Bromothymol blue is an acid-base indicator that is blue in base and yellow in acid:

$\left(\mathrm{Yellow}\right) \mathrm{HB}\rightleftharpoons {\mathrm{H}}^{+}+{\mathrm{B}}^{-} \left(\mathrm{Blue}\right)$

 Deduce which of the two forms of the indicator has the higher degree of conjugation. Explain it in terms of the wavelength of light absorbed and molecular structure of an organic indicator.

The energy conversion in an automobile is to convert heat to kinetic energy. Decide whether the given statement is true or false.

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.

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.