Eighth Grade Matter and Structure

What decides which element an atom is?

• Total mass
• Number of neutrons
• Number of protons
• Number of electrons

A ____ is two or more elements chemically bonded in a fixed ratio.

• compound
• mixture
• isotope
• molecule

Sublimation is when a liquid changes directly into a gas.

• True
• False

Which quantity changes with location?

• Element type
• Number of atoms
• Weight
• Mass

Radiation is the only heat transfer that needs no matter at all.

• True
• False

____ is the number of waves passing a point each second, measured in hertz.

• Speed
• Wavelength
• Amplitude
• Frequency

Which type of wave is sound?

• Longitudinal
• Electromagnetic
• Reflected
• Transverse

In a parallel circuit, if one bulb goes out the others stay lit.

• True
• False

Newton's second law says force equals mass times what?

• Acceleration
• Time
• Velocity
• Distance

A stretched rubber band stores ____ potential energy.

• kinetic
• thermal
• gravitational
• elastic

An endothermic reaction makes its surroundings feel warmer.

• True
• False

What is the unit used to measure force?

• Joules
• Newtons
• Ohms
• Volts

Heat always flows from a warmer object to a ____ one.

• larger
• cooler
• denser
• hotter

Newton's third law forces cancel out because they act on the same object.

• True
• False

A mixture of sand and iron filings can be separated with a:

• Chemical reaction
• Magnet
• Melting
• Battery