UNIT 2: ATOMS, ELEMENTS AND COMPOUNDS Chapter 4: Properties of Elements and Compounds (Page 136-175)

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4.1 Studying Matter (Pages 136-148) Homework: Page 148 # 1-5, 8 Key concepts: (Page148) When studying matter, it is important to know the location of safety equipment in your classroom and the meanings of the safety icons and WHMIS symbols. Matter can be classified according to its composition, as mixtures or pure substances.

An element is a pure substance that cannot be broken down into simpler substances through physical or chemical methods. A compound is a pure substance that is composed of two or more elements that are chemically combined. A compound can be broken down into its elements only by chemical methods. The production and use of new chemicals can have both negative and positive consequences. Benefits must be weighed against negative consequences

Classification of Matter: Copy down Figure 4.3: Matter Mixture Pure Substances Mechanical Mixture Solution Element Compound 2. What is matter? Matter is anything that has mass and occupies space.

Particle Theory of Matter: 3. List the particle Theory of Matter. All matter is made up of tiny particles. Each pure substance has its own kind of particle which is different from the particles of other pure substances. Particles attract each other. Particles are always moving. Particles at a higher temperature move faster, on average, than particles at a lower temperature.

Mixture Pure substances 4. What are two classification of matter according to the particle theory of matter? List examples of each Matter Mixture Pure substances Matter that contains more than Matter that contains than one kind of particle. only one kind of particle. Examples: Water is a pure substance but salt water is a mixture of salt dissolved in water. Oxygen gas is a pure substance but the air we breathe is a mixture of gases that includes nitrogen, oxygen, carbon dioxide and other components.

5. What are the two types of pure substances 5. What are the two types of pure substances? Describe each one and list examples of each. Pure substances Element Compound is a pure substance that cannot be is a pure substance that is made broken down further by chemical or of two or more different elements physical methods that are chemically combined zinc, copper, gold, helium salt (sodium chloride), water

6. Differentiate between a compound and a mixture? A compound has two or more different elements that are chemically combined. While a mixture has two or more particles or has more than one kind of particles.

7. List different ways on how to separate mixtures. filtering or sifting, distillation, evaporation, use of magnets, and by hand

9. Name an element that is part of your everyday life, and describe how you use it. Gold/Silver: wear as a part of jewellery Oxygen: inhaled and transported by our respiratory system

Chemistry, Society, and the Environment: 10. Summarize some of the important issues related to the use and production of chemicals by completing the table below. Issue- Industrial Waste Production Use of Fertilizers and Pesticides Consumer Products Packaging/Disposal Application-Manufacturing Farming/Aquaculture/Horticulture Advantage or Disadvantage- Computer Hardware Disposal