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Chemcial Reactions
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What side of the arrow would energy or heat be on if the reaction is exothermic?
right (product)
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2 atoms of calcium can react to create 6 atoms of calcium.
false
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This is the type of reaction that during a reaction thermal energy is absorbed.
endoterhmic reaction
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Brennan watched as 2 compounds reacted and changed into 2 different compounds. What type of reaction is this?
double replacement
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This is the minimum amount of energy needed for a chemical reaction to occur.
activation energy
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What would the coefficient be in this reaction? Cu2O + C --> Cu + C02
2Cu2O and 4Cu
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What is NaCl?
salt
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This is something that speeds up a chemical reaction but does not change itself.
catalyst
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In the reaction: C3H8 + 5O2 --> 4H2O + 3CO2, how many oxygen atom are on the product side?
10
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Nate observed an experiment where 1 substance produced 2 substances. What type of a reaction is this?
decomposition
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what type of reaction becomes colder?
endothermic
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A change in shape of an object is an example of ____.
physical change
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In the reaction methane + oxygen yields carbon dioxide + water, what are the reactants?
methane + oxygen
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During a combustion reaction, what element must be part of the reactant?
oxygen (O2)
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Where would the coefficient belong in this reaction? NaCl --> Na + Cl2
before NaCl and Na
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All chemical reactions occur at the same rate.
false
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Which of the following is NOT evidence of a chemical change? color, temperature, odor, state of matter
state of matter
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If the arrangement of atoms in a substance changes, chemical properties are the same but physical properties change.
false
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This is certain proof that a chemical reaction has occurred.
change of chemical properties
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Atoms are not ____ during a chemical reaction according to the law of conservation of mass.
created or destroyed
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An experiment has 1 element and 1 compound and ends up with a different element and a different compound. What type of reaction is this?
single replacement
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Energy is needed to break the bonds in a chemical reaction.
true
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This slows down a chemical reaction.
inhibitor
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In a chemical reaction, what are the substances on the right side of the arrow called?
product
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Chemical reactions are balanced by changing the subscripts of the molecules.
false
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Which will burn fastest in open air, a log 2 feet in diameter, or a pile of splinters made from a 2 foot diameter log?
pile of splinters made from a 2 foot diameter log
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