Understanding Mixtures and Substances

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes, such as heat or light.

Front

What is a sign of a chemical change?

Back

Change in temperature is a sign of a chemical change.

Front

What is density?

Back

Density is the mass of a substance divided by its volume, indicating how much matter is packed into a given space.

Front

What is the method to measure density?

Back

Use a balance to measure mass and a graduated cylinder to measure volume.

Front

What property is independent of the amount of the sample?

Back

Density is independent of the amount of the sample.

Front

What are elements in the same group of the periodic table similar?

Back

They have the same number of valence electrons.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture where the components are not uniformly distributed, such as a salad.

Front

What is the difference between a substance and a mixture?

Back

A substance has a fixed composition and distinct properties, while a mixture contains two or more substances that can vary in composition.