Describing Matter. Reviewing MATTER Matter: anything that has mass and takes up space – Mass –...

Describing Matter

Reviewing MATTER

• Matter: anything that has mass and takes up space

– Mass – the amount of matter in a substance– Volume – the amount of space something

occupies

What is a Property?

Property: a characteristic of a substance that can be observed

Physical Properties Physical property: a property that can be observed without changing the identity of the substance.color

size

shape

melting point

boiling point

density

solubility

luster – shininessmalleability - the ability to be hammered into a thin sheet ductility - the ability to be stretched into a wiremagnetism

Chemical Properties

Chemical property - a characteristic of a substance that indicates whether it can undergo a certain chemical change.

Examples:

• flammability

• ability to rust

• reactivity with vinegar

Physical Changes

Physical Change – a change in size, shape, or state of matter

• Physical changes DO NOT change the identity of the substances in the material

• May be reversible

• May be used to separate mixtures

Example: evaporation

Chemical Changes• Chemical change – a change of one

substance in a material into a new substance.

Examples:•fireworks exploding•burning matches•metal rusting•eggs cooking or rotting

Some signs that indicate that a chemical change has taken place:

Chemical Changes

• Formation of gas - bubbles forming

• change in the smell of something – rotting eggs, burning wood, etc.

• rapid production of energy (light, heat, and/or sound) - exploding fireworks

Law of Conservation of Mass

Matter is neither created nor destroyed in a chemical change

The mass of all substances before a chemical change

is equal to

the mass of all the substances remaining after the change.