Unit 3-1 Physical and Chemical Changes!.

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Presentation transcript:

Unit 3-1 Physical and Chemical Changes!

Physical Change A physical change is when an object undergoes a change that does not alter their chemical properties. Examples: Cutting or breaking an object Any phase change (solid, liquid, gas) Adding food coloring to food Biting an apple

Chemical Change A chemical change is when a substance reacts with another substance and a NEW SUBSTANCE IS FORMED! Examples: Rusting of iron or tarnishing of silver Cooking of eggs The browning of an apple after it is bitten Burning (like oil or wood)

Remember: A chemical change always means that 1 or more new substances are formed!

Chemical Changes

Physical Properties Physical properties are properties that DO NOT change the chemical nature of matter. Examples are: Color Smell Freezing/melting point Boiling/vaporization point Attraction to magnets Density Hardness of a mineral

Chemical Properties Chemical properties are properties that DO change the chemical nature of matter. Examples: heat of combustion reactivity with water Flammability pH (how acidic something is) Corrosion

chemical change 1. Milk turns sour. This is a . A. Chemical Change B. Physical Change C. Chemical Property D. Physical Property 2. HCl being a strong acid is a ; Wood sawed in two is . A. Chemical Change, Physical Change B. Physical Change, Chemical Change C. Chemical Property, Physical Change D. Physical Property, Chemical Change chemical property physical change

3. CuSO4 is dissolved in water: A. Chemical Change B. Physical Change C. Chemical Property D. Physical Property 4. Aluminum Phosphate has a density of 2.566 g/cm3: Physical Change Physical Property

5. Which of the following are examples of matter? A. A Dog B. Carbon Dioxide C. Ice Cubes D. copper (II) nitrate E. A Moving Car F. All of the above 6. The formation of gas bubbles is a sign of what type of change? All of the above Chemical Change

7. True or False: Bread rising is a physical property. 8. True or False: Dicing potatoes is a physical change. 9. Is sunlight matter? 10. The mass of lead is a property. False True No Physical