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Ch. 7 - Tinder
Chemical Reactions
| Question | Answer |
|---|---|
| What happens to atoms in a chemical reaction? | They are rearranged. |
| What is a reactant? | a substance that goes through a change |
| What occurs in an exothermic reaction? | energy is transferred from the reactant to the surroundings |
| In what form/s is energy released during an isooctane reaction? | light and heat |
| identify the energy source for photosynthesis. | light energy |
| Which of these is an example of decomposition? a. exchange of ions between 2 compounds b. respiration c. photosynthesis d. digestion | digestion |
| What is formed during a synthesis reaction? | a new, more complex compound |
| What is formed during a synthesis reaction between sodium and chlorine? | sodium chloride |
| What are the products of water when it is broken down by electrolysis? | oxygen gas and hydrogen gas |
| A balanced chemical equation shows the proportions of reactants and products necessary for.... a. mass to be conserved. b. energy use to be minimized. | A. mass to be conserved |
| How is a chemical equation balanced? | by changing or adding coefficients |
| In the reaction 2H(2)O(2) -–2H(2)O +O(2), if you start with 4 mol of H(2)O(2), how many moles of O(2) do you end up with? *Numbers in ( ) are subscript. | 2 mol |
| In the reaction 2Mg + O(2) -- 2MgO, the law of definite proportions states that for every 2 moles of Mg you will need how many moles of O(2)? *Numbers in ( ) are subscript. | 1 mol |
| In the reaction H(2)S +2O(2) -- H(2)SO(4), the law of definite proportions predicts that for every mole of H(2)S you will need how many moles of O(2)? *Numbers in ( ) are subscript. | 2 mol |
| In order to have a balanced chemical equation, you need both the number of particles of reactants and products, and you need to know the number of ____. | moles |
| How can you change how fast yeast rises? | change the temperature |
| The total mass of the products always equals the ____ in a balanced chemical reaction. | total mass of the reactants |
| Why do large, bulky molecules react more slowly than smaller ones? | They collide with other molecules. |
| Why are enzymes used? | to speed up a biochemical reaction |
| What enzyme breaks down cellulose into smaller molecules? | cellulase |
| Explain equilibrium. | It's a chemical reaction and its reverse happening at the same time and at the same rate. |
| Explain Le Chatelier's principle. | increasing temperature favors a reaction that absorbs energy as heat |
| What is used in a combustion reaction to make reactants burn? | oxygen |
| What is the name of the reaction that involves the transfer of electrons? | redox |
| Why is the mole ratio an important concept for a scientist who frequently measures and mixes chemicals in a lab? | |
| True or False: A substance is said to be reduced when it gains electrons. | True |
| Why is it incorrect to balance a chemical equation by changing the subscripts? | The subscripts represent the number of atoms of each element in each chemical formula. If you change the subscripts, you change the compounds the formulas are describing. |
Created by:
TinderT
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