Unit 3 Changes in Matter Review

Front

What do metals tend to do in ionic bonds?

Back

Metals tend to lose valence electrons in ionic bonds.

Front

What type of change occurs when food is digested in the stomach?

Back

Chemical Change

Front

What are elements?

Back

Elements are substances that cannot be broken down into simpler substances by chemical means. They are the building blocks of all matter.

Front

What happens when coffee is poured into a cup of ice?

Back

The ice melting is a physical change because the water may be frozen again.

Front

What might the pH value of milk, a very weak acid, be?

Back

6.5

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances.

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 is the difference between a compound and an element?

Back

A compound is made up of two or more elements that are chemically combined, while an element is a pure substance that cannot be broken down into simpler substances.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons are the electrons in the outermost shell of an atom and are involved in forming bonds with other atoms.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.