reaction

Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these

How does a catalyst work in speeding up a reaction?

• By lowering the activation energy or reaction

• by giving them more energy

• by making them more available

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

• Exotermic

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

• Endothermic

• Decomposition

• Exothermic

• Indothermic

What has to happen before a reaction takes place?

• Product molecules must collide

• Product molecules must collide with enough power

• Reacting molecules must collide with enough energy

• Molecules must collide with enough power

Explain how increasing concentrations increases the rate of a reaction

• Less collisions occur

• More movement

• More collisions occur

• Less movement

What change in condition increases the speed of the reacting molecules?

• Decreasing temperature

• Increasing temperature

• Decreasing energy

• Increasing power

How can you increase the surface area of a solid?

• Divide the solid into smaller pieces

• Get more solid

• Turn it into a gas

Which letter represents the transition state?

• A

• B

• C

• D

• E