HMH Unit 5 Nature of Matter Assessment

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties. Examples include sand, salad, and lemonade.

Front

What are physical properties of matter?

Back

Physical properties are characteristics that can be observed or measured without changing the substance's identity. Examples include temperature, color, and shape.

Front

Why is temperature important in the study of matter?

Back

Temperature affects the state of matter and the rate of chemical reactions. Higher temperatures can speed up reactions and change states from solid to liquid or gas.

Front

What is a chemical change?

Back

A chemical change occurs when substances combine or break apart to form new substances. This change is usually not reversible. Example: yeast and sugar in water producing foam.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Example: melting ice.

Front

What is the role of temperature in the preservation of food?

Back

Lower temperatures slow down the reactions that cause food to spoil, helping to preserve its freshness.

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. Atoms combine to form molecules.

Front

What is a solute?

Back

A solute is a substance that is dissolved in a solution. For example, sugar is a solute when dissolved in water.

Front

What is a solution?

Back

A solution is a homogeneous mixture of two or more substances, where one substance (the solute) is dissolved in another (the solvent). Example: saltwater.

Front

What is the difference between a physical and chemical change?

Back

A physical change affects the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.