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Science Final Study Guide
Science Final Study Guide
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Answers
1
W
hat type of reaction is FeS + 2HCl----- FeCl
2
+H
2
S
a decomposition reaction
a double replacement reaction
a synthesis reaction
a single replacement reaction
2
Ioinc compounds are electrically
netural
positive
charged
negative
3
Which is a characteristic property of acids?
they turn red litmus paper blue
they do not react with metals
they taste bitter
They turn blue litmus paper red
4
The chemical name for the compound with the formula Na
2
S is
sodium fluoride
sodium sulfide
magnesium sulfide
lithium oxide
5
Orderly crystal shape high melting points& electric conductivity when dissolved in water are propertie of
ionic compound
True
False
6
Which is correct chemical equation following statment?Sodium reacts with oxygen in 2 to 1 ratio produce sodium oxide.
Na2 + O2------- Na2O2
4 Na + O2 -------- 2 Na2O
Na2O + O2------- 2 NaO
2 Na + O2------- 2 NaO
7
Synthesis
is the process of making a more complex compound from simpler substances
True
False
8
Which of the following is an examlpe of how to supply activiation energy to begin a reaction?
add an inhibitor
cool the reaction flask in an ice bath
add a catalyst
heat the reaciton flask on a hot plate
9
An ionic bond is the attraction between
netural atoms
neutral ions
similarly charged ions
oppositely charged ions
10
What does a neturalized reaction produce?
carbonated water
bases
acids
water and salt
11
Ions that are made of more than one atom are examples of
positive ions
negative ions
neutral ions
polyatomic ions
12
The rate of a chemical reaction is
independent of
temperature
False
True
13
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas i an example of a
decomposition reaction
replacement reaction
synthesis reaction
precipitate reaction
14
In a water solution, how do acids differ from bases?
Hydrogen ions (H+) remain dissolved, but hydoxide ions (OH-) do not
Acids form hydrongen irons (H+), while bases form hydroxide ions (OH-)
Acids turns litmus blue, while bases turn red
Acids form salts, but bases do not
15
Neturalization is a reation between a(n)
acid and a metal
acid and a base
salt and water
base and a salt
16
Which of the following best describes a metal crystal?
metal atoms held together by covalent bonds
netural metal ions surrounded by freely moving valence electrons
positive metal ions surrounded by freely moving valence electrons
metal atoms held together by ionic bonds
17
The only sure evidence for a chemical reaction is
the production of one or more new substance
a color change
the formation of a gas
changes in properites
18
You can find the pH of a substance by using
plain paper
litmus indicater
a conductivity tester
a thermometer
19
When a chemical reaction takes place in an open system,
matter can enter fromthe surroundings but cannot escape to the surroundings
matter can enter form or escape to the surroundings
matter cannot move at all
matter is not allowed to enter from or escape to the surroundings
20
Which is a property shared by most molecular compounds?
low melting point
high melting point
nonpolar bonds
high boiling pont
21
Acids are described as corrosive because they
taste bitter
"wear away" at other materials
feel slippery
turn litmus blue
22
A
nonpolar
bond is formed when two atoms share electrons unequally
True
False
23
CaCO
3
symbol
subscript
formula
reaction
24
When an atom loses an electron, it becomes a
positive atom
netural atom
netural ion
negative atom
25
A shorter, easier way to show a chemical reaction, using symbols instead of words, is called a
chemical equation
subscript
chemical formula
symbol
26
What is one way to increase the solubility of sugar in water?
chill the water
heat the water
increase the amount of water
increase the amount of sugar
27
What happens when chemical bonds break and new bonds form?
a physical change
a chemical change
surface area increases
matter is destroyed
28
Electrons involved in bonding between atoms are
closest to the nucleus
positiviley charged
inside the nucleus
valence electrons
29
A mixture made of two or more elements, at least one of which is a metal is called a(n)
metallic bond
complex metal
superconductor
alloy
30
Chemicals that act as biological catalyst by spreading up reactions in living things are called
inhibitors
enzymes
reactants
fuels
31
Among the factors that affect the solubility of a substance are type of solvent, pressure and
time.
True
False
32
How is a solute different froma solvent in a solution?
