Elements Compounds and Mixtures

Atom Basic unit of matter Structure= Protons + Electrons- Neutrons ± Cannot break down further

Atoms Atoms are made up of electrons neutrons and protons.

Elements The Most Basic Form of Matter Elements are made up of identical atoms. Elements are pure substances that cannot broken down in to simpler substances. Gold

Compound Pure substance 2+ atoms Chemically combined Definite ratio Can separate using Chemical means –Electrolysis –Combustion

Compounds Made up of two or more elements in a specific or definite ratio. NH 3 CH 4

H O H O HH H 2 and 0 2

H O H O HH Chemically Combine to form H 2 O

Mixture Impure Substance Physically combined Indefinite ratio Can separate using physical means –Filtration –Chromatography –Properties differences

Mixture Mixture is two or more substances that retain their identity.

Tyndall Effect No! Yes! John Tyndall

Tyndall= DON’T see light particles= colloid

Mixture Heterogeneous Homogeneous SuspensionSolutionColloid Eventually settles in to layers Can’t see particles Never settles No Tyndall Effect Visible particles Yes the Tyndall Effect is observed Never settles Yes the Tyndall Effect is observed

Quick Quiz: which would be the element? Compound? Mixture?

Reflection: DRAW and FILL IN Elements, Compounds, Mixtures ElementsMixturesCompounds Definition Ex. Homo-Hetero- Ex. Def. Ex. HINT!!! May be on test