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Chemical Reactions
Term | Definition |
---|---|
Chemical Reaction | A reaction where the original substance is changed into a new substance. |
Law of Conservation of Mass | Mass cannot be created or destroyed. |
Reactants | Substances that are added and react with each other in a chemical reaction. |
Products | Substances that are produced from a chemical reaction. |
What does the subscript below an oxygen molecule tell you in O2? | There are two atoms of oxygen in the molecule. |
What the coefficient in front of a water molecule tell you in 2H2O? | There are two molecules of water. |
What number is missing in this equation? ______ Ca + 1 O2 ----> 2 CaO | 2 |
Find the unknown mass for the following chemical equation. Magnesium + Oxygen -------> Magnesium Oxide 12.1 g + 10.0 g | 22.1 g of magnesium oxide |
In the formula below, list how many atoms of each element there are. CH4 + 2 O2 ---------> CO2 + 2H2O | C : 1 H: 4 O: 4 |
What is a catalyst? Examples of a catalyst. | A substance that speeds up a chemical reaction. Examples: Yeast, Catalase |
What are some examples that a chemical reaction has occurred? | Change in color, temperature, production of a gas. |
What is an exothermic reaction? | A reaction that releases heat or light. |
What is an endothermic reaction? | A reaction where heat is absorbed. |
When decomposing hydrogen peroxide, what was the catalyst being use? | Yeast. |