8th Grade Science

What happens to an iron nail when it rusts?

• Oxygen in the air dissolves part of the iron

• The nail becomes lighter because the rust heats the iron

• The nail becomes heavier because rust weighs more than iron

• Iron reacts with oxygen in the air, creating iron oxide on the surface of the nail

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which formula listed below correctly finds density?

• D=v/m

• D=m/v

• D=g/v³

• D=g/v

Mass is conserved in both physical and chemical changes.

• False

• True

Tags

NGSS.MS-PS1-5

Change of state is a physical change.

• True

• False

Tags

NGSS.MS-PS1-4

Adding an electron to an atom results in an isotope.

• True

• False

The atomic number is the number of protons in an atom of an element.

• True

• False

Tags

NGSS.MS-PS1-1

The positively charged center of the atom is called the _______

• electron cloud

• neutron

• nucleus

• compound

Tags

NGSS.MS-PS1-1

The negative particle in an atom is the ____________________

• ion

• nucleus

• neutron

• electron

Tags

NGSS.MS-PS1-1

Which particles make up the nucleus?

• electron and proton

• proton and positron

• neutron and proton

• electron and neutron

Tags

NGSS.MS-PS1-1

The freezing of water is a chemical change.

• False

• True

Tags

NGSS.MS-PS1-4