Chemistry Review

The atomic number tells you what?

• number of electrons

• number of protons

• number of neutrons

• both electrons and protons in an atom.

Which is the correct formula for:

one carbon (C)

two oxygen (O)

• CO₂

• CO

• C₂O

• 2CO

How many elements are in H₂O?

• 1

• 2

• 3

• 4

The number at the top of each square on the periodic table is the ...

• atomic number

• atomic mass

• Chemical Symbol

• Element Name

What kind of properties can only be observed when a substance changes into a different substance?

• physical properties

• chemical properties

• liquid properties

• real properties

Which of the following is a sign that a chemical reaction has occurred?

• change in shape

• melting

• formation of a gas

• dissolving

Is being able to melt physical or chemical

• Physical

• Chemical

Is making a cake physical or chemical

• Physical

• Chemical

Is burning wood a chemical or physical change?

• Physical

• Chemical

Is hammering wood together to build a house a chemical or physical change?

• Physical

• Chemical