Week 1 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

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

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

• True

• False

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

Flammability is a ________ property.

• physical

• chemical

• private

• illegal

Tags

NGSS.MS-PS1-2

A digital scale is used to measure which physical property?

• speed

• volume

• mass

• weight

Which physical property explains why copper is often used in electric wiring?

• density

• mass

• reactivity

• conductivity

True or False: If you take an object from Earth and place it on the moon, its weight will change.

• True

• False

Which are physical properties of matter?

• mass

• conductivity

• volume

• boiling/melting point

• all of these