WorksheetsCHEM FINAL
Total questions: 50
Worksheet time: 13hrs 30mins
What is density?
The amount of space something occupies
The amount of mass something has
The ratio of mass relative to the space occupied
Intelligence level
The answer to following will be precise to what place value: 10. + 1.2 + .111
tens
ones
tenths
hundredths
How many significant figures would the product of the following numbers have: 202 x 20 x 40.121
1
2
3
4
5
How many significant figures are there in the number 0.0100?
1
2
3
4
5
What is the product of 2.3 and 20?
46
50
40
50.
What is the sum of 3, 5.30, and 5.2?
13.50
13.5
14
13
What is the density of a cube with a side of 5.0 cm and and a mass of 30. g? (include the correct amount of sig figs, but omit the units)
150
.24
150.
.2
What is (1.20 x 103) x (3.2 x 102)?
3.84x105
3.84x106
3.8x105
3.8x106
How many nanometers is 2.54 km? ( 1 km = 1000 m, 1 m = 1,000,000,000 nm)
2.54 x 1012 nm
2.54 x 109 nm
2.54 x 10-9 nm
2.54 x 10-12 nm
How many feet are there in 120 meters? (1m = 100 cm, 1 inch = 2.54 cm, 12 inches = 1 foot)
390 ft
393 ft
4716 ft
394 ft
How many miles are there in .012 meters? (1 m = 100 cm, 1 inch = 2.54 cm, 12 inches = 1 foot, and 1 mile =5280 feet)
7.45x10-6 miles
7.4x10-6 miles
7.5x10-6 miles
7.45x106 miles
Which target demonstrates high precision, but low accuracy?
A
B
C
D
Which subatomic particle can be found inside the nucleus?
electron
proton
neutron
both proton and neutron
If a nitrogen atom gained three electrons to have a full valence shell, what charge would it have?
+3
-3
+1
-1
Which elements will have similar properties?
H, He, Li
N, P, As
B, C, N
Al, Zn, Ag
How many electrons can fit in the first energy shell which fills the valence shell for a helium atom?
1
2
8
6
What is the atomic number of the element Fe?
56
26
8
9
Chlorine has two isotopes- Chlorine-35 and chlorine-36. If the average atomic mass is about 35.5, what does this tell us about these isotopes?
There is significantly more Chlorine-36 naturally
They exist in roughly equal amounts in nature
There is significantly more Chlorine-35 naturally
There must be a third isotope, Chlorine-34, that exists in the highest quantity
Which energy level would be occupied by electrons with the LEAST amount of energy?
E1
E2
E3
E4
What is the symbol for this element?
C
Be
N
P
Why are valence electrons so important in chemistry?
Valence electrons are the subatomic particles that interact with other atoms
Valence electrons are the only electrons that enter the nucleus
There are typically more valence electrons than any other type of electron
Valence electrons are the only electrons that can turn into protons
What is the symbol of the element whose atom contains 12 electrons, 8 neutrons, and a mass of 14 AMU's ?
Be
C
P
N
What is the atomic mass of an atom that has a neutral charge, 11 electrons, and 13 neutrons?
2
24
15
35
What is an isotope?
an atom with a different number of electrons than protons
a radioactive element
a version of an element with a different amount of neutrons
How many UNPAIRED, or lone, electrons does the Lewis structure for Nitrogen have?
1
2
3
4
How many PAIRED electrons does the Lewis structure for Nitrogen have?
1
2
3
4
What type of chemical bond does carbon dioxide have?
ionic
covalent
metallic
What is happening to the electrons in an ionic bond?
The cation is transferring its electrons to the anion in order for the elements to meet the octet rule
The positive charge of cation's nucleus attracts the valence electrons of the anion
Two non-metals share electrons in order to meet the octet rule unevenly
Two non-metals share electrons in order to meet the octet rule evenly
What is happening to the electrons in a covalent bond?
The cation is transferring its electrons to the anion in order for the elements to meet the octet rule
The positive charge of cation's nucleus attracts the valence electrons of the anion
Two non-metals share electrons in order to meet the octet rule unevenly
Two non-metals share electrons in order to meet the octet rule evenly
What type of chemical bond does lithium chloride have?
ionic
covalent
metallic
What is the chemical formula for silver nitrate?
Ag(NO3)2
Ag2(NO3)
AgNO3
AgN
What is the chemical formula for tetracarbon heptaoxide?
C3O5
C4O6
C4O7
C4O3
Which polyatomic ion has a charge of -3?
acetate
sulfide
sulfate
phosphate
When naming compounds, a bond between which two types of compounds will use prefixes?
metal and metal
metal and non-metal
non-metal and non-metal
transition metal and non-metal
How many valence electrons do elements in Group 17 of the periodic table have?
1
2
3
7
Which is the correct formula and charge of dichromate?
CrO4-1
C2H3O2-1
Cr2O7-2
Cr2O7-1
What is the name of MgCl2?
magnesium dichlorine
magnesium dichloride
monomagnesium dichlorine
magnesium chloride
Which is the correct formula and charge of nitrate?
NO3+1
NO3-1
NO2-1
NO2+1
What is the name of the following polyatomic ion C2H3O2-1
acetate
oxalate
permanganate
cyanide
What is the molar mass of 1 mole of C to the nearest hundredth?
12
1 amu
12.01
6.00
What is the molar mass of H2O?
37.01
18.02
1.01
16.00
What is the molar mass of CO3?
59.99
60.01
60.10
What is the molar mass of lithium carbonate?
73.89
54.23
How many moles is 212 g of H2O?
11
12
11.8
11.76
How much does 3.34 moles of H2O weigh?
60 g
60. g
60.2 g
What is the mole to mole ratio of Mg to O2 , in the balanced equation of 2 Mg + O2 --> 2 MgO
1 to 1
2 to 1
1 to 2
2 to 2
In the balanced equation of 2 Mg + O2 --> 2 MgO, if there are 25 mol of Mg and 15 mol of O2, which is the limiting reactant?
Mg
O2
MgO
In the balanced equation of 2 Mg + O2 --> 2 MgO, if 25.30 g of Mg reacted, how many moles of O2 reacted?
0.5204
0.7021
2.308
0.702
0.52
In the balanced equation of 2 Mg + O2 --> 2 MgO, if 75 g of O2 reacted, how many grams of MgO were produced?
189.78
42.0
190
3.11
75.8
In the balanced equation of 2 Mg + O2 --> 2 MgO, if the reaction produced 123.0 g of MgO, how many grams of O2 reacted?
50
50.
49.0
48.82
24.41
