Topic 4 review

State the overall charge of the following silicate: Si₆O₁₈^x

The silicate is found in water, state the strongest secondary force that will occur with water

In reverse osmosis, which way will water move?

• from low to high water concentration

• with the concentration gradient

• none of the above

• from low to high salt concentration

Water can be used in electrolysis for the production of which gas?

Hydrogen is used in fuel cells for electricity generation. State the byproduct of this process.

Which ion does not contribute to hard water?

• magnesium

• calcium

• potassium

Electrolysis is occurring on a solution of zinc nitrate. Which will zinc undergo?

• oxidation

• reduction

Calcium production would require what type of electrolysis?

• molten

• aqueous

• not applicable as found uncombined

State one specific type of renewable fuel (not energy source)

The molar enthalpy of butane combustion is -2877 kJ mol^-1. What will be the final temperature of 100 mL of water (21^oC) if 0.02 mol of butane is combusted? C_p = 4.18 (don't include units)