Energy Level Diagrams

In an endothermic reaction, the energy level of the products is __________ the energy level of the reactants.

• higher
• lower
• unrelated to
• equal to

In an exothermic reaction, the energy level of the products is __________ the energy level of the reactants.

• lower
• unrelated to
• higher
• equal to

Which type of reaction releases heat to the surroundings?

• exothermic
• endothermic
• neutral
• hyperthermic

In which type of reaction is energy absorbed from the surroundings?

• endothermic
• thermic
• neutral
• exothermic

Which type of reaction requires an input of energy to proceed?

• endothermic
• neutral
• spontaneous
• exothermic

What happens to the energy level of the reactants in an exothermic reaction?

• the energy level of the reactants decreases
• the energy level of the reactants becomes unpredictable
• the energy level of the reactants increases
• the energy level of the reactants stays the same

What is the overall effect on the surroundings in an exothermic reaction?

• warmed up
• remained unchanged
• cooled down
• frozen

Which type of reaction is characterized by a decrease in enthalpy?

• exothermic
• endothermic
• spontaneous
• neutral

What is the typical sign of ∆H (change in enthalpy) for an exothermic reaction?

• negative
• zero
• undefined
• positive

Which type of reaction absorbs heat from the surroundings?

• endothermic
• spontaneous
• neutral
• exothermic