Unit Test — Unit test

Question 1

Which statement defines specific heat capacity for a given sample?

Revolt · Accepted Answer

the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure

Question 2

Reactant P contains 50 J of energy, and reactant Q contains 35.3 J of energy. The reactants combine to form product PQ, which contains 104 J of energy. What is the energy transformation?

Revolt · Accepted Answer

Energy is absorbed because the product has more energy than the reactants have.

Question 3

The combustion of glucose, C6 H12 O6 (s), produces carbon dioxide, CO2 (g), and water, H2 O(g), according to the equation below.The enthalpy of the reaction is –2,840 kJ. What is the heat of combustion, per mole, of glucose?

Revolt · Accepted Answer

–2,840 kJ/mol

Question 4

When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe?

Revolt · Accepted Answer

endothermic

Question 5

Which defines the average kinetic energy of a system’s particles?

Revolt · Accepted Answer

temperature

Question 6

Which statement best explains the change that occurs when gas particles move more slowly?

Revolt · Accepted Answer

The temperature decreases because the average kinetic energy decreases.

Question 7

A copper rod that has a mass of 200.0 g has an initial temperature of 20.0°C and is heated to 40.0°C. If 1,540 J of heat are needed to heat the rod, what is the specific heat of copper?Use .

Revolt · Accepted Answer

0.385 J/(gi°C)

Unit Test — Unit test Answers

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