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Ch. 2 Chemical Reactions Flashcards | StudBud
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Ch. 2 Chemical Reactions
Ch. 2 Chemical Reactions
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Ch. 2 Chemical Reactions
Flashcards
40 cards
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Questions
40
Answers
1
CaCO3 represents a chemical
formula
subscript
symbol
reaction
2
The rate of a chemical reaction is INDEPENDENT of temperature
false
true
3
What type of reaction is FeS+2HCl -> FeCl2 + H2S?
double replacement reaction
synthesis reaction
decomposition reaction
single replacement reaction
4
In a chemical reaction, chemical BONDS are formed or broken
false
true
5
A shorter, easier way to show chemical reactions, using symbols instead of words
chemical equation
subscript
chemical formula
symbol
6
A rapid reaction btwn O2 and fuel is known as
decomposition
combustion
activation
heat
7
Substances listed on the left side of a chemical equation are the
precipitates
products
coefficients
reactants
8
The only sure evidence for a chemical reaction is
production of one or more new substances
color change
changes in properties
the formation of a gas
9
The principle of conservation of mass is true
only for reactions that take place in closed systems
for no reactions at all
for reactions in both open and closed systems
only for reactions that take place in open systems
10
When a chemical reaction takes place in an open system,
matter can enter from surroundings but can't escape
matter can enter from or escape to the surroundings
matter isn't allowed to enter from or escape to surroundings
matter cannot move at all
11
SYNTHESIS is the process of making a more complex compound from simpler substances.
false
true
12
What is the best form of fire safety?
water hose
fire dept
fire prevention
extinguisher
13
Which two processes could be considered opposites?
a precipitate reaction and a synthesis reaction
a synthesis reaction and a decomposition reaction
single replacement reaction & a double replacement reaction
Decomposition reaction and a single replacement reaction
14
Chemistry is
substances that are observed w/o changing to other substance
a reaction btwn oxygen and a substance called fuel
anything that has mass and takes up space
study of matter and how matter changes
15
Chemical equation that shows same number of each kind of atom on both sides of equation
replacement reaction
unbalanced
balanced
incomplete reaction
16
The minimum amt of energy that has to be added to start a reaction is the
exothermic energy
endothermic energy
chemical energy
activation energy
17
Which does NOT increase # of particles available to react in a chemical reaction?
increasing the mass
adding a catalyst
increasing the concentration
increasing the surface area
18
The number placed below an element's symbol in a chemical formula is called a
coefficient
subscript
reactant
product
19
Which is example of how to supply activation energy to begin a reaction?
Cool the reaction flask in an ice bath
Add a catalyst
Heat the reaction flask on a hot plate
Add an inhibitor
20
A change that produces a new substance is a CHEMICAL change
false
true
21
The amount of matter in a chemical reaction CHANGES
false
true
22
A chemical reaction that absorbs energy in the form of heat is described as
exothermic
endothermic
unbalanced
combustion
23
Chemicals that act as biological catalysts by speeding up reactions in living things are
inhibitors
enzymes
fuels
reactants
24
Bottle of H2O2 that eventually turns into a bottle of water and oxygen gas is example of
replacement reaction
decomposition reaction
precipitate reaction
synthesis reaction
25
The best way to put out a small kitchen fire is to
cover it or use a home fire extinguisher
use a garden hose
turn off the appliance
blow it out
26
What happens when chemical bonds break and new bonds form?
matter is destroyed
physical change
chemical reaction
surface area increases
27
The materials present at the beginning of a chemical reaction are called the PRODUCTS
true
false
28
Correct equation for: Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide.
Na2 + O2 -> 2NaO
Na2O + O2 -> 2Na
2Na + O2 -> Na2O
Na2O -> Na + O2
29
A material used to decrease the rate of a chemical reaction is a(n)
catalyst
enzyme
inhibitor
fuel
30
A chemical reaction may be detected by observing changes in the PROPERTIES of matter.
false
true
31
Which of following is a balanced chemical equation?
H2O2 -> H2O + O2
2 Mg + HCl -> MgCl2 + H2
SO2 + O2 + 2H2O -> 4 H2SO4
2Fe2O3 + 3C -> 4Fe + 3CO2
32
In a chemical equation, what do the #s in front of a chemical formula tell you?
number of molecules or atoms of each substance in reaction
number of elements in the reaction
number of atoms in each molecule in the reaction
number of molecules in each atom in the reaction
33
Which is NOT a correct inference about burning of gasoline?
The reaction is a physical change
New substances are produced
Energy is released
Chemical bonds are broken and others are formed
34
The home fires that cause the most deaths start from carelessness with CIGARETTES
false
true
35
Every chemical reaction involves a change in
state
concentration
mass
energy
36
Anything that has mass and takes up space
matter
endothermic
energy
chemistry
37
Chemical reactions that absorb energy are said to be EXOTHERMIC
false
true
38
In what way can a fire be brought under control?
Remove O2
Remove CO2
Add fuel
Add O2
39
A gas necessary for combustion to take place is CO2
false
true
40
In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed
Total mass of reactants > than total mass of products
Total mass of reactants < total mass of products
Matter is not changed
