Review for First Test

Which of the following describes liquid particles

• do not move

• expand to fill the container they are placed in

• highest amount of movement

• bounce around

Gold is a .....

• pure substance

• compound

• heterogenous mixture

• homogeneous mixture

atomic number is equal to...

• number of electrons

• number of protons plus neutrons

• number of protons

• number of electrons plus neutrons

Potassium has an atomic number of 18 and an atomic mass of 39. How many protons and neutrons are in the atom?

• 19 protons and 20 neutrons

• 19 protons and 19 neutrons

• It is impossible to tell

• 20 protons and 19 neutrons

If an element has 53 protons and 74 neutrons, that element is...

• Hydrogen

• Not a real element

• Calcium

• Iodine

Elements with properties similar to another element are...

• in the same group

• in the same period

• have the same atomic mass

• have the same density

The periodic table is organized b

• increasing atomic number

• increasing number of neutrons

• increasing number of atomic mass

• decreasing number of atomic mass

What substance below is made of more than one element?

• carbon

• salt

• gold

• sodium

Which substance below is a compound?

• He

• O3

• H2O

• Gold

Mixtures are...

• chemically combined

• physically combined (not chemically)

• happen after a chemical reaction

• made of a compound