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7th Grade Unit 10: Chemical Reactions and Compounds Lesson 1: Chemical Properties and Changes Vocabulary of Instruction:

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Presentation on theme: "7th Grade Unit 10: Chemical Reactions and Compounds Lesson 1: Chemical Properties and Changes Vocabulary of Instruction:"— Presentation transcript:

1 7th Grade Unit 10: Chemical Reactions and Compounds Lesson 1: Chemical Properties and Changes Vocabulary of Instruction:

2 1. Chemical Change The atoms of a substance are rearranged into new substances with different chemical composition. Some evidence of a chemical change include: –color change –odor change –bubbling –fizzing (production of gas) –production of light or heat and the –formation of a solid (precipitate).

3 2. Chemical Property Describes a substance’s ability to lose its original identity and change into one or more new substances.

4 3. Chemical Reaction Describes the interaction or combination between two or more substances that produces new substances, which characteristics are different from the original substances.

5 4. Combustion A chemical reaction in which a substance (fuel, paper, wood, plastic, etc.) reacts with oxygen to give off heat and light. The act or process of burning, ignition, or incineration.

6 5. Corrosion The process of the destruction, deterioration, or decomposition of a metal when it is exposed to air and water.

7 6. Oxidation A chemical reaction with oxygen that removes electrons from an element or compound.

8 7. Physical Change The transformatio n of the external appearance of a substance that does not convert it into a new substance.

9 8. Physical Property The external appearance or characteristic of a substance that can be observed. Odor Color hardness Structure Solubility melting point

10 9. Tarnish Layer of corrosion that is formed on the surface of metals or alloys due to corrosion or oxidation.

11 10. Reactant The substances or compounds that you start with in a chemical equation (left side). REACTANT

12 11. Product The substances or compounds that you have at the end of a chemical equation (right side). PRODUCT

13 12. Element A substance that can not be broken down into any other substances by chemical of physical means (carbon, hydrogen, oxygen, nitrogen, etc.).

14 13. Compound A substance made of two or more elements that are chemically bound together in a set ratio. Examples: –carbon dioxide – water

15 14. Chemical Equation A short, simple way to describe a chemical reaction using symbols and formulas instead of words, such as photosynthesis and respiration: 6CO 2 + 6H 2 O + Sunlight  6O 2 + C 6 H 12 O 6 + Heat Example Equation:


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