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WorksheetsUnit 2 Chemical Reactions Review
Total questions: 53
Worksheet time: 43mins
Name
Class
Date
1.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
2.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
3.
How many total elements are in the compound C2H12O3?
a)
3
b)
17
c)
12
d)
2
4.
Which of the following elements is required in an organic compound?
a)
nitrogen
b)
oxygen
c)
carbon
d)
sodium
5.
The compound PO4 is...
a)
inorganic
b)
organic
6.
The compound CHO is...
a)
inorganic
b)
organic
7.
Is NaCl (table salt) a Organic or Inorganic Compound?
a)
Inorganic
b)
Organic
8.
Which compound is inorganic?
a)
Glucose (C₆H₁₂O₆)
b)
Ethane (C₂H₆)
c)
Carbon Dioxide (CO₂)
d)
Stearic Acid (C₁₈H₃₆O₂)
9.
All organic compounds contain the element
a)
carbon
b)
nitrogen
c)
phosphorus
d)
sulfur
10.
The one or two letters used to represent elements
a)
Yield sign
b)
Coefficient
c)
Symbol
d)
Subscript
11.
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
12.
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
13.
The arrow symbol used in a chemical equation
a)
Yield sign
b)
Subscript
c)
Coefficient
d)
Chemical formula
14.
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
15.
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
16.
The large number written in front of a chemical formula. It shows the number of molecules.
a)
Molecule
b)
Compound
c)
Coeffiecient
d)
Subscript
17.
How many Hydrogen atoms are in H2O?
a)
zero
b)
one
c)
two
d)
three
18.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
19.
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
20.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
21.
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
22.
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
23.
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
24.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
Fe + S --> FeS
a)
balanced
b)
unbalanced
25.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
26.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
27.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
28.
How many atoms and are in the chemical formula for water; H₂O (H2O)?
a)
2 atoms for Hydrogen; 1 atom for Oxygen
b)
2 atoms for Hydrogen; 2 atoms for Oxygen
c)
1 atom for Hydrogen; 1 atom for Oxygen
d)
None of the above
29.
What is Fe2O3
(rust) made up of?
(rust) made up of?
a)
1 flourine, 2 einsteinium,
3 oxygen
3 oxygen
b)
2 fluorine, 3 oxygen
c)
2 iron, 3 oxygen
d)
2 iron, 3 osmium
30.
You know you a chemical reaction has occurred if
a)
there is a precipitate.
b)
there is a color change.
c)
there is a temperature change.
d)
All of these answers are evidence.
31.
The substances you put together in a chemical reaction and are on the left side of an equation are called
a)
products.
b)
reactants.
c)
elements.
d)
compounds.
32.
The substances you get in a chemical reaction and are listed on the right side of a chemical equation are called
a)
products.
b)
reactants.
c)
elements.
d)
compounds.
33.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
34.
Are fireworks exploding a physical or chemical change?
a)
physical
b)
chemical
35.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
36.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
c)
liquid properties
d)
real properties
37.
B₂=3W₂---2BW₃
a)
Balanced
b)
Unbalanced
38.
If four hydrogen atoms react with two hydrogen atoms, how many atoms will be in the product?
a)
6
b)
4
c)
8
d)
2
39.
All chemical equations create or destroy matter, which is why scientists weigh their reactants so they can see how much was created or destroyed
a)
True
b)
False
40.
Which is Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
41.
PCl5 + ___ H2O → ___ HCl + H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
42.
__ Al + __ FeO → Al2O2 + __ Fe
a)
1, 1, 2
b)
2,1,2
c)
2, 2, 2
d)
2,4,2
43.
Mg + ___ HCl → MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
44.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
45.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
46.
Which units of measurement are used for volume?
a)
grams
b)
centimeters
c)
grams/milliliter
d)
milliliter
47.
Which units of measurement are used for volume?
a)
grams
b)
centimeters
c)
grams/milliliter
d)
milliliter
48.
What is the volume of Object X?
a)
10.0 cm3
b)
15.0 cm3
c)
20.0 cm3
d)
25.0 cm3
49.
What is the volume of 150 grams of lead if it has a density of 11.3 g/cm3?
a)
13.3 g
b)
13.3 cm3
c)
.075 g
d)
1695 cm3
50.
Find the volume of this piece of brass.
a)
50 g
b)
10 cm
c)
6 cm3
d)
12 cm3
51.
The density of this material is 2 g/cm3.
There are 24 cm3 Find the total mass.
There are 24 cm3 Find the total mass.
a)
12 grams
b)
48 grams
c)
12 g/cm3
d)
48 g/cm3
52.
Volume is ...
a)
Mass/Volume
b)
The amount of matter in an object.
c)
The amount of space an object occupies.
d)
Anything that has mass and occupies space.
53.
Density is...
a)
the amount of mass in an object
b)
the amount of space an object takes up
c)
the amount of mass in a given space
d)
the weight of an object
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