What is the difference between an endothermic and an exothermic reaction?

An endothermic reaction absorbs heat., An exothermic reaction releases heat.

Which type of reaction is this?

endothermic because heat is absorbed

An example of a chemical change is

the effect of acid rain on a statue., burning a piece of paper.

Physical act of separating out larger particles of solute

brass, salt water, air are all

solutions, homogeneous mixtures

A homogeneous mixture of 2 or more elements., A solid solution of metals or nonmetals dissolved in metals.

can also be described as a homogeneous mixture

are in group 1, have one electron in the outer shell

What occurs during a chemical reaction?

Atoms of 2 or more elements bond together

Usually a substance is more soluble when

when the amount of solvent is increased, the temperature is increased

What is the difference between a heterogeneous and a homogeneous mixture?

Homogeneous has particles that are all the same throughout, Heterogeneous has particles that you can easily identify

What is a diluted solution?

when the solvent can dissolve much more solute

When a solute is completely dissolved in a solvent

Dry ice is solid carbon dioxide with a chemical formula of CO2

Dry ice is a pure substance because it is chemically bonded together.

What is true of a compound?

It may not retain the properties of the reactants

Which of the following is NOT part of the definition of a mixture?

A combo of 2 or more substances that are chemically combined

What is a saturated solution?

when the solvent cannot dissolve any more solute

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Chemistry

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A review of the periodic table and associated Chemistry labs

