Sergey Bylikin, Gary Horner and, Brian Murphy Solutions for Chapter: Energy, Exercise 1: Questions

The conversion of heat to electricity is usually more efficient than that of electricity to heat. Decide whether the given statement is true or false.

The final conversion step in most commercial power plants is work (kinetic energy) to electricity. Decide whether the given statement is true or false.

Nuclear energy is a renewable resource. Decide whether the given statement is true or false.

Green energy resources are sustainable, renewable, and produce low pollution. Decide whether the given statement is true or false.

Ethanol is a fuel produced from plant products by fermentation. It has a density of $789 \mathrm{g} {\mathrm{dm}}^{-3}$ and its enthalpy of combustion is $-1367 \mathrm{kJ} {\mathrm{mol}}^{-1}$. Calculate the energy density for ethanol in $\mathrm{kJ} {\mathrm{dm}}^{-3}$. (Give the value approximated to the nearest integer)

Ethanol is a fuel produced from plant products by fermentation. It has a density of $789 \mathrm{g} {\mathrm{dm}}^{-3}$ and its enthalpy of combustion is $-1367 \mathrm{kJ} {\mathrm{mol}}^{-1}$. Calculate the specific energy for ethanol. (Give the value approximated to a single decimal place)

Ethanol is a fuel produced from plant products by fermentation. It has a density of $789 \mathrm{g} {\mathrm{dm}}^{-3}$ and its enthalpy of combustion is $-1367 \mathrm{kJ} {\mathrm{mol}}^{-1}$. Write a balanced equation for the combustion of ethanol and state the amount, in $\mathrm{mol}$, of carbon dioxide produced per mole of ethanol burned.

Ethanol is a fuel produced from plant products by fermentation. It has a density of $789 \mathrm{g} {\mathrm{dm}}^{-3}$ and its enthalpy of combustion is $-1367 \mathrm{kJ} {\mathrm{mol}}^{-1}$. Explain why this method is still considered "green" chemistry even though it produces carbon dioxide in the combustion reaction.