matter

examples of physical change

- freezing of water - melting of ice - the formation of clouds, rain, and fog

Assumptions of Particle Theory of Matter (4)

1. All matter is made up of tiny particles. 2. The particles of matter are always moving. 3. The particles have spaces between them. 4. Adding heat to matter makes the particles move faster.

____________________ solids have disorganized arrangement.

Amorphous

____________________ solids have well defined shape and occur in a highly ordered arrangement.

Crystalline

__________________ is the movement of one particle to another.

Diffusion

_________________________________ models the arrangement and movement of particles in solids, liquids and gases. It explains properties of substances in these different states, and what happens during changes of state.

Kinetic molecular theory or particle theory

is anything that has mass and occupies space.

Matter

is defined as force exerted per unit area.

Pressure

Heat is _____________ during melting and evaporation while heat is _________________ during freezing and condensation.

added, released

Gas particles have _______ spaces between them and are far apart from each other thus, you can compress the particles by applying pressure.

big

Solid particles are ______________ packed

closely

The gas particles moving in a ________________ random motion exert pressure.

constant

Solids have _______________ shape and volume.

definite

Solids particles vibrate in ___________ positions

fixed

Flows and diffuse easily.

gas

Are compressible.

gases

Exert pressure.

gases

Have no definite shape and volume.

gases

Flow and diffuse slowly.

liquids

Have definite volume but no definite shape.

liquids

Since gas particles have ______________________ forces of attraction, they fill their container regardless of its shape and volume.

negligible

Solid particles are arranged in an _______________ manner.

orderly

is the smallest unit of matter.

particle

Liquids do not have a definite shape because particles allow them to move and ____________________ one another and take the shape of its container.

slide past

Liquid particles have ___________ spaces between them.

small

Rigid, compact and incompressible.

solid

Matter exists in three main states, namely: ___________________________

solid, liquid and gas

Solid particles are held by ____________ forces of attraction

strong

Solid particles have very ________ spaces in between

tiny

Liquid particles are held by ___________ intermolecular forces of attraction and allow them to occupy a fixed space thus, its volume is definite.

weak

The __________ intermolecular force of attraction and slide past motion of liquid particles allow them to flow and diffuse at a rate slower than gas.

weak