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Questions 52

Answers

1
Which of the following is an example of a chemical element?
salt
sugar
water
sodium
2
How many neutrons does Cobalt have if it has atomic number 27 and atomic mass 58.9?
58.9
86
32
27
3
This is the substance being dissolved
solution
solute
saturated solution
solvent
4
Which of the following speeds up a reaction?
none of the answers
indicator
catalyst
inhibitor
5
What is the difference between an endothermic and an exothermic reaction?
An exothermic reaction absorbs heat.
An endothermic reaction absorbs heat.
An exothermic reaction releases heat.
An endothermic reaction releases heat.
6
Which type of reaction is this?
endothermic because heat is absorbed
exothermic because heat is released
exothermic because heat is absorbed
endothermic because heat is released
7
An example of a chemical change is
the effect of acid rain on a statue.
burning a piece of paper.
the melting and refreezing of an ice cube.
tearing a piece of paper.
8
What is the mass of this object?
444g
440.4g
444.4g
444.0g
9
How many protons does Cobalt have if it has atomic number 27 and atomic mass 58.9?
32
58.9
27
86
10
What is filtration?
Physical act of separating out larger particles of solute
Process of dissolving a solute in a solvent
Raising the temperature so that a solute will dissolve
Chemical act of separating out larger particles of solute
11
brass, salt water, air are all
heterogeneous mixtures
solutions
elements
homogeneous mixtures
12
What is an alloy?
A heterogeneous mixture of 3 or more elements.
A homogeneous mixture of 2 or more elements.
A liquid solution of metals dissolved in acids.
A solid solution of metals or nonmetals dissolved in metals.
13
How many electrons does Cobalt have if it has atomic number 27 and atomic mass 58.9?
58.9
32
86
27
14
If red litmus paper stays red and blue litmus paper stays blue then the substance
is neutral
is an acid
is both an acid and a base
is a base
15
An example of a suspension is
copper
mud in water
salt in water
NaCl
16
A solution
can also be described as a homogeneous mixture
can also be described as a heterogeneous mixture
is always a chemical change
is when the solvent is completely dissolved
17
Alkali metals
are in group 18
are in group 1
are also called noble gases
have one electron in the outer shell
18
What occurs during a chemical reaction?
Atoms of 2 or more elements oppose one another
Atoms of 2 or more elements are destroyed
Atoms of 2 or more elements bond together
Atoms of 2 or more elements trade protons
19
Which compound is the most soluble in water?
KCl
KNO3
They are all equally soluble
NaCl
20
Purple cabbage paper turns green in
a base
an acid
a neutral liquid
pH 4
21
What is the correct order of the pictures?
suspension, solution, element
colloid, suspension, element
solution, colloid, element
Compound, suspension, element
22
Milk is a very weak acid. What might its pH level be?
4.2
7.8
12.2
6.5
23
The noble gases are
in column 17
are in column 18
are very reactive
are in period 18
24
50g of KCl at 80^oC is?
unsaturated
saturated
dilute
supersaturated
25
An acid
usually tastes sweet
usually feels slippery
usually tastes sour or bitter
has a pH higher than 7
26
An example of a compound is
copper
salt in water
mud in water
NaCl
27
Which of the following problems are correctly balanced? KClO₃ = KCl + O₂
2KClO3 = 4KCl + 3O2
3KClO3 = 3KCl + 6O2
2KClO3 = 2KCl + 3O2
KClO3 = KCl + 3O2
28
Usually a substance is more soluble when
the amount of solvent is decreased
when the amount of solvent is increased
the temperature is increased
the temperature is decreased
29
What is the difference between a heterogeneous and a homogeneous mixture?
Homogeneous has particles that are all the same throughout
Heterogeneous has particles that you can easily identify
Homogeneous has particles that you can easily identify
Heterogeneous has particles that are all the same.
30
An example of a colloid is
mud in water
copper
salt in water
fog
31
Which is a stronger acid?
8
13
4
1
32
What is a diluted solution?
when the solvent cannot dissolve any more solute
when the solvent can dissolve much more solute
when the solute cannot dissolve any more solvent
when the solute can dissolve much more solvent
33
An example of a physical change is
the effect of acid rain on a statue.
burning a piece of paper.
tearing a piece of paper.
the souring of a glass of milk.
34
What does this tool measure?
length
volume
weight
mass
35
What is a solution?
When a solute is mostly dissolved but not completely
When a solvent is completely dissolved in a solute.
When the particles are too dense and settle to the bottom
When a solute is completely dissolved in a solvent
36
How many grams of KCl can be dissolved at 100^oC ?
39g
20g
200g
58g
37
what is the length of line B?
29mm
2.9 inches
29cm
2.9mm
38
Which of the following 2 ingredients can combine to make a compound?
eggs and butter
hydrogen and oxygen
sugar and water
salt and water
39
what is the length of line A?
1.5cm
15cm
1.5 inches
1.5mm
40
Dry ice is solid carbon dioxide with a chemical formula of CO2
Dry ice is a mixture because the elements are just blended but not bonded.
Dry ice is a pure substance because it is chemically bonded together.
Dry ice is a mixture because it is on the periodic table of elements.
Dry ice is a mixture because it is chemically bonded together.
41
Which of the following problems are correctly balanced? P + O₂ = P₂O₅
4P + 5O2 = 4P2O5
4P + 5O2 = 2P2O5
2P + 2O2 = 2PO5
2P + 5O2 = P2O5
42
Purple cabbage paper turns pink in
a neutral liquid
a base
pH 4
an acid
43
What is the mass of this object?
373g
303.7g
370.3g
373.4g
44
What is true of a compound?
It requires electrical energy to make
It requires heat energy to make
It may not retain the properties of the reactants
It must have water as one of its components
45
what is the solvent in a glass of lemonade?
lemons
water
glass of lemonade
sugar
46
What kind of solution has the maximum amount of solute dissolved in a solvent?
a heterogeneous solution
a dilute solution
a concentrated solution
a saturated solution
47
How much more soluble is KCl than NaCl at 100^oC ?
200g
58g
39g
20g
48
A base
all of the choices
has a pH higher than 7
turns litmus paper blue
usually feels slippery
49
Every element in the same column,
has the same number of electron shells
has one electron in the outer shell.
is very reactive
behaves the same way.
50
Which of the following is NOT part of the definition of a mixture?
No definite ratio of combined substances
A combo of 2 or more substances that are chemically combined
A combo of 2 or more substances that are physically combined
It retains the properties of the substances that make it up
51
What is a saturated solution?
when the solvent can dissolve much more solute
when the solute can dissolve much more solvent
when the solute cannot dissolve any more solvent
when the solvent cannot dissolve any more solute
52
Every element in the same row,
has the same number of electron shells
behaves the same way.
has one electron in the outer shell.
is very reactive

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