Final Chemistry Quiz

In an endothermic reaction, energy is _________.

• absorbed

• released

In an exothermic reaction, heat is ...

• taken in
• given out

A chemical reaction is 2H₂O → 2H₂ + O₂. Based on the law of conservation of mass, how much hydrogen gas is produced compared to the amount of oxygen produced?

• twice as much
• half as much
• the same amount
• four times as much

Which is the correct way to balance the chemical equation

Al + O₂ → Al₂O₃?

• 4Al + 3O₂ → 2Al₂O₃

• 2Al + O₂ → Al₂O₃

• 2Al + 3O₂ → Al₂O₃

• 4Al + 3O₂ → Al₂O₃

Which of the following properties is a physical property?

• magnetism
• reactivity with oxygen
• flammability
• non-reactive

Which of the following is a chemical property of water?

• Reacts with pure sodium.
• Boils at 100 ^oC.
• Dissolves sugar easily. 
• Has a density of 1 gm/mL

What two quantities are needed to calculate density?

• weight and mass
• mass and volume
• temperature and mass
• volume and temperature

Which one of these is a chemical property?

• melting point
• boiling point
• color
• flammability

When a new substance forms as a result of a chemical reaction, what type of change has occurred?

• Chemical Change

• Physical Change

What is the right part of a chemical equation called...

2H_{2 +} O₂ --> 2H₂O

• Reactants

• Yields

• Products

• Chemical Equation