Q: A 150 g baseball is thrown at a speed of 39 m/s. What is its kinetic energy? Use $$KE = \frac{1}{2}mv^2$.

$$1.1 \times 10^2$\ \mathrm{J}$$

Question 1

A 150 g baseball is thrown at a speed of 39 m/s. What is its kinetic energy? Use $$KE = \frac{1}{2}mv^2$.

Accepted Answer

$$1.1 	imes 10^2$\ \mathrm{J}$$

Question 2

A sample of copper absorbs $$43.6\ \mathrm{kJ} of $$heat, resulting in a temperature rise of $$75.0\ ^\circ\mathrm{C}. If $$the specific heat capacity of copper is $$0.385\ \mathrm{J}\ \mathrm{g}^{-1}\ ^\circ\mathrm{C}^{-1}$$, what is the mass (in kg) of the copper sample? Use $$q = mC\Delta T.$$

Accepted Answer

$$1.51\ \mathrm{kg}$$

Question 3

Which of the following processes is endothermic?

Accepted Answer

The vaporization of rubbing alcohol

Question 4

A balloon is inflated from $$0.0100\ \mathrm{L} to$$ $$0.500\ \mathrm{L}$$ against an external pressure of $$10.00\ \mathrm{bar}. $$How much work is done in joules? (100 J = 1 L bar)

Accepted Answer

$$-490\ \mathrm{J}$$

Question 5

Which of the following statements about state functions is TRUE?

Accepted Answer

All of the above are true.

Question 6

Calculate the amount of heat (in kJ) required to raise the temperature of a $$79.0\ \mathrm{g}$$ sample of ethanol from $$298.0\ \mathrm{K} to$$ $$385.0\ \mathrm{K}. $$The specific heat capacity of ethanol is $$2.42\ \mathrm{J}\ \mathrm{g}^{-1}\ ^\circ\mathrm{C}^{-1}. $$Use $$q = mC\Delta T.$$

Accepted Answer

$$16.6\ \mathrm{kJ}$$

Question 7

A student mixes two aqueous solutions at room temperature in a coffee cup calorimeter. The temperature of the resulting solution falls below room temperature. Which statement is TRUE?

Accepted Answer

None of the above statements is true.

Question 8

Which of the following is NOT a standard state?

Accepted Answer

A liquid at $$25^\circ\mathrm{F}$$

Question 9

A $$6.55\ \mathrm{g}$$ sample of aniline ($$\mathrm{C}_6\mathrm{H}_5\mathrm{NH}_2$$, molar mass $$= 93.13\ \mathrm{g\ mol}^{-1}) $$was combusted in a bomb calorimeter. If the temperature rose by $$32.9^\circ\mathrm{C}$$ and $$\Delta_r U = -3.20 	imes 10^3$\ \mathrm{kJ\ mol}^{-1}$$, what is the heat capacity of the calorimeter?

Accepted Answer

$$6.84\ \mathrm{kJ}$$

Question 10

Which of the following statements about enthalpy is TRUE?

Accepted Answer

Enthalpy is a state function.

Question 11

Calculate the enthalpy change ($$\Delta H) in kJ $$for a chemical reaction that raises the temperature of $$250.0\ \mathrm{mL} of $$solution (density $$= 1.25\ \mathrm{g\ mL}^{-1}$$, specific heat $$= 3.74\ \mathrm{J\ g}^{-1}\ \mathrm{K}^{-1}) by$$ $$3.33^\circ\mathrm{C}. $$Use $$q = mC\Delta T.$$

Accepted Answer

$$-3.89\ \mathrm{kJ}$$

Question 12

Which of the following is the greatest source of energy worldwide?

Accepted Answer

Petroleum

Question 13

A $$100.0\ \mathrm{mL}$$ sample of $$0.300\ \mathrm{mol\ L}^{-1}$$ NaOH is mixed with a $$100.0\ \mathrm{mL}$$ sample of $$0.300\ \mathrm{mol\ L}^{-1}$$ HNO$$_3 in a $$coffee cup calorimeter. If both solutions were initially at $$35.00^\circ\mathrm{C}$$ and the temperature of the resulting solution was $$37.00^\circ\mathrm{C}$$, what is $$\Delta H^\circ (in kJ $$mol$$^{-1}) $$for the neutralization reaction? Assume the density and heat capacity of the solution are the same as water.

Accepted Answer

$$-55.7\ \mathrm{kJ\ mol}^{-1}$$

Question 14

Which of the following is a greenhouse gas?

Accepted Answer

CO$$_2$$

Question 15

Which of the following is NOT a major contributor to energy consumption?

Accepted Answer

Atmospheric

Question 16

A $$21.8\ \mathrm{g}$$ sample of ethanol ($$\mathrm{C}_2\mathrm{H}_5\mathrm{OH}$$, molar mass $$= 46.07\ \mathrm{g\ mol}^{-1}) is $$burned in a bomb calorimeter. If the temperature rises from $$25.0^\circ\mathrm{C} to$$ $$62.3^\circ\mathrm{C}$$ and $$\Delta_r U = -1235\ \mathrm{kJ\ mol}^{-1}$$, what is the heat capacity of the calorimeter?

Accepted Answer

$$15.7\ \mathrm{kJ\ ^\circ C}^{-1}$$

Question 17

Which of the following reactions is exothermic?

Accepted Answer

The condensation of water

Question 18

Which of the following is the correct definition of specific heat capacity?

Accepted Answer

The quantity of heat required to raise the temperature of 1 g of a substance by $$1^\circ\mathrm{C}$$

Question 19

Which of the following is a non-renewable energy source?

Accepted Answer

Coal

Question 20

Which of the following is the correct unit for heat capacity?

Accepted Answer

$$\mathrm{J}\ ^\circ\mathrm{C}^{-1}$$

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