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Chemical Reactions Flashcards | StudBud
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Chemical Reactions
Chemical Reactions
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1
A complex substance breaks down into two or more simpler substances.
single replacement rxn
decomposition rxn
synthesis rxn
double replacement rxn
2
A substance that enters into a chemical reaction.
subscript
product
formula
reactant
3
The chemical formula NH3 represent what compound?
ammonia
rust
baking soda
4
A change in matter that produces one or more new substances.
chemical reaction
chemical equation
product
coefficient
5
In the equation 2Na + Cl --> 2NaCl, what is the product?
2Na
Cl
2NaCl
6
A short, easy way to show a chemical reaction, using symbols instead of words.
formula
product
chemical equation
reaction
7
What is a molecule?
two or more products bonded together
two or more elements bonded together
two or more atoms bonded together
8
Energy is absorbed into a substance.
product
subscript
endothermic reaction
exothermic reaction
9
Different atoms in different compounds replace each other.
synthesis reaction
decomposition rxn
single replacement rxn
double replacement rxn
10
What is a change in matter that we look for in a chemical reaction?
change in the substance (properties)
precipitation
gas production
color change
11
A number in a chemical formula that tells the number of atoms in a molecule or compound.
product
formula
subscript
coefficient
12
What is a solid that is formed from a mixture of two liquids?
precipitation
gas
energy change
color change
13
Two or more simple substances combine to forma a new, more complex substance.
single replacement rx
synthesis rxn
decomposition rxn
double replacement rxn
14
A compost pile releases heat due to chemical reactions involving nitrogen. These reactions are:
endothermic
decomposition
exothermic
synthesis
15
A substance formed as a result of a chemical reaction.
reactant
reaction
formula
product
16
What is the ratio of C to Cl in the formula CCl4?
1C:4Cl
1C:Cl2
2C:4Cl
17
An uncombined element replaces an element that is part of a compound.
synthesis reaction
double replacement rxn
decomposition rxn
single replacement rxn
18
Which of the following is a metalloid?
antimony
sodium
bromine
19
What is an element?
compounds bonded
different elements bonded together
pure atoms
20
Energy is released from a substance.
endothermic reaction
product
formula
exothermic reaction
21
In a chemical formula, symbols identify what?
products
reactants
subscripts
Elements
22
When there are two or more products in a chemical reaction they are separated by what?
minus sign (-)
plus sign (+)
multiplication sign (X)
23
Which law states the amount of matter involved in a chemical reaction does not change?
Law of chemical Reactions
Law of Physics
Law of Chemistry
Law of Conservation of Mass
24
A number placed in front of a chemical formula in a chemical equation.
subscript
exothermic reaction
coefficient
endothermic reaction
25
A combination of symbols that shows the ratio of elements in a compound.
formula
product
chemical reaction
chemical equation
