Types of Matter

Define physical change?

No new substance formed: reversible Ex: Ice melting → water

Includes change in size, shape, state, solution

Define Chemical Change?

New substance formed Ex: H2 + O2 → H2O

Change in colour, odour, temperature or light given off, bubbles of a new gas, a new solid

Whats an element?

Pure substance made of one type of atom Ex: Helium (He), Oxygen (O2)

Whats a compound?

Pure substance is made of identical molecules that contain two or more different atoms chemically bonded together Ex: 2 hydrogens atoms + 1 oxygen atom = H2O

Whats a solution?

A homogeneous mixture that looks the same everywhere and you can’t see see the different parts. Ex: 2 hydrogens atoms + 1 oxygen atom = H2O Ex: salt and water mixed } there for you can’t see different parts

Whats a mehancial mixture?

Heterogenous mixture: looks different in different parts you can see the different parts easily Ex: Granola bar

What are physical properties?

Are properties that can be observed Ex: state, colour, lustre. texture, optical clarity, viscosity, hardness, malleability, ductility, conductivity, density

What are chemical properties?

Are properties that describe how a substance reacts Ex: ability to react with water, ability to react with acid, ability to react with oxygen, ability to burn