Energy

Describe the flow of energy of the system: A cold metal spoon is added to a mug of hot water.

• There is no change in energy between the spoon and the water

• The spoon loses energy and the water gains energy

• The spoon gains energy and the water loses energy

• The spoon and the water gain energy

How does water freeze?

• Chemical energy flows from the water to the surroundings

• Chemical energy flows from the surroundings to the water

• Thermal energy flows from the water to the surroundings

• Thermal energy flows from the surroundings to the water

Which of the following is an endothermic process?

• water in a pond evaporating over time

• burning a scented candle

• activating a hand warmer

• water condensing on a glass

Which of the following is an exothermic process?

• mixing alkseltzer and water and the cup becoming cool

• cheese melting for nachos

• baking a birthday cake

• fireworks on the Fourth of July

In a reaction where the reactants have a higher energy than the products, determine if it is endo/exothermic and whether the change in enthalpy is positive or negative.

• exothermic, -

• endothermic, -

• exothermic, +

• endothermic, +

In a reaction where the products have a higher energy than the reactants, determine if it is endo/exothermic and whether the change in enthalpy is positive or negative.

• exothermic, +

• endothermic, +

• exothermic, -

• endothermic, -

What state of matter has the highest energy?

• solid

• liquid

• gas

• plutonium

What state of matter has the lowest energy?

• solid

• liquid

• gas

• plutonium

What does A represent on the heating curve?

• liquid

• solid

• melting

• freezing

What does B represent on the heating curve?

• liquid

• solid

• melting

• freezing