Chemical Kinetics

In an ENDOthermic reaction, heat is...

• Lost (released)

• Gained (absorbed)

In an EXOthermic reaction, heat is...

• Gained (absorbed)

• Lost (released)

The sun undergoes fusion reactions to produce light, this is an...

• Exothermic Reaction

• Endothermic Reaction

Answer explanation

Light is a type of kinetic energy. Since it is a product of a chemical reaction, it is an exothermic reaction.

Baking a turkey in an oven is an...

• Exothermic Reaction

• Endothermic Reaction

Answer explanation

The turkey will need to absorb heat in order to cook thoroughly. This is an ENDOthermic reaction.

An ice cube melts into liquid water. This is an...

• Exothermic reaction

• Endothermic reaction

Answer explanation

An ice cube will need to absorb heat in order to melt. This is an ENDOthermic reaction.

A potential energy diagram was created for a chemical reaction. This was an ....

• Exothermic Reaction

• Endothermic Reaction

Answer explanation

The potential energy of the reactants is higher than the products. This means that heat (energy) was lost during the reaction.

This graph represents an...

• Endothermic Reaction

• Exothermic Reaction

Answer explanation

The potential energy of the products is more than the energy of the reactants. This implies that energy was GAINED; edothermic reaction.

What is the potential energy of the PRODUCTS?

• 20 kJ

• 30 kJ

• 50 kJ

• 100 kJ

Answer explanation

The product line is at 50 kJ.

Is this an Exothermic or Endothermic reaction?

• Exothermic

• Endothermic

Answer explanation

The potential energy of the products is higher than the reactants. This implies that energy was absorbed during the reaction.

What is the potential energy of the REACTANTS?

• 20 kJ

• 30 kJ

• 50 kJ

• 100 kJ

Answer explanation

The reactant line starts at 20 kJ.