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Science
Science 6.1 and 6.2
Question | Answer |
---|---|
Two main kinds of changes that you can see when there is a chemical reaction. | 1. formation of a new substance 2. change in energy |
5 evidences that a chemical reaction has occurred | 1. gas formation 2. precipitate formation 3. Odor formation 4. New color formation 5. Change in temperature (energy) |
What happens to energy in an endothermic reaction? | It is absorbed. |
What happens to energy in an exothermic reaction? | It is released. |
What is written on the left side of the equation? | reactants |
What is written on the right side of the equation? | products |
How is an arrow read in a chemical equation? | yields |
Why must an equation be balanced? | To show Conservation of Mass. |
Where is a coefficient written and what does it represent? | To the left of the element or compound, indicating the number of atoms or molecules there are |
What type of reaction is this? 2 or more substances combining to form a more complex substance | synthesis |
Two or more substances breaking down into simpler substances? | decomposition |
One element replaces another element? | single replacement |
Elements in one compound trade places with elements in another compound? | double replacement |
What kind of equation has oxygen as a reactant and carbon dioxide and water are two of the products? | combustion |