Question

Classify the following materials as homogeneous and heterogeneous mixtures.
(soda-water, wood, air, soil, petrol and water mixture, alcohol and water mixture, chalk and water mixture, sand and water mixture, sugar and water mixture, pumice stone, smoke, salt and water mixture, cough syrup, gun powder).

Answer 1

Homogeneous $\to$ soda-water, wood, air, alcohol and water mixture, sugar and water mixture, salt and water mixture, cough syrup.
Heterogeneous $\to$ soil, petrol and water mixture, chalk and water mixture, sand and water mixture, pumice stone, smoke, gun powder.