JAMB Past Questions and Answers - Page 1160

To calculate the mass of a substance, we can use the formula:
Mass = Volume x Density
Given the volume of ethanol is 500 mL and the density of ethanol is 0.789 g/mL, we can plug the values into the formula:
Mass = 500 mL x 0.789 g/mL = 394.5 g

Aluminum is not hygroscopic. It does not have a strong affinity for water vapor and does not absorb moisture from the air.

A colloid is a type of mixture where one substance is dispersed in another in the form of tiny particles that do not settle out. In milk, fat globules are dispersed in water, forming a colloid.

Water is often referred to as the "universal solvent" because of its ability to dissolve a wide range of substances. This unique property is mainly due to water's polar nature. Water molecules have a slightly positive charge on the hydrogen atoms and a slightly negative charge on the oxygen atom, making it a polar molecule. This polarity allows water molecules to interact with and surround other polar and ionic substances, breaking them down and forming solutions.

The conversion of benzene to toluene involves an electrophilic aromatic substitution reaction. In this reaction, a methyl group (CH3) is added to the benzene ring, replacing one of the hydrogen atoms, and the reaction proceeds through electrophilic attack on the benzene ring.