Mixtures and Solutions Quiz

What is the difference between a homogeneous and a heterogeneous mixture?

• Homogeneous mixtures have visible parts; heterogeneous mixtures look the same throughout.

• Homogeneous mixtures look the same throughout; heterogeneous mixtures have visible parts.

• Both mixtures look the same throughout.

• Both mixtures have visible parts.

Is lemonade a homogeneous or heterogeneous mixture?

• Homogeneous, because it looks uniform throughout.

• Heterogeneous, because it has visible particles.

• Neither, because it is not a mixture.

• It depends on the amount of sugar added.

Why is sand and iron filings considered a heterogeneous mixture?

• Because the iron dissolves in sand.

• Because both substances look the same.

• Because you can see different substances in the mixture.

• Because sand and iron combine chemically.

What does physical separation mean?

• Separating substances using chemical reactions.

• Separating substances without changing their properties.

• Mixing different substances together.

• Melting substances to form a new material.

Which method would be best to separate iron nails from a mixture of sand and nails?

• Decantation

• Evaporation

• Magnetism

• Distillation

You have a mixture of salt and water. Which separation technique should you use to get back the salt?

• Filtration

• Evaporation

• Magnetism

• Decantation

What is decantation, and how does it work?

• It uses a magnet to separate substances.

• It involves letting the heavier liquid settle before pouring out the lighter liquid.

• It evaporates water to leave behind dissolved solids.

• It filters out solid particles from a liquid.

How does evaporation help in separating dissolved solids from liquids?

• The liquid is removed by boiling, leaving the solid behind.

• The solid turns into a gas and disappears.

• The solid is filtered out of the liquid.

• A magnet pulls the solid away from the liquid.

Why is distillation a useful method for separating mixtures?

• It removes solid impurities by filtering them out.

• It separates liquids based on different boiling points.

• It separates substances using a magnet.

• It involves hand-picking solid particles.

What is the role of magnetism in separating mixtures?

• It helps dissolve metals in water.

• It allows solid particles to settle at the bottom.

• It pulls magnetic substances away from non-magnetic ones.

• It evaporates water, leaving behind solids.