Term
|
Definition
| The activation energy of a chemical reaction: is supplied by a catalyst, is released at the end, starts the reaction, or changes with time. |
|
|
Term
|
Definition
| A chemical reaction in which a fuel combines rapidly with oxygen is an: inhibited reaction, combustion reaction, enzyme reaction, endothermic reaction? |
|
|
Term
|
Definition
| A chemical reaction in which 2 elements combine to form a compound. |
|
|
Term
|
Definition
| A chemical that gives off heat |
|
|
Term
| Firefighters open doors very slowly why? |
|
Definition
| Opening the door suddenly lets oxygen into the room. The added oxygen allows the fire to flare up. |
|
|
Term
| How are inhibitors useful in controlling chemical reactions? |
|
Definition
| the work by preventing reactants from coming together or combining. |
|
|
Term
| How do enzymes in your body make chemical reactions occur at safe temperatures? |
|
Definition
| they bring the reactant molecules closer together so it lowers the activation energy needed |
|
|
Term
| How does the energy of the product compare with the energy of the reactants? |
|
Definition
| The energy of the products is greater than the energy of the reactants. |
|
|
Term
| Some statues are made with materials that can react to acid rain and begin to dissolve. Very smooth statues dissolve slower than statues with intricate carvings |
|
Definition
| Detailed carvings provide more surface area for the acid rain to attach to and react with. |
|
|
Term
| Steel that is exposed to water and salt rusts quickly. If you were a shipbuilder, how would you protect your ship? |
|
Definition
| Paint the steel or cover it with a different kind of protectant |
|
|
Term
| Tell wether the diagram is Exo or Endo Thermic? |
|
Definition
| The reaction is endo thermic? How in the heck do you know that Nix?! :-) |
|
|
Term
| What are two kinds of changes that occur in matter? Describe how you can tell one from the other. |
|
Definition
| 2 kinds are Chemical and Physical changes. A physical change does not change a substance into another substance. A chemical change DOES change a substance into another substance |
|
|
Term
| What change in condition might account for the lower HUMP in the second graph? |
|
Definition
| The use of a catalyst might account for the lower "HUMP" in the second graph. This is because a catalyst is a material that lowers the activation energy. |
|
|
Term
| Why can't you balance a chemical equation by changing the subscripts of the reactants or the products? |
|
Definition
| Changing subscripts changes the chemical formula all together! DUH! |
|
|
Term
| Why does spraying water on a fire help extinguish it? |
|
Definition
| Because it removes part of the fire triangle. Oxygen. Right Nix? |
|
|
Term
| Which of the following is not a physical property? Flexibility, ability to catch fire, melting point, ability to conduct electricity. |
|
Definition
| Ability to catch fire dude |
|
|
Term
| You can balance a chemical equation by changing the : subscripts, coefficients, reactants, or products? Well? Which one? |
|
Definition
| Coefficients (What else?) |
|
|
Term
| You find a mass of a piece of iron metal, let it rust, and measure the mass again. The mass has increased. Does this violate the principal of conservation of MASS? |
|
Definition
| No because a chemical change occurred where a new substance was created, which actually added more MASS. |
|
|
