Level 1 - Element, Compound, MIxtures

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Types of Radiation : 1.Alpha (a) 2.Beta (B) 3.Gamma (g)

Uses of radioactive elements : 1.Determine the age of Fossils, Producing energy, Medical Uses, Atomic Bomb

Radiation can be detected by Geiger counter.

Radioactivity was first discovered in 1896 by the French scientist Henri Becquerel.

Solid - Solid Mixtures - Metal & Non-Metals : Magnetic attraction

Liquid - Liquid Mixtures - Immiscible liquid : Separation funnel, Centrifuge Miscible liquid - Fractional distillation, Chromatography

Solid - Liquid Mixtures - Insoluble solid : Filtration, Decanting, Centrifuge, Magnetic attraction Soluble solid : Evaporation, Crystallization, Simple Distillation

Types of Mixtures - Homogeneous and Heterogeneous Homogeneous : Solution (Less than 1nm) Heterogeneous : Colloid (1nm - 1000nm), Suspension (More than 1000nm)

Examples of Compounds - When magnesium (Mg) burns with oxygen (O), there is a lot of heat and light.This is a chemical reaction, we get a compound: Magnesium oxide (MgO) Examples of Mixtures - Mixtures of gases in the air.No chemical reaction.No new substance is formed.All elements keep their properties.

Chemical change - A change that is very hard to reverse.May reverse the change by heat or electricity.Example : Burning fossil fuel Physical change - Can be easily reversed.Does not change the properties of the substances.Example : Scrambled paper

A compounds is formed when 2 or more different elements combine together by a chemical reaction.Compound can be split to smaller substances.But elements is made up of 1 or more atoms of the same types.Element is a pure substances, it cannot be split up to something smaller.And A mixture is formed when 2 more substances are mixed together by a physical method such as stirring, shaking, dissolving.

Examples of Elements : Oxygen, Carbon

Elements Are classified to 3 groups: 1.Metals 2.Non-Metals 3.Metalloids

An element is the simplest form of matter.

Level 1 - Element, Compound, Mixture

Lesson 3 - Separation Methods

Lesson 4 - Radioactive Elements

Lesson 2 - Compounds & Mixtures

Lesson 1 - Elements