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27 Cards in this Set
- Front
- Back
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A change in color, such as rusting of metal, is a sign that
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a chemical reaction has taken place
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A substance that undergoes a change in a chemical reaction is a
a. product b. a reactant |
a product
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What happens in a chemical reaction?
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substances go through chemical changes to form new substances
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In an exothermic reaction.....
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energy is released to the surroundings as heat
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Which statement about endothermic reactions is correct?
a. Energy is always created in the form of heat b. Energy is transferred from the surroundings to the reactants c. Energy is used to force electrons to move to higher energy levels d. Energy is transferred from the reactants to the surroundings |
b.
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Define chemical energy
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energy that is stored in the form of chemical bonds
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The energy source in photosynthesis is
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light
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A synthesis reaction is a reaction between at least two compunds in which
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a new compound is formed
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Name an example of a decomposition reaction
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electrolysis of water
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The product of a synthesis reaction between sodium an dchlorine gas is
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2NaCl
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When methan reacts with abundant amounts of oxygen, the products are
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?
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When water is broken down by electrolysis, the products are
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2H2+ O2
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Fragments of molecules that have at least one electron available for bonding are called
a. ions b. orbits c. protons d. radicals |
a.
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The law of definite proportions states that a compund always contains the same ____ in the same ____.
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Elements
ratios |
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All of the following factors may speed up a chemical reaction exept
ab. smaller surface area b. higher pressure c. higher temperature d. presence of catalyst |
b.
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Large, bulky molecules react more slowly than small ones because they have less opportunnity to
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move
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What could you do to make yeast dought rise more slowly
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decrease heat
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A change of ___ is a sign that a chemicalreaction is talking place
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color
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A sign that a chemical reaction is taking please is release of energy in the form of ___ or __.
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gas
heat |
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The changes that are visible during a chemical reaction are signs that the ___ in the reacctants have been rearranged
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molecules
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In a chemical raction atoms are ____ but are not created or destroyed
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rearranged
A+B ------>AB AB----->A+B AB+C----> AC+B |
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A chemical reaction that transfers energy from the reactants to the suuroundings is reffered to as ____.
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exothermic
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A(n) _____ reaction is one in which heat is transferred from the surroundings to the reactants.
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endothermic
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The general formula for a synthesis reaction is _____
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A+B---> AB
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In a _____ reaction, the reactants are broken down into other substances
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decomposition
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IN a combustion reaction,___ is used to make reactants burn.
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oxygen
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Aluminum undergoes a single- displacement reaction with coper (II) sulfate to form aluminum sulfate and ____.
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copper
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