6th Science Topic 2 Review

What is pressure?

• The pressure of a gas is the temperature of its particles over the surface area.
• The pressure of a gas is the force of its outward push (in Newtons) over an area (in square meters) of the walls of the container.
• The pressure of a gas is the amount of space an object takes up.
• The pressure of a gas is the size of the particles in a given state of matter.

How can you increase a substance’s thermal energy?

• You can increase the thermal energy of a substance by changing its molecular structure.
• You can increase the thermal energy of a substance by cooling it down.
• You can increase the thermal energy of a substance by heating it.
• You can increase the thermal energy of a substance by vaporizing the substance.

What causes solids to have a definite shape and definite volume?

• The particles that make up a solid are separated by air.
• The particles that make up a solid are packed very closely together.
• The particles that make up a solid are stacked in a vertical line.
• The particles that make up a solid are bouncing around past one another.

How are the particles in a liquid arranged?

• The particles in a liquid are fixed in place and vibrate in place.
• The particles in a liquid are not fixed in place and can move around one another.
• The particles in a liquid are free flowing and arranged in a crystal structure.
• The particles in a liquid cannot move around one another and melt at a constant temperature.

Why can liquids flow from one place to another?

• The high viscosity allows a liquid to flow from place to place.
• The surface tension allows a liquid to flow from place to place.
• Melting at a distinct temperature allows a liquid to flow from place to place.
• Free moving particles allow a liquid to flow from place to place.

How are the particles in a gas arranged?

• The particles in a gas are widely spaced and collide with one another as they move around.
• The particles are free moving and allow it to flow from place to place.
• The particles are closely locked in position such that they cannot move around one another on their own and only vibrate in place.
• The particles can be filled slightly above the rim without spilling over because the molecules attract one another strongly.

What is the change in state from a liquid to a solid called?

• Melting
• Vaporization
• Sublimation
• Freezing

What is the change of a liquid to a gas called?

• Melting
• Vaporization
• Sublimation
• Freezing

When does condensation occur?

• Condensation occurs when atmospheric pressure affects how easily a liquid changes to a gas.
• Condensation occurs when particles in a gas lose enough thermal energy to change state.
• Condensation occurs when a substance's thermal energy decreases, its particles slow down, and its temperature decreases.
• Condensation occurs when a liquid boils.

What did French scientist Jacques Charles discover about the relationship between the temperature and volume of a gas?

• French scientist Jacques Charles discovered that when the temperature of a gas is pressurized, its volume expands.
• French scientist Jacques Charles discovered that when the temperature of a gas at constant pressure is increased, its volume increases. He also discovered that when the temperature of a gas at constant pressure is decreased, its volume decreases.
• French scientist Jacques Charles discovered that when the temperature of a gas is fixed in place, its volume stays the same.
• French scientist Jacques Charles discovered that when the temperature of a gas changes state of matter, its volume stays as a gas.