chem

The SI unit of energy is the

• watt.

• gram.

• joule.

• calorie.

A watt is

• 1 s/cal

• 1 cal/s

• 1 joule/s.

• 1 s/joule.

How many joules of energy will a stock tank heater rated at 400 watts use in a 48 hour period?

• 400 × 48 × 3600

• 
  400

• 400 × 48 × 60

• 400 × 3600

All of the following examples are classified as potential energy EXCEPT

• energy in nuclear particles.

• energy of a moving object.

• energy in chemical bonds.

• energy stored by position.

Which of the following situations would be an example of kinetic energy?

• a nuclear explosion

• a tank of gasoline

• a compressed spring

• a batter waiting for the ball to be pitched

Which of the following is a product of photosynthesis?

• H₂O

• CO₂

• O₂

• H₂S

Burning 1.000 mol of methane in oxygen to form carbon dioxide and water produces 803 kJ of energy. How much energy is produced when 4.000 mol of methane is burned?

• 1205 kJ

• 3212 kJ

• 1606 kJ

• 358.0 kJ

Burning one mole of propane according to the following reaction:
C₃H₈(g) + 5 O₂(g) → 3 CO₂ + 4 H₂O
liberates 526 kcal of energy. If all of the coefficients are tripled, how much energy will be released?

• 526 kcal

• 175.3 kcal

• 1052 kcal

• 1578 kcal

Which process is exothermic?

• ice cream melting

• splitting water into hydrogen and oxygen gases

• cooking an egg

• a lake freezing

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Which of the following is a true statement about the process of freezing water?

• The process is endothermic.

• The process is exothermic.

• No energy is involved, because freezing occurs at the same temperature (0 ∘C∘C) as melting.

• Water molecules absorb energy in the process.