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Worksheetsbalancing eq and mass
Total questions: 36
Worksheet time: 46mins
Name
Class
Date
1.
____P4 + ____ O2 yields P4O6. Balance this equation
WHAT ARE THE COEFFICIENTS?
WHAT ARE THE COEFFICIENTS?
a)
1,1,1
b)
1,3,1
c)
3,1,1
2.
____C + ____ H2 yields CH4. Balance this equation
WHAT ARE THE COEFFICIENTS?
WHAT ARE THE COEFFICIENTS?
a)
1,1,1
b)
1,2,1
c)
1,1,2
3.
___Zn + ___HCl yields ____ZnCl2 + ____ H2. Balance this equation
WHAT ARE THE COEFFICIENTS?
WHAT ARE THE COEFFICIENTS?
a)
1,1,1
b)
1,2,1,3
c)
1,2,1,1
4.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
5.
Which is Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
6.
B₂ + 3W₂ => 2BW₃
a)
Balanced
b)
Unbalanced
7.
Which are chemical changes
a)
Iron rusting
b)
Glass breaking
c)
Clothing ripping
d)
Hair cut
8.
Molecule
a)
A group of atoms bonded together
b)
Basic unit of a chemical element
c)
Coefficient
d)
Subscript
9.
Can matter be created or destroyed?
a)
Yes, it can be created.
b)
Yes, it can be destroyed.
c)
No, matter is always conserved
d)
None of these
10.
What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
11.
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
12.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
13.
If there is no subscript, there is ______ atom(s) of that element.
a)
0
b)
2
c)
only 1
d)
1 million
14.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
15.
How many atoms of Oxygen are in this compound?
a)
1
b)
2
c)
3
d)
4
16.
How many atoms are in the element Carbon in this compound?
H2C3O4N5
H2C3O4N5
a)
2
b)
3
c)
4
d)
5
17.
How many TOTAL atoms are in this compound?
H2C3O4N5
H2C3O4N5
a)
5
b)
14
c)
15
d)
19
18.
How many elements are present in this compound?
Mg2As3COHNi2
Mg2As3COHNi2
a)
2
b)
4
c)
6
d)
10
19.
Which of these is NOT a compound?
a)
H2Cr
b)
Cr3
c)
OH
d)
PNi
20.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
21.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
22.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
23.
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
24.
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
25.
Which equation obeys the law of conservation of mass?
a)
H2 + O2 ------> H20
b)
C + 2H2 ----> CH4
c)
2Fe2O3 ------> 2O2 + 4Fe
26.
5CO2
How many molecules are there? How many elements?
How many molecules are there? How many elements?
a)
5 molecules, 2 elements
b)
2 elements, 5 molecules
c)
10 atoms, 5 elements
d)
15 elements, 2 molecules
27.
In a chemical reaction, everything to the rightof the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
28.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
29.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
30.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
31.
What is the balanced equation when aluminum reacts with copper(II) sulfate to produce aluminum sulfate and copper?
a)
Al + Cu2S →Al2S + Cu
b)
2Al + 3CuSO4 → Al2(SO4)3 + 3Cu
c)
Al + CuSO4 → AlSO4 + Cu
d)
2Al + Cu2SO4 → Al2SO4 + 2Cu
32.
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
33.
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
34.
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
35.
Element or compound?
O2
O2
a)
Element
b)
Compound
36.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
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