PM2 Review Questions 2023

Front

What happens when different liquids are mixed and left undisturbed?

Back

The liquids may separate into layers based on their densities, with the denser liquids at the bottom.

Front

What is the best method to separate salt from a mixture of water, iron filings, sand, and salt?

Back

Dissolve the salt in water, then filter the mixture to separate the sand and iron filings from the saltwater solution.

Front

What is an independent variable in an experiment?

Back

An independent variable is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable.

Front

What is a dependent variable in an experiment?

Back

A dependent variable is the factor that is measured or observed in an experiment, which is affected by changes in the independent variable.

Front

What are reversible physical changes?

Back

Reversible physical changes are changes that can be reversed, such as melting ice back into water or freezing water into ice.

Front

What is the definition of matter?

Back

Matter is anything that has mass and takes up space.

Front

How do gas particles behave in a container?

Back

Gas particles are loosely packed and move freely, filling the entire volume of the container.

Front

What is the significance of a graph in an experiment?

Back

A graph visually represents data, making it easier to identify trends and relationships between variables.

Front

What is filtration?

Back

Filtration is a process used to separate solids from liquids or gases using a filter that allows only the fluid to pass through.

Front

What is the role of temperature in dissolving substances?

Back

Higher temperatures generally increase the rate at which substances dissolve in liquids.