Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
|
Endothermic |
A reaction in which energy is obsorbed |
|
|
Exothermic |
A reaction in which energy is released in the form of heat |
|
|
Chemical reactions involve two changes |
1- formation of a new substance 2-change in energy |
|
|
Combution |
A rapid reaction between oxygen and a fuel |
|
|
What 3 things are needed to start and maintain a fire |
Fuel, oxygen, and heat |
|
|
Combustion of a fuel results in these |
Carbon dioxide and water |
|
|
Fuel |
A material that releases energy when burned |
|
|
Types of fuels |
Oil, coal, wood, gasoline, and paper |
|
|
The result of combustion |
Fire |
|
|
An equation is balanced when it |
Represents conservation of mass |
|
|
To balance a chemical reaction you may need to use |
Coefficients |
|
|
Coefficents |
Tells you how many atoms of molecules of a reactant or a product take part in the reaction |
|
|
Synthesis |
2 or more elements combine to form a more complex substance |
|
|
Decomposition |
A complex substance is broken apart into similar substances |
|
|
Replacement |
One element replaces another or 2 elements in different compounds trade positions. Can be double or single |
|
|
A closed system |
A system in which matter cannot enter or excape from the surroundings |
|
|
Activation energy |
The minimal amount of energy needed the start a reaction |
|
|
Surface area |
To increase the rate of reaction, you can break the solid into smaller pieces |
|
|
Tempeture |
Faster moving particals come into contact more often, which means there are more opportunities for reaction to occur |
|
|
Reactant concentrate |
Increasing the concentration of reactants makes more particals avalible to react |
|
|
Catalysts |
A material that increases the rate of a reaction by lowering the activation energy |
|
|
Example of a catalysts |
Enzymes in your body |
|
|
Inhibitors |
A material used to decrease the rate of a reaction |
|
|
Matter can be destroyed. True or false? |
False |
