The Particulate Nature of Matter

Which statement best describes the fact that gases can be compressed?

• The particles in a gas do not have a fixed volume.

• The particles in a gas are very far apart.

• The particles in a gas have no force of attraction (bonds) between them.

• The particles in a gas are constantly moving very rapidly.

Which statement(s) best describes the fact that a liquid flows?

• The particles in a liquid have weak bonds between them.

• The particles in a liquid have no fixed position.

• The particles in a liquid are close and touching.

• The particles in a liquid are moving slowly over each other.

When a liquid evaporates the temperature of the liquid decreases. Which statement(s) best describes why this happens?

• Some closely packed particles at the surface of the liquid break the bonds which are keeping them close to neighbouring particles.

• Breaking bonds is an endothermic process (requires energy).

• When particles enter the gaseous state they take their (kinetic) energy with them.

• Particles at the surface of the liquid make bonds with gaseous particles above the surface of the liquid.

• Making bonds is an exothermic process (releases energy).

Tags

NGSS.MS-PS1-4

The boiling points of four different liquids are given below. The particles in the liquids have approximately the same mass. Which liquid has the weakest bonds between its particles?

• Liquid A boils at 20°C

• Liquid B boils at 30°C

• Liquid C boils at 40°C

• Liquid D boils at 50°C

Tags

NGSS.HS-PS1-3

The three states of matter are represented by diagrams X, Y and Z. Which change occurs during condensation?

• X to Y

• X to Z

• Y to X

• Z to X

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following substances did Robert Brown observed upon forming the concept of Brownian motion?

• Talc powder suspended in water
• Pollen grains suspended in water
• Talc powder suspended in air
• Pollen grains suspended in air

Particles of all matter are in constant random motion.

• True
• False

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

It is the densest among all state of matter

• Solid
• Liquid
• Gas
• Plasma

A change from gas to liquid involves a _________ in temperature

• increase
• decrease

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The particles of liquids ________________

• vibrate about their fixed postions

• are able to slide over each other

• move about freely at high speeds and in random direction

• do not move

Tags

NGSS.MS-PS1-4