Chemistry Final Review

Test your knowledge on fundamental concepts of chemistry with questions ranging from atomic structure to chemical reactions.

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Questions 19

Answers

1
Physical change differs from chemical change by?
No new substance
Color always changes
Energy is released
New substance forms
2
What are the two types of pure substances?
Liquids and gases
Mixtures and solutions
Elements and compounds
Solids and liquids
3
What is the atomic number of bromine?
80
17
45
35
4
Coefficients in equations represent number of?
Atoms
Molecules
Protons
Electrons
5
Correct formula for lithium bromide?
Li2Br
LiBr2
LiBr3
LiBr
6
A neutral atom with 9 electrons has atomic number?
8
10
18
9
7
Heterogeneous mixtures have what characteristic?
Only gases
Pure substances
Uniform throughout
Different parts visible
8
Where are electrons located in an atom?
In neutrons
In protons
Outside nucleus
Inside nucleus
9
Increasing O2 shifts reaction direction how?
Right
Left
Equilibrium
No change
10
In ionic bonds, electrons are?
Shared unequally
Transferred
Not involved
Shared equally
11
Balance: Na + I2 → NaI. Coefficients?
2,1,2
1,1,1
1,2,2
2,2,1
12
Most stable elements have how many outer electrons?
6
2
4
8
13
Which group has 1 electron in outer shell?
Noble gases
Alkali metals
Alkaline earth metals
Halogens
14
What metric unit measures mass?
Meter
Gram
Mole
Liter
15
Why do atoms form chemical bonds?
To change color
To achieve stability
To increase size
To lose mass
16
Which best describes a homogeneous mixture?
Visible parts
Layered substances
Uniform composition
Different phases
17
Metals are generally characterized by?
Poor conductors
Good conductors
Dull appearance
Brittle solids
18
Boyle’s Law states pressure and volume are inversely related.
False
True
19
What charge does a proton have?
Positive
Variable
Neutral
Negative

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