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Chemical Reactions Flashcards | StudBud
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Chemical Reactions
Chemical Reactions
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Answers
1
During a chemical reaction, if the temperature drops, the reaction can be described as
Endothermic
Temperapedic
Exothermic
None of the above
2
What can affect the rate of a reaction?
Surface Area
Nothing
Concentration
Heat
3
Why does a higher temperature increase reaction rates?
It increases the frequency and energy of particle collisions.
It increases the frequency of particle collisions only.
It reduces the activation energy of the reaction.
It increases the energy of particle collisions only.
4
Exothermic reactions...
releases thermal energy
absorbs thermal energy
needs energy to be added constantly to continue
5
What type of Reaction is this?
Synthesis
Combustion
Single Replacement
Double Replacement
6
Why do we use chemical Equations?
To help kid learn math
sciencetists made it up to make chemistry more fun
to see if people understands chemistry
To see what is actually happening in a reaction
7
Where does released energy come from during chemical reactions?
The breaking and forming of chemical bonds
The formation of bonds only
The breaking of bonds only
The burning of bonds
8
A Single-Replacement Reaction is...
a chemical reaction in which two or more substances combine to form another
a chemical reaction in which two or more substances combine to form another
a synthesis reaction in which two or more substances combine to form anothe
one element replaces another element in a compound.
9
During a chemical reaction, the atoms rearrange themselves to form new...
Elements
Nuclei
Molecules
Energy
10
Is this equation balanced or unbalanced? 2Mg + O
2
----> 2MgO
Unbalanced
Unbalanced
Balanced
Balanced
11
What term refers to substances that speed up chemical reactions?
Substrates
Catalysts
Promoters
Agents
12
Which factor would NOT speed up a chemical reaction?
stirring
making the reactant particles larger
adding a catalyst
raising the temperature
13
Endothermic reactions...
absorbs thermal energy
releases thermal energy
needs energy to be added constantly to continue
14
A Double -Replacement Reaction is...
the metal ion of one compound replaces the metal ion of the other
a chemical reaction in which two or more substances combine to form another
one element replaces another element in a compound.
a chemical reaction in which two or more substances combine to form another
15
Does this equation follow the Law of Conservation of Mass?
No
Yes
16
A Synthesis Reaction is...
a substance (fuel) reacts with oxygen to release energy in the form of heat
a chemical reaction in which two or more substances combine to form another
a reaction in which two or more substances combine to form one
a reaction in which the energy released is in the form of heat
17
A Decomposition Reaction is...
a synthesis reaction in which two or more substances combine to form anothe
a chemical reaction in which two or more substances combine to form another
a chemical reaction in which one substance breaks down into two or more
a substance (fuel) reacts with oxygen to release energy in the form of heat
18
During a chemical reaction, if the temperature rises, the reaction can be described as
Temperapedic
Exothermic
Endothermic
None of the above
19
What is a reactant?
A volatile chemical
The substance you start with before a chemical reaction
A dangerous substance
The substances that are formed by a chemical reaction
20
What is a product?
the thing you want to make
the substance formed in a chemical reaction
the substance you begin with in a chemical reaction
a fancy word for makeup
21
The law of conservation of mass means that
mass cannot be created or destroyed
mass can be created
mass is massive
mass can be destroyed
22
In chemical reactions, atoms are
destroyed
rearranged
copied
created
23
Does this equation follow the Law of Conservation of Mass?
No
Maybe
Yes
24
What are the products of combustion?
air
CO2+H20
fire
water
25
Matter can neither be created or destroyed during a chemical reaction. This relates to ...
The arrow in a chemical reaction
Exothermic Reactions
The Law of Conservation of Matter
Balancing Chemical Reactions
26
What term refers to substances that speed up chemical reactions?
Catalysts
Substrates
Agents
Promoters
27
The number of atoms that you begin with in a chemical reaction...
must be an even number
changes depending on how much energy is formed.
can be different to the number you finish with
must be the same as the number you finish with
28
How many individual iron atoms are in one molecule of Fe
2
O
3
?
6
3
2
5
29
Is this equation balanced or unbalanced? Na + Cl
2
----> NaCl
Balanced
Balanced
Unbalanced
Unbalanced
30
Which reaction can synthesis be
2NO+O2 = 2NO2
NH4OH = H2O + NH3
AB+C = B+AC
AB+CD = CB+AD
