Matter and Energy Unit Test part 1

Which sample of matter has the greatest distance between molecules at STP?

• 1) N₂(g)

• 2) NH₃(aq)

• 3) C₆H₁₄(l)

• C₆H₁₂O₆(s)

The arrangement of particles is most ordered in a sample of

• NaCl(aq)

• NaCl(l)

• NaCl(g)

• NaCl(s)

Which phase change is an exothermic process?

• CO₂(s) --> CO₂(g)

• NH₃(g) --> NH₃(l)

• Cu(s) --> Cu(l)

• Hg(l) --> Hg(g)

Which form of energy is converted to thermal energy when propane burns in air?

• electromagnetic

• nuclear

• electrical

• chemical

Two grams of potassium chloride are completely dissolved in a sample of water in a beaker. This

solution is classified as

• an element

• a heterogeneous mixture

• a homogeneous mixture

• a compound

Which is a chemical property of water?

• It freezes.

• It decomposes.

• It evaporates.

• It boils.

Which term identifies a form of energy?

• combustion

• exothermic

• thermal

• electrolytic

Which sample of water contains particles having the highest average kinetic energy?

• 25 mL of water at 95°C

• 45 mL of water at 75°C

• 75 mL of water at 75°C

• 95 mL of water at 25°C

Which temperature is equal to 120. K?

• –153°C

• –120.°C

• +293°C

• +393°C

Which quantity is equal to 50 kilojoules?

• 0.05 J

• 500 J

• 5 × 10³ J

• 5 × 10⁴ J