Energy 2021

Solid magnesium dissolves in a hydrochloric acid, releasing hydrogen gas and heat from a solution of magnesium chloride. What is the sign on ΔH for this reaction?

• Negative because it is exothermic
• Negative because it is endothermic
• Positive because it is exothermic
• Positive because it is endothermic

Entropy increases from solid, liquid to gas. Why?

• Molecular disorder increases
• Molecular randomness decreases
• Molecules are more energetic
• Molecules are more reactive

Entropy is...

• the natural progression from order to disorder

• the natural progression from disorder to order

Based on the energy of the reactants and products, this reaction is...

• endothermic

• exothermic

• Endothermic

• Exothermic

Energy can be classified into these two categories.

• Potential and kinetic
• Gravitational and elastic
• Light and sound
• Kinetic and movement

What is kinetic energy?

• Thermal energy
• Nuclear energy
• Energy in motion
• Stored energy

Which is an example of kinetic energy?

• A book sitting on a shelf
• A marble rolling down a ramp
• A parked car
• An elastic band

What is potential energy?

• Thermal energy
• Nuclear energy
• Energy in motion
• Stored energy

What type of energy is stored inside a battery?

• elastic potential energy
• gravitational potential energy
• chemical potential energy
• kinetic energy