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Chemistry Final Exam
Chemistry Final Exam
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Questions
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Answers
1
What is an empirical formula?
The mass formula
A reaction equation
The simplest ratio of atoms
The full formula of a compound
2
What type of electromagnetic radiation has the highest energy?
Infrared
Gamma rays
Radio waves
Ultraviolet
3
What is the name of CCl₄?
Carbon tetrachloride
Tetracarbon chloride
Calcium chloride
Carbon chloride
4
What is the octet rule?
Atoms gain or lose 8 protons
Atoms want 8 electrons in their outer shell
All atoms form 8 bonds
Only noble gases follow this
5
What do groups on the periodic table tell us?
Number of valence electrons
Number of protons
Atomic mass
Energy levels
6
What is ionization energy?
Energy to create a nucleus
Energy released when atoms bond
Energy needed to remove an electron
Energy lost by an ion
7
What is an ion?
A radioactive atom
An atom with more protons
A neutral atom
An atom that gained or lost electrons
8
Which trend increases across a period and decreases down a group?
Ionization energy
Atomic radius
Mass number
Reactivity
9
What is the formula of Iron (III) chloride?
FeCl
Fe₃Cl
FeCl₃
FeCl₂
10
What is atomic radius?
Distance from nucleus to outermost electron
The size of the nucleus
Mass of an atom
Number of protons
11
What is frequency in terms of light?
Height of the wave
Speed of the wave
Distance between peaks
Number of waves per second
12
How many valence electrons does sulfur (S) have?
4
6
8
2
13
What is percent composition?
Number of moles
% of each element in a compound
Type of reaction
% of atoms in a mixture
14
Which color of visible light has the longest wavelength?
Blue
Purple/violet
Green
Red
15
Why do we balance chemical equations?
To satisfy conservation of mass
To reduce atoms
To show correct atomic mass
To follow the octet rule
16
What type of bond is formed between a metal and a nonmetal?
Metallic
Covalent
Ionic
Hydrogen
17
What is a photon?
A particle with mass
A type of wavelength
A particle of light energy
A radioactive element
18
What is electronegativity?
Ability to attract electrons in a bond
Number of protons
Mass of the nucleus
Tendency to lose electrons
19
What is orbital notation?
A visual of atom bonding
A summary of atomic number
Electron arrangement using arrows in orbitals
A way to show ions
20
What is a molecular bond (covalent)?
A metallic bond
Between ions
Sharing of electrons between nonmetals
Transfer of electrons
21
What is wavelength?
Speed of a wave
Distance between wave peaks
Time for a wave to pass
Size of the wave
22
What is a chemical formula?
The valence electron count
A word description of a compound
A lab procedure
The ratio of atoms in a molecule
23
What are the 7 diatomic elements?
H, N, O, F, Cl, S, P
H, O, N, C, Cl, Br, F
H, He, O, N, F, Ne, Cl
H, N, O, F, Cl, Br, I
24
What does the prefix “tetra-” mean in chemical naming?
Four
Three
Two
Five
25
What is a mole in chemistry?
The number of protons
The atomic number
Mass in grams
6.02 × 10²³ particles
26
What is a polyatomic ion?
A lone pair of electrons
A neutral molecule
A molecule with different elements
A charged group of atoms
27
What is a limiting reactant?
The smallest molecule
The reactant that is leftover
The one added in excess
The one used up first in a reaction
28
What type of reaction is: A + B → AB?
Single replacement
Synthesis
Combustion
Decomposition
