Chemical Energy

Chemical Energy

by Aicelle Velasco

Multiple Choice

What type of reaction occurs in a hand warmer

• exothermic
• endothermic

Multiple Choice

Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color

Multiple Choice

In an endothermic reaction, heat is ...

• taken in or absorbed
• given out or released 

Multiple Choice

If they energy required to break the bonds is greater than the energy given out by making new bonds the reaction is

• Exothermic
• Endothermic
• Neutralisation

Multiple Choice

The rate of a chemical reaction is NOT affected by which of the following:

• temperature
• concentration
• particle size (surface area)
• All of these affect reaction rates

Multiple Choice

How could we make this reaction happen more quickly?

• Decrease the concentration of the acid

• crush the chalk to increase the surface area

• Put the test tube in an ice bath

Multiple Choice

Products will form faster if____________

• the particle size of the reactants are larger.
• temperature is decreased.
• concentration of the reactants are increased.
• the reaction is not stirred.

Multiple Choice

Smaller particle size allows for a _________ surface area to be exposed for the reaction.

• larger

• smaller

• rectangular

• spherical

Multiple Choice

Increasing the ____ causes the particles (atoms

or molecules) of the reactants to move more quickly so that

they collide with each other more frequently and with more

energy.

• Catalyst

• Surface Area

• Temperature

• Concentration

Multiple Choice

________ is the measure of how much area of an

object is exposed.

• Surface Area

• Catalyst

• Temperature

• Concentration

Multiple Choice

Which of the following will lower the rate

of reaction?

• adding an enzyme to the reaction

• decreasing the temperature from 40°C to

  10°C

• breaking a chunk of calcium up into

  smaller pieces

• increasing the amount of solute

  dissolved in a solution

Multiple Choice

A substance used to decrease the rate of a chemical reaction is called an 

• enzyme
• inhibitor

Multiple Choice

What is the purpose  of an enzyme?

• give permission for the reaction
• raise activation energy
• speed up reactions
• control how many reactions occur

Multiple Choice

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

Multiple Choice

The minimum amount of energy needed for colliding particles to react is called the

• Chemical Energy

• Kinetic Energy

• Activation Energy

• Potential Energy