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WorksheetsChemistry Quest
Total questions: 73
Worksheet time: 18hrs 15mins
Name
Class
Date
1.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
2.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
3.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
4.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
5.
What is the little number after an element in a chemical equation called.
Example: H2
Example: H2
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
6.
What is the arrow in a chemical equation...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
7.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
8.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
9.
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
10.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
11.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
12.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
13.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
14.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
15.
Which elements are(is) not balanced?
LiNO3 +CaBr2 --> Ca(NO3)2 + LiBr
LiNO3 +CaBr2 --> Ca(NO3)2 + LiBr
a)
Li
b)
Ca and Li
c)
O and N
d)
Ca
16.
Which of the following has the most number of O?
a)
2Mg3(PO4)2
b)
4AlPO4
c)
3Al(NO3)3
d)
15KOH
17.
N2 + H2 = NH4
a)
Balanced
b)
Unbalanced
18.
How many F atoms are in this compound?
6MgF2
6MgF2
a)
2
b)
6
c)
8
d)
12
19.
How many Al atoms are in this compound? 4Al2O3
a)
2
b)
8
c)
6
d)
4
20.
Is this balanced?...
Fe + S --> FeS
Fe + S --> FeS
a)
YES!
b)
NO!
21.
Is this balanced?...
Al + O2 --> 2Al2O3
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
22.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
23.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
24.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
25.
Which of the following is evidence of a chemical reaction?
a)
fizzing
b)
water changing to ice
c)
saltwater
d)
paper being cut in half
26.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
60
27.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
28.
What is a reactant?
a)
The chemical substances that begin the reaction.
b)
What comes from the reaction.
29.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
30.
What is a chemical equation?
a)
A short way to show a chemical reaction using symbols
b)
A way to explain a chemical reaction using words
31.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
32.
How many ELEMENTS are there TOTAL in:
H2SO4
H2SO4
a)
3
b)
2
c)
7
d)
8
33.
C2H4+H2 -->C2H6
a)
Balanced
b)
Unbalanced
34.
Ca + O2 -->CaO
a)
Unbalanced
b)
Balanced
35.
Is this equation balanced?: CS2 + 202 --> CO2 +2SO2
a)
Yes
b)
No
36.
2 H2+O2 --> 2 H2O
a)
Unbalanced
b)
Balanced
37.
Which of the following is a PHYSICAL change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
38.
Which problem is balanced?
a)
PbO2 + 2H2
b)
So2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
39.
Which of the following could indicate a chemical change?
a)
All of the answers could indicate Chemical Change
b)
a color change has occurred
c)
bubbles appear
d)
identifying one or more new chemical products
40.
Which of the following IS a chemical change
a)
using chalk
b)
water freezing
c)
slicing cheese
d)
digestion
41.
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
42.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
43.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
44.
What is an example of a Chemical change?
a)
Ripped paper
b)
boiled egg
c)
cracked egg
d)
sugar in water
45.
Which is a chemical change?
a)
freezing fruit juice
b)
slicing a potato
c)
boiling water
d)
copper metal turning green
46.
Which one is NOT a sign that a chemical reaction has occurred?
a)
precipitate
b)
energy change
c)
unexpected color change
d)
dissolving
47.
The law of conservation of mass states that....
a)
Mass can be created
b)
Mass can be destroyed
c)
Mass cannot be created or destroyed
d)
Mass is the same as matter
48.
Which of the following is an UNBALANCED equation? Careful!
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
49.
Is this equation Balanced?
Careful!
Careful!
a)
Yes!
b)
No!
50.
Which one is our current TEKS?
a)
Recognize whether a chemical equation is balanced and how that relates to the Law of Conservation of Mass.
b)
Investigate how evidence of chemical reactions indicate that new substances with different properties are formed.
c)
Recognize that chemical formulas are used to determine the number of atoms in a substance.
51.
Look at the word wall. Which word is a sign of a chemical reaction?
a)
compound
b)
reactancts
c)
precipitate
d)
coefficient
52.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
53.
2H2 + O2 --------> 2H2O What are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
54.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
55.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
56.
(Element or Compound)
C2H8O
C2H8O
a)
Element
b)
Letters
c)
Numbers
d)
Compound
57.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
58.
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
59.
Is this balanced?...
Al + O2 --> 2Al2O3
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
60.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO
N2+O2--> _NO
a)
1
b)
2
c)
3
d)
4
61.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
62.
Which equation is balanced?
a)
3 P4+1 O2 ---> 2 P2O3
b)
1 P4+1 O2 ---> 2 P2O3
c)
1 P4+ 3 O2 ---> 2 P2O3
d)
1 P4+ 2 O2 ---> 3 P2O3
63.
Which equation is balanced?
a)
1 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
b)
2 Na3PO4+2 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
c)
1 Na3PO4+2 KOH
--->
2 NaOH + 1 K3PO4
--->
2 NaOH + 1 K3PO4
d)
3 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
64.
Which equation is balanced?
a)
1 BaS + 1 PtF2
--->
1 BaF2 + 1 PtS
--->
1 BaF2 + 1 PtS
b)
4 BaS + 2 PtF2
--->
1 BaF2 + 1 PtS
--->
1 BaF2 + 1 PtS
c)
1 BaS + 2 PtF2
--->
2 BaF2 + 2 PtS
--->
2 BaF2 + 2 PtS
d)
1 BaS + 3 PtF2
--->
1 BaF2 + 2 PtS
--->
1 BaF2 + 2 PtS
65.
How many atoms of Fe are on the products side?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
1
b)
2
c)
3
d)
4
66.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
67.
How many atoms of lead (Pb) are in Pb(NO₃)₂?
a)
1
b)
2
c)
3
d)
6
68.
How many TOTAL atoms are in 2H2SO4
a)
2
b)
4
c)
7
d)
14
69.
How many TOTAL atoms are in 2CaO2
a)
2
b)
3
c)
5
d)
6
70.
How many ATOMