Question

Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) rice pudding, (b) seawater, (c) magnesium, (d) gasoline.

Short answer

(a) Rice pudding is a heterogeneous mixture, (b) seawater is a homogeneous mixture, (c) magnesium is a pure substance, and (d) gasoline is a homogeneous mixture.

Step-by-step solution

(a) Rice Pudding Classification

Rice pudding is a mixture because it is made up of different components like rice, milk, and sugar. It is a heterogeneous mixture because the composition is not uniform, and the different ingredients can be visibly distinguished.

(b) Seawater Classification

Seawater is a mixture because it contains multiple components, such as water, salt, and other dissolved substances. It is a homogeneous mixture because its composition is uniform throughout, and the different components are not visibly distinguishable.

(c) Magnesium Classification

Magnesium is a pure substance because it is an element made up of only one type of particle.

(d) Gasoline Classification

Gasoline is a mixture because it consists of different hydrocarbon compounds. It is a homogeneous mixture because its composition is uniform, and the different components cannot be distinguished visually.