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23 Cards in this Set
- Front
- Back
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What are the signs that a chemical reaction has occurred?
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Production of a gas
Color change |
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Reactants are _____
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on the left, they undergo a chemical reaction
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Products are __________.
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on the right, they are the end result of a chemical reaction
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What happens to the atoms in a chemical reaction?
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They are rearranged.
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exothermic is when....
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energy (heat) leaves reactants to the surroundings
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endothermic is when....
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energy (heat) is transferred to the reactants from the surroundings
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What is the energy source for photosynthesis?
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sun
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Synthesis Reaction
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a reaction of atleast two substances that forms a NEW, more complex compound
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Decomposition Reaction
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a reaction in which one compound BREAKS into at least two products
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Redox reactions
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a reaction that occurs when electrons are transferred from one reactant to another
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In a redox reaction, the substances that accept electons is said to be....
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reduced.
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Oxidized reactions...
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Substances that give up electrons
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A chemical equation can be balanced by changing or adding...
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coefficients
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A balanced chemical equation shows the proportions of reactant and products necessary for what?
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mass conservation
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Coefficients
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numbers in front of the chemical formulas (represent number of molecules)
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Subscripts
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number written after the element's symbol (number of atoms) CANNOT CHANGE!!!
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Total mass of products will always equal....
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total mass of reactants
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Factors that speed up or slow down a chemical reaction...
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catalysts (increase temperature, larger surface area, higher pressure, higher concentration)
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Yeast dough would rise more slowly if you...
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decrease temperature. (put it in fridge)
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Enzyme
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protein that is a catalyst for chemical reaction in living things
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equilibrium
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state in which a chemical reaction and its reverse occur at the same time and at the same rate
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Le Chatelier's principle
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If a change is made to a system in equilibrium, the equilibrium shifts to oppose the change until a new equilibrium is reached
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Increasing the concentration of one substance in an equilibrium reaction favors the reaction that produces what?
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produces less of that substance
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