THE Science 8 Chem Flashcards except some I've already made go check em out

study with "answer with definition"

What happens when you add energy to a material?

You increase the kinetic energy of the particles

What happens during thermal expansion?

The matter expands as it’s temperature increases and the spaces between the particles become larger.

Do the particles change size during thermal expansion?

No, only the spaces between them do

What happens to matter during thermal contraction?

The matter decreases in volume as it’s temperature decreases and energy is removed.

What happens to the spaces between the particles of matter during thermal contraction?

The spaces between the particles become smaller.

What is thermal energy?

The total amount of energy in an object

Does an object have to be hot to have thermal energy?

No

What is heat?

Heat is the transfer of energy from one type of matter to another.

How does heat move?

Heat moves from the high energy object to the low energy object.

What is temperature?

The average energy of an object.

If you were to imagine a crowd at a concert, which term (out of thermal energy, heat, temperature) would be the total excitement?

Thermal energy

If you were to imagine a crowd at a concert, which term (out of thermal energy, heat, temperature) would be the transfer of excitement from one part of the crowd to another?

Heat

If you were to imagine a crowd at a concert, which term (out of thermal energy, heat, temperature) would be the average excitement?

Temperature

What is melting point?

The temperature at which a solid turns to liquid.

What is boiling point?

The temperature at which a liquid turns to gas.

What are the 3 states of matter?

Solid, Liquid, Gas

How does solid turn into liquid?

Melting

How does solid turn into gas?

sublimation

How does gas turn into liquid?

condensation

How does gas turn into solid?

deposition

How does liquid turn into gas?

evaporation

How does liquid turn into solid?

freezing

What are the two types of changes matter can go through?

Physical and Chemical

What is physical change?

A change in which no new substance is produced. The matter will have the same properties.

What changes can result from a physical change?

Size, shape, change in state

What is chemical change?

A change in matter that occurs when substances combine to form a new substance

What are some examples of a chemical change?

frying an egg, baking

How do you know if a new substance is formed?

The properties or characteristics of the new substance(s) will be different from those of the original substance(s).

What are the 5 clues that a chemical change has occurred?

Light/heat given off, bubbles of gas form, colour change, the change is often irreversible, a solid forms in a liquid

Is concrete hardening a chemical or physical change?

chemical

Is snow melting a chemical or physical change?

physical