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Science: Middle School: Grades 6, 7 and 8 Quiz - Particles and Energy (Questions)

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Matter (that's solids, liquids or gasses) is all made up from particles. Electrons, neutrinos and photons are all subatomic particles. A particle is something that is so tiny we can't see it. Scientists are continuously investigating matter and the particles from which matter is made. Atoms are so tiny you wouldn't even be able to see them with a good microscope - you would need a very special microscope. But atoms aren't the smallest particles - electrons, protons and neutrons are even tinier. And just wait until you learn about quarks!

What are light particles known as?

[ ]	Molecules
[ ]	Electrons
[ ]	Photons
[ ]	Neutrons

A vibrating object causes air particles to vibrate. These air particles cause other air particles to vibrate, which cause more air particles to vibrate. What is this movement of energy called?

[ ]	Sound waves
[ ]	Gravity
[ ]	Force
[ ]	Tidal waves

Particles in which state of matter are tightly packed?

[ ]	Solid
[ ]	Liquid
[ ]	Gas
[ ]	All of the above

Which of the following is true of the particles of a liquid?

[ ]	The particles of a liquid do not move
[ ]	They move very fast, much faster than the particles of a gas
[ ]	They are more tightly-packed than the particles of a solid
[ ]	They are not as tightly packed as a solid's particles, but do not move as freely as those of a gas

Which state of matter has particles which move very fast?

[ ]	Solid
[ ]	Liquid
[ ]	Gas
[ ]	Solids and liquids

Sound waves can cause which of these to vibrate?

[ ]	Particles of a solid
[ ]	Particles of a liquid
[ ]	Particles of a gas
[ ]	All of the above

What takes place when particles gain enough energy to escape the surface of a liquid?

[ ]	Condensation
[ ]	Evaporation
[ ]	Freezing
[ ]	Melting

Increasing the temperature causes particles to gain what?

[ ]	Speed
[ ]	Energy
[ ]	Mass
[ ]	Speed and energy

Lowering the temperature of a substance causes its particles to do what?

[ ]	Speed up
[ ]	Maintain the same speed
[ ]	Slow down
[ ]	Stop moving

10.

Sound waves travel fastest through which material?

[ ]	Solids
[ ]	Liquids
[ ]	Gases
[ ]	Sound waves don't change their speed

Science: Middle School: Grades 6, 7 and 8 Quiz - Particles and Energy (Answers)

What are light particles known as?

[ ]	Molecules
[ ]	Electrons
[x]	Photons
[ ]	Neutrons

The clue is in the name! 'Photo' means 'related to light'

A vibrating object causes air particles to vibrate. These air particles cause other air particles to vibrate, which cause more air particles to vibrate. What is this movement of energy called?

[x]	Sound waves
[ ]	Gravity
[ ]	Force
[ ]	Tidal waves

Sound is a vibration in the air

Particles in which state of matter are tightly packed?

[x]	Solid
[ ]	Liquid
[ ]	Gas
[ ]	All of the above

When a substance is solid, its particles do not move around much. Because their particles are so tightly packed, solids keep their shape unless forced to change (i.e. by cutting or squashing)

Which of the following is true of the particles of a liquid?

[ ]	The particles of a liquid do not move
[ ]	They move very fast, much faster than the particles of a gas
[ ]	They are more tightly-packed than the particles of a solid
[x]	They are not as tightly packed as a solid's particles, but do not move as freely as those of a gas

Liquids are halfway between a solid and a gas

Which state of matter has particles which move very fast?

[ ]	Solid
[ ]	Liquid
[x]	Gas
[ ]	Solids and liquids

The particles in gasses move much faster than those in a liquid and those of a solid hardly move at all

Sound waves can cause which of these to vibrate?

[ ]	Particles of a solid
[ ]	Particles of a liquid
[ ]	Particles of a gas
[x]	All of the above

This is why sound can pass through almost any material

What takes place when particles gain enough energy to escape the surface of a liquid?

[ ]	Condensation
[x]	Evaporation
[ ]	Freezing
[ ]	Melting

If you heat a liquid up you are giving it energy and it might evaporate

Increasing the temperature causes particles to gain what?

[ ]	Speed
[ ]	Energy
[ ]	Mass
[x]	Speed and energy

The energy speeds up the particles so they are gaining both speed and energy

Lowering the temperature of a substance causes its particles to do what?

[ ]	Speed up
[ ]	Maintain the same speed
[x]	Slow down
[ ]	Stop moving

Lowering the temperature reduces the amount of energy

10.

Sound waves travel fastest through which material?

[x]	Solids
[ ]	Liquids
[ ]	Gases
[ ]	Sound waves don't change their speed

Vibrations can be passed along more quickly when particles are closer together, as they are in a solid