1) What is a chemical reaction? a) A fórmula b) Is like a combination of atoms c) a process that involves rearrangement of the molecular or ionic structure 2) How we can determinate a chemical reaction? a) color change, formation of a precipitate, formation of a gas b) Solid,smells weir c)  Looks density, is hard to see,make gas 3) Example of product of chemical reaction? a) Clothes, aluminum b) Air, gas, books c) photosynthesis, rust, baking, digestion, combustion, 4) Where the petroleum come from? a) Formed with the rain b) The trees c) Earth's surface 5) We depend os the sciences and technology? a) No b) Yes c) Not in total but is a very important part of us 6) Is important make equation in chemistry? a) Yes b) No,we can make the things like we want c) No 7) The result of the products are always the same? a) Yes b) Of curse c) No 8) What is combustion? a) combination of a substance with oxygen, involving the production of heat and light. b) Burn something c) A chemical compound 9) What does mean “+” a) That we have more b) Is the sum of two compounds c) Plus  10) Example of a product derived from petroleum a) Gasoline b) Water c) Dolls

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