The solute is a solid and the solvent is a liquid
The solute is a present in a smaller amount
The solute is a liquid and the solvent is a gas
The solute is presente in a greater amount
33
When you add so much solute that no more dissolves, you have a
unsaturated solution
suspension
neturalization
saturated solution
34
The pH scale measures
the concentration of an acid
the concentration of hydrogen ions
the strenght of hydrogen ions
the strength of an acid
35
The minimum amount of energy needed to start a reaction is the
chemical energy
exothermic energy
activation energy
endothermic energy
36
The porperties of solid metals can eb explained by the
structure
of and the bonding among the metal atoms
False
True
37
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the "2" tell you?
There are two magnesium ions to every bromide ion.
There are two bromide ions for every magnesium ion
Bromide has a 2+ charge
Bromide has a 2- charge
38
A material used to decrease the rate of a chemical reaction is a(n)
inhibitor
catalyst
fuel
enzyme
39
A mixture contaning particles that are too small to be seen easily but are large enough to scatter a light beam called a
suspension
base
solution
colloid
40
What is a double bond?
a bond between two atoms
two pairs of electrons shared between four atoms
two pairs of electrons shared between two atoms
one pair of electrons shared between two atoms
41
A liquid mixture in which particles can be seen and easily separated by settling or filtration is a?
solute
solution
suspension
solvent
42
Weak tea is an example of a,
dilute solution
solvent
suspension
concentrated solution
43
Which of the following is a property of ionic compounds?
they have low boiling points
they contain no charged particles
They have low melting points
they form hard, brittle crystals
44
Which two processes could be considered opposites
a decomposition reaction and a single replacement reaction
a synthesis reaction and a decomposition reaction
a precipitate reaction and a decomposition reaction
a single replancement reaction and a double replacment reaction
45
The principle of conversation of mass is true
for reations in both open and closed systems
for no reactions at all
only for reations that take place in open systems
only for reactions that take place in closed systems
46
How can a scientist safely tell whether an unknown soultion is a salt on water or sugar in water?
by tasting the solution
by smelling the solution
by testing the electric conductivity of the solution
by filtering the solution
47
The substances listed on the left side of a chemical equation are the
products
precopitates
reactants
coefficents
48
Physical
changes occur when existing bonds break and new bonds form
True
False
49
The amount of matter in a chemical reaction
changes
False
True
50
In water, bases form
oxide ions
hydroxide ions
hydrogen ions
hydrogen gas
51
When a few spoonsful of sugar are mixed into a cup of water, sugar is the?
solute
solvent
acid
base
52
Bases feel slippery and taste
sour
True
False
53
In the chemical formula for an ionic compound, which item is written first?
the name of the negative ion
the charges
the subscripts
the name of the positive ion
54
In chemical reactions, what does tha principle of conservation of math mean?
The total mass of the reactants is less than the total mass of the product
Matter is not created nor destroyed
Matter is not changed
The total mass of the reactants is greater than the total mass of product
55
When a solute is added to a solvent, the frezzing point of the solution is,
lower than the freezing point of either substance alone
the same as the freezing point of the solvent
higher than the freezing point of either substance alone
the same as the freezing point of the solute
56
When a solid compound dissolves in water,
it always conducts electricity
each of its particles becomes surrounded by water molecules
it breaks up into individual crystals
its particles surround individual water molecules
57
The products of a neutralization reaction are
acids and bases.
True
False
58
Which of the following groups contains the most reactive elements?
the alkali metals
the carbon family
the alkali earth metals
the noble gases
59
How would a solute affect the boiling point of water?
the water will boil at a higher temperature
the water will boil at a lower temperature
the water will not boil
the boiling point will be the same as the frezzing point
60
A chemical reaction that absorbs energy in the ofrmof heat is described as
unbalanced
endothermic
exotherimic
combustion
61
A chemical bond formed when two atoms share electrons is called a(n)
polyatomic bond
ionic bond
covalent bond
metallic bond
62
A low melting point is one property of
molecular
compounds
True
False
63
Which of the following terms means that metal can be rolled into thin sheets, beaten into complex shapes?
ductile
alloy
polar
malleable
64
Bases form
hydrogen ions
(H
+
) when dissolved in water
False
True
65
Chemistry is
a rapid reaction between oxygen and a substance called a fuel
characterstic ofsubstance be observedwithout changingthe sub in another sub
the study of matter and how matter changes
anything that has mass and takes up space
66
To hepl identify rocks, geologist use the properties of
acids
False
True
67
When electrons are
transferred
between two atoms, a covalent bond is formed
False
True
68
A chemical reaction may be detected by observing cchanges in the
properties
of matter
False
True
69
Every chemical reaction involves a change in
energy
concentraction
state
mass
