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Chemical Reaction
Quiz
Question | Answer |
---|---|
Reactants | substances present at the beginning of a chemical reaction |
Products | what happens; products come from a reaction |
Exothermic | When the temperature of a chemical reaction increases |
Endothermic | When the temperature of a chemical reaction decreases |
Law of Conservation | Matter cannot be created or destroyed, but it can change forms |
Mixture | a combination of two or more substances |
Solution | a mixture in which a substance dissolves evenly in another substance |
Dissolve | get smaller and smaller until the substance is invisible |
Solute | the substance that dissolves |
Solvent | part of a substance that dissolves the solute, usually has more volume |
Natural | a product from plants, animals or earth |
Synthetic | made by people; natural resources changed chemically |
Are atoms created or destroyed in a chemical reaction? | Atoms are not created/destroyed. No new atoms are created/destroyed. They are rearranged into different compounds. In chemical reactions, reactants contact each other, bonds are broken/formed , atoms are rearranged to form new bonds to make products. |
Describe how atoms get rearranged in a chemical reaction. | Atoms are not created or destroyed in a chemical reaction. Instead, they are rearranged. For example when a candle is burned, it seems as though the candle slowly disappears over time however this is not the case. |
Explain the law of conservation of mass. | In a closed or isolated system, matter cannot be created or destroyed. It can change forms. |
Describe the difference between mixtures and solutions. Give examples for each. | A mixture is two or more substances that do not chemically combine like cereal. A solution is a mixture where one substance is dissolved in the other. |
What are the positive and negative impacts of using natural and synthetic products. | Synthetic-taste good but uses too much waste. Natural tastes good and has nutrients, but it uses too much energy. |