CHEMISTRY Unit 3 & Unit 4 Review. Element An element is a pure substance made of only one kind of matter. The Periodic Table lists all the known elements.

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Presentation transcript:

CHEMISTRY Unit 3 & Unit 4 Review

Element An element is a pure substance made of only one kind of matter. The Periodic Table lists all the known elements

Element Cube Each element on the Periodic Table gives information about the element

Know how to find: Protons (5) Electrons (5) Atomic Mass (11) Neutrons (Atomic Mass-Protons = 6)

Show me… Groups stay together Period!

Rare Earth Rare Earth Group Period 789

Mixture A substance of two or more elements mixed together. Substances are held together by physical forces, NOT chemical. Can be easily separated.

MIXTURE OF CANDY TRAIL MIX

SALAD SALT WATER SOLUTION

Compound A substance made by chemically combining two or more elements. Can only be separated by chemical means NOT physical. Chemical and physical properties are different than the elements they are made from.

Table Salt (NaCl) Water (H2O)

Alkaseltzer (Sodium Bicarbonate – NaHCO3) Table Sugar (C12H22O11)

Physical Properties A property that can be observed, measured or changed without changing the substance itself

Examples of Physical Properties Odor Density Mass Volume State Color

Chemical Properties A property of matter that describes a substance based on its ability to change into a new substance with different properties. Poisonous Gas Explosive Powder Table Salt =+

Examples of ChemicalProperties Flammability Reactivity

Physical Change A change that affects one or more physical properties of a substance

Chemical Change A change that happens when two or more substances are changed into one or more new substances with different properties.

Evidence of Chemical Reactions Temperature Change Heat is absorbed by the substances causing the temperature to decrease Heat is released by the substances causing the temperature to increase SMOKE

Evidence of Chemical Reactions Fizzing When a gas is formed it may try to escape causing bubbles

Evidence of Chemical Reactions Color Change This is evidence of a chemical reaction only when the other properties have also changed. Chemical Change Not a Chemical Change

Evidence of Chemical Reactions Precipitate Formed Precipitate is a solid substance formed when liquids are combined

Evidence of Chemical Reactions Light When a new substance is formed light energy can be produced.

Know Chemistry Vocabulary #5 1.Oxidation - The combination of a substance with oxygen and will form rust or tarnish. 2.Substance - that of which a thing consists; physical matter or material 3. Chemistry – The scientific study of the structure, properties, and reactions of the chemical elements and the compounds they form. 4. Chemist - A scientist specializing in chemistry. 5. Energy – The ability to do work.

Frying an egg

Chemical Change

Red paint + Yellow paint = Orange

Physical change

Effervescent tablets bubbling

Chemical Change

Melting butter

Physical Change

Bending a paper clip

Physical Change

Sanding wood

Physical Change

Copper tarnishing (notice green on 2 nd coin)

Chemical Change

Baking a Cake

Chemical Change

Explosion!

Mixture of apples & watermelon

Physical Change

Eating & Digesting Food

Chemical Change

Can being Crushed

Physical Change