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L7&L8 Matter Overall
L7&L8 Matter Overall Assessment
Question | Answer |
---|---|
Chemical reaction | Process in which one or more new substances form from one or more other substances |
Reactant | Substance that exists before a chemical reaction takes place and changes as a result of the reaction |
Product | New substance that forms during a chemical reaction |
Chemical Equation | Shorthand notation made up of arrows and chemical formulas for reactants and products that summarizes what happens during a chemical reaction |
Law of Conservation of Matter | Scientific law stating that matter cannot be created or destroyed |
Scientific law | Verbal or mathematical description of a natural phenomenon that does not explain the phenomenon. |
Matter | What cannot be created or destroyed during a chemical reaction? |
Before and after | One way to know if a chemical reaction has taken place is to measure the mass when? |
Equal to | The mass before the reaction should be ______________ the mass after the reaction. |
mass of the products | The mass of the reactants should be equal to the ____________________. |
Atoms rearrange | Breaking apart and joining in a new way |
Exothermic reaction | Chemical reaction that releases more energy to the surroundings than it absorbs |
Endothermic reaction | Chemical reaction that absorbs more energy from the surroundings than it releases |
Prototype | Full-scale, working model of a design that can be tested as part of the design process |
Products of exothermic reactions will... | getting hot, giving off light, making noise |
Products of endothermic reactions will... | feel cool/cold, temperature will go down |
endothermic, energy is written on the _______ side of the chemical equation | left, since it is going into the reaction |
exothermic, energy is written on the _______ side of the chemical equation | right, since it is coming out of the reaction |
Engineers build, test and redesign prototypes to... | perfect the design solutions, and have it meet all the criteria |
4Fe + 3O₂ → 2Fe₂O₃ + energy | this reaction is exothermic since energy is coming out of the reaction |
NH₄Cl + H₂O + Energy → 2NH₄OH + HCl | this reaction is endo thermic since energy went in as a reactant |