# Unit 1 - Pure Substances and Mixtures Chapter 1: Classifying Matter 1.1 What is Matter?

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1 Unit 1 - Pure Substances and Mixtures Chapter 1: Classifying Matter 1.1 What is Matter? Vocabulary: matter anything that takes up space and has mass particles the tiny bits that all matter is made of - they are too small to be seen - there are different kinds - they don t look like the matter they make up chemistry the study of matter and its changes Check Your Learning p 13 #1-3 Board Notes 1.a) example answer: It may be difficult to understand that matter is made of very tiny particles that move because I can t see or touch these particles. Things like rocks and tables look completely solid and stationary. b) example answer: I can imagine particles to be similar to cell phone waves, or wireless Internet signals. I also can t see or touch them, but they must be real since my cell phone and router work. The same is true of air I can breathe it, even though I can t see it. Maybe particles are similar. 2. Matter is anything that has mass and volume (takes up space). All forms of matter are made of tiny particles. These particles are constantly moving in random directions. They are also attracted to each other. (examples of matter: pencil, horse, bike)

2 The 5 Main Points of Particle Theory 1. All matter consists of tiny particles. 2. There are empty spaces between particles. 3. Particles move continuously in random directions. 4. Heating particles increases their speed and the distance between them. 5. Since particles attract each other, they tend to stay together.

3 1.2 More About Matter: Solids, Liquids & Gases Vocabulary: volume a measure of the quantity of space occupied by an object solid a state of matter with a definite volume and definite shape liquid a state of matter with a definite volume, but no definite shape - a liquid takes the shape of its container gas a state of matter that has no definite volume and no definite shape - a gas takes the shape and volume of its container Check Your Learning p 16 # The three states of matter are: solid, liquid and gas. 3. Melting Ice explained with Particle Theory: The particles in a solid such as ice are bonded together so that they can vibrate but not move freely. When ice is heated, the particles begin vibrating more quickly. Eventually they break their

4 bonds and move freely past and around each other. When this happens, the solid ice melts into the liquid water. 4. A rock is a solid. Grape juice is a liquid. Air is a gas. Particle Theory Diagram Particles in a solid are strongly attracted to each other. They vibrate but do not move. Particles in a liquid are attracted to each other, but they can still move around each other. Particles in a gas are only weakly attracted to each other. They move quickly and far apart. 1.4 Pure Substances and Mixtures - Check Your Learning p 21 #1-3 Pure Substance matter that contains only one kind of particle examples: distilled water, salt, sugar, uranium, aluminum Mixture matter that contains two or more s mixed together examples: tap water, steel, air, cola, cloth, cereal

5 3. Milk is a mixture of water, fats, and other substances. This can be hard to see because most milk looks like just one type of substance. You can tell milk is a mixture though, because if you let it sit out it will separate into solid and liquid parts. p 26 Try This: Explore Mixtures at Home Name: Name of mixture Mixture 1 Mixture 2 Mixture 3 Mixture 4 Mechanical mixture or solution? Components of the mixtures Safety warning (if present) p 26 Try This: Explore Mixtures at Home Name: example answers Mixture 1 Mixture 2 Mixture 3 Mixture 4 Name of mixture potting soil chocolate milk orange juice (with pulp) bathroom cleaner (aerosol spray) Mechanical mixture or solution? mechanical mixture solution mechanical mixture mechanical mixture when Components of the mixtures Safety warning (if present) dirt, peat moss, bark, fertilizer can be flammable keep away from combustible material milk, chocolate syrup orange juice, sugar, pulp sprayed (bubbles)) water, isobutene, tetrasodium EDTA Butoxydiglycol none none can be flammable. Toxic. Use in a well-ventilated room.

6 1.6 Mechanical Mixtures and Solutions Check Your Learning p 27 #2-5 Mechanical Mixture also called a heterogeneous mixture - different particles are unevenly mixed - a mixture with different parts that you can see mechanical mixture

7 Solution also called a homogeneous mixture - different particles are evenly mixed - looks like a single type of matter (looks pure) - a uniform mixture of two or more s solution

8 3. Matter s can combine to form mixtures e.g. distilled water table salt mechanical solutions mixtures e.g. granola bar omelette 5. Stainless steel is a solution. A granola bar is a mechanical mixture. Clear apple juice is a solution. An omelette is a mechanical mixture. Soil from my backyard is a mechanical mixture. e.g. tap water air

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