Unit 1 Review

Front

What is the difference between accuracy and precision?

Back

Accuracy refers to how close a measurement is to the true value, while precision refers to how consistent repeated measurements are.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout.

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.

Front

What are mixtures?

Back

Mixtures are combinations of two or more substances that retain their individual properties and can be separated by physical means.

Front

What is a compound?

Back

A compound is a pure substance formed when two or more elements chemically combine in a fixed ratio.

Front

What is the difference between a mixture and a compound?

Back

A mixture consists of two or more substances that are not chemically combined, while a compound consists of two or more elements that are chemically combined.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical structure.

Front

What is an example of a compound?

Back

Water (H2O) is an example of a compound, as it is made up of hydrogen and oxygen atoms chemically bonded together.

Front

What is the significance of the ratio in compounds?

Back

The ratio of elements in a compound determines its chemical properties and behavior.

Front

What is a colloid?

Back

A colloid is a mixture where tiny particles of one substance are evenly distributed throughout another substance.