8th Grade Unit #4 Changes in Matter Final Assessment

Front

What is a pure substance?

Back

A pure substance is made up of only one type of particle, which can be an element or a compound.

Front

Which of the following is a pure substance: salad dressing, fruit gelatin, whipped cream, or water?

Back

Water is a pure substance.

Front

How does temperature affect chemical reactions?

Back

Reactions happen slower when it is cold.

Front

What occurs when a chemical change happens?

Back

A new substance is formed.

Front

What is the definition of a chemical change?

Back

A process where one or more substances are transformed into new substances with different properties.

Front

What is the definition of a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What does the symbol 'X' represent in the periodic table?

Back

X represents an element.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Rust forming on iron is an example of a chemical change.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond.