Exploring States of Matter Mixtures

Which of the following is NOT a state of matter?

• Solid

• Liquid

• Gas

• Light

Answer explanation

Light is not a state of matter; it is a form of electromagnetic radiation. The three primary states of matter are solid, liquid, and gas, which describe the physical forms substances can take.

What is the process called when a solid changes directly into a gas?

• Condensation

• Sublimation

• Melting

• Freezing

Answer explanation

The process when a solid changes directly into a gas is called sublimation. This occurs without passing through the liquid phase, unlike melting or freezing, which involve changes between solid and liquid states.

Tags

NGSS.MS-PS1-4

Which of the following is a homogeneous mixture?

• Salad

• Air

• Sand and iron filings

• Oil and water

Answer explanation

Air is a homogeneous mixture because its composition is uniform throughout, consisting of various gases mixed evenly. In contrast, salad, sand and iron filings, and oil and water are heterogeneous mixtures.

Which method would best separate a mixture of sand and salt?

• Filtration followed by evaporation

• Distillation

• Chromatography

• Magnetism

Answer explanation

Filtration separates solid particles (sand) from liquids (saltwater). After filtration, evaporation removes the water, leaving behind the salt. This method effectively separates sand and salt, making it the best choice.

Which state of matter has a definite shape and a definite volume?

• Solid

• Liquid

• Gas

• Plasma

Answer explanation

A solid has a definite shape and a definite volume, unlike liquids and gases which take the shape of their container and can change volume. Therefore, the correct answer is solid.

Which of the following is an example of a heterogeneous mixture?

• Salt water

• Vinegar

• Trail mix

• Air

Answer explanation

Trail mix is a heterogeneous mixture because it consists of different components like nuts, dried fruits, and chocolate, which can be seen and separated. In contrast, salt water, vinegar, and air are homogeneous mixtures.

What happens to the particles of a substance when it melts?

• They move closer together

• They stop moving

• They move farther apart

• They become charged

Tags

NGSS.MS-PS1-4

Which method is best for separating a mixture of colored inks?

• Filtration

• Chromatography

• Decantation

• Sieving

Which of the following is NOT a property of gases?

• They have a definite shape

• They fill their container

• They can be compressed

• Their particles move freely

What is the formula for density?