| A | B |
|---|
| activation energy | energy required to start a reaction |
| catalyst | substance that speeds up a reaction, but is not used up in the process. Example: Enzymes |
| collision theory | molecules or atoms must collide with one another in order to react. The more they collide the faster the reaction will take place. |
| concentration | how much material is in a given volume of solvent. The higher the concentration, the faster the reaction normally takes place. |
| endothermic reaction | chemical reaction in which energy is absorbed. It will feel cold. |
| exothermic reaction | chemical reaction in which energy is released. It will feel hot. |
| law of conservation of mass. | Matter can not be created or destroyed during a chemical reaction, therefore the mass of the products must be equal to the mass of the reactants in a chemical reaction. |
| product | what is produced during a reaction |
| reactant | materials that are present at the start of a chemical reaction. |
| reaction rate | how fast or slow a reaction occurs |
| four factors that effect reaction rate are: | temperature, concentration, catalyst, surface area. |
| Three environmental problems associated with chemical reactions: | acid rain, global warming/greenhouse effect and ozone depletion. |
| How could you prove that matter is not created or destroyed during a chemical reaction? | By performing an experiment in an air tight container. Find the mass of the container and the materials before the reaction and find the mass of the container and the materials after the reaction. The mass should stay the same. |
| Is the following reation exothermic or endothermic? Na + Cl + energy produces NaCl | Endothermic because energy is absorbed. It is part of the reactants |
| Is the following reaction exothermic or endothermic? H + O produces HO + energy | exothermic because energy is released. It is part of the products. |
| Would a large cube of salt dissolve faster or slower than small specks of salt? Why? | A large cube of salt will dissolve slower than small specks of salt because a cube of salt has less surface area. |
