Understanding Mixtures and Their Separation

What is a mixture?

• A chemical compound

• A combination of substances with no chemical change

• A single element

• A solution with a chemical reaction

Which of the following is an example of a mixture?

• Pure water

• Table salt

• Salad

• Gold

Why is air considered a mixture?

• It contains multiple gases like oxygen and nitrogen

• It is a liquid

• It is a single element

• It is a compound

Which method is suitable for separating large particles in a mixture?

• Sieving

• Using a magnet

• Picking by hand

• Dissolving

Which method is used to separate a mixture of pebbles and rice?

• Dissolving

• Sieving

• Using a magnet

• Picking by hand

What is a limitation of the sieving method?

• It requires a magnet

• It cannot separate substances of the same size

• It is only useful for liquids

• It cannot separate substances of different sizes

How can iron powder be separated from flour?

• By sieving

• By using a magnet

• By picking by hand

• By dissolving in water

What is the purpose of hairs inside our noses?

• To help in breathing

• To act as a filter for dust

• To enhance smell

• To produce mucus

What is the main characteristic of a mixture?

• It involves a chemical reaction

• It is a pure substance

• It is always a liquid

• It consists of substances combined without chemical change

Which of the following is NOT a method to separate mixtures?

• Boiling

• Using a magnet

• Sieving

• Picking by hand