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WorksheetsChem Formulas
Total questions: 60
Worksheet time: 1hrs 4mins
Name
Class
Date
1.
Covalent bond is formed between atoms of ________
a)
A. metals and metals
b)
B. non-metals and non-metals
c)
C. metals and non-metrals
d)
D. metaliods and non-metals
2.
Bonding occurs because of the attractions of.......
a)
Protons
b)
Neutrons
c)
Electrons
3.
In a _________ bond the electrons share electrons
a)
Covalent
b)
Ionic
c)
Metallic
4.
Is salt (NaCI) a compound or a element
a)
Compound
b)
element
5.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
6.
made up of one or more of the same type of atom
a)
atom
b)
element
c)
molecule
d)
compound
7.
made up of two or more DIFFERENT atoms/elements chemically combined
a)
atom
b)
element
c)
molecule
d)
compound
8.
How many atoms/elements are in NO2?
a)
1
b)
2
c)
3
d)
4
9.
How many atoms/elements are in H3?
a)
1
b)
0
c)
2
d)
3
10.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
11.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
12.
Element or compound?
H2O
H2O
a)
element
b)
compound
13.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
14.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
15.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
16.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
17.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
18.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
19.
Element or compound?
O2
O2
a)
Element
b)
Compound
20.
A physical change is?
a)
It changes the object into something different
b)
Objects or substances undergo a change that does not change their chemical composition
c)
it is just like a chemical reaction
d)
Paper burning
21.
A chemical change is?
a)
a shoe lace cut in half
b)
doesn't change anything
c)
changes the look of an object
d)
change that results in the formation of new chemical substances
22.
The smallest physical unit of an element or compound (O2 and H2O are both examples of ONE of these)
a)
Physical change
b)
Chemical Symbol
c)
Yield Sign
d)
Molecule
23.
The arrow symbol used in a chemical equation
a)
Yield sign
b)
Subscript
c)
Coefficient
d)
Chemical formula
24.
A way to show the number and type of elements (atoms) in a molecule or compound with a combination of symbols and numbers.
a)
Molecule
b)
Chemical formula
c)
Physical change
d)
Coefficient
25.
The small number that is written below the symbol and shows how many atoms of each element is present.
a)
Compound
b)
Molecule
c)
Coefficient
d)
Subscript
26.
The large number written in front of a chemical formula. It shows the number of molecules.
a)
Molecule
b)
Compound
c)
Coeffiecient
d)
Subscript
27.
Black = Carbon (C)
White = Hydrogen (H)
What would be the formula for ethane?
White = Hydrogen (H)
What would be the formula for ethane?
a)
CH4
b)
CH6
c)
C2H2
d)
C2H6
28.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
29.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
30.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
31.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
32.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
33.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
34.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
35.
If there is no subscript, there is ______ atom(s) of that element.
a)
0
b)
2
c)
only 1
d)
1 million
36.
How many elements are present in this compound?
Mg2As3COHNi2
Mg2As3COHNi2
a)
2
b)
4
c)
6
d)
10
37.
How many molecules are in 10MgCl2?
a)
10
b)
2
c)
30
d)
13
38.
Which of these is an element?
a)
H2Cr
b)
Cr3
c)
OH
d)
PNi
39.
In this image, what are the symbols in red are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
40.
The law of conservation of mass states that....
a)
Matter can be created
b)
Matter is sometimes destroyed
c)
Matter cannot be created or destroyed
d)
Matter can be created but not destroyed
41.
In this image, the symbols to the right of the arrow (in black) are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
42.
Na + MgF2 --> NaF + Mg
What are the reactants?
What are the reactants?
a)
Na + MgF2
b)
Na
c)
NaF + Mg
d)
NaF
43.
NH3 ---> N2 + H2
What are the products?
What are the products?
a)
N2 + H2
b)
N2
c)
H2
d)
NH3
44.
A substance that undergoes a(n) _____ change becomes a new kind of substance.
a)
large
b)
physical
c)
chemical
d)
state of matter
45.
All of the following are chemical changes except
a)
iron rusting
b)
water evaporating
c)
wood burning
d)
food rotting
46.
According to the law of conservation of mass, if 5 grams of Oxygen completely reacted with 10 grams of Hydrogen, how many grams of water should be produced?
a)
5g
b)
10g
c)
15g
d)
20g
47.
Which equation is balanced?
a)
SO2 + 2H2--> H2SO4
b)
SO2 + H2O --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
2Na + 2H2O --> 2NaOH + H
48.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
49.
The formula below represents the most common carbohydrate known as glucose. Which information can be determined from the chemical formula?
C6H12O6
C6H12O6
a)
The structural arrangement of the atoms in a glucose molecule
b)
The color of a glucose molecule
c)
The size of a glucose molecule
d)
The number of atoms of each element in a glucose molecule
50.
For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?
The student inferred that a chemical reaction occurred. What evidence supports this inference?
a)
A dark solid formed on the zinc metal.
b)
The zinc metal remained silver-colored and shiny
c)
The CuSO4 solution turned blue when the zinc metal was added.
d)
None of these
51.
Which element is found in all of these compounds?
C3H6
H20
NaHCO3
CH3(OH)
C3H6
H20
NaHCO3
CH3(OH)
a)
Hydrogen
b)
Oxygen
c)
Sodium
d)
Carbon
52.
How many atoms of sodium are found in baking soda, NaHCO3?
a)
3
b)
1
c)
4
d)
2
53.
All of the following are indicators of a chemical change except --
a)
change in the state of matter
b)
formation of a gas
c)
change in temperature
d)
formation of a precipitate
54.
All of these are examples of a chemical compound except --
a)
H2
b)
MgO
c)
SiO2
d)
H2O
55.
Which two compounds contain the same total number of atoms?
a)
H2O and NaCl
b)
C2H6 and NaHCO3
c)
2CO and CO2
d)
CH4 and CaCO3
56.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
57.
A ________ bond forms when atoms give/take electrons.
a)
convergent
b)
covalent
c)
transform
d)
ionic
58.
Rule of eight: states that atoms are __________ when they have a complete outer energy shell.
a)
agitated
b)
restless
c)
unstable
d)
stable
59.
Another terms for a stable atom (has complete outer energy level) is ________.
a)
inert
b)
conservative
c)
covalent
d)
ionic
60.
To calculate the number of atoms of an element in a chemical formula we:
a)
add the coefficients and subscripts
b)
multiply coefficient by subscript
c)
divide coefficient by subscript
d)
subtract coefficients and subscripts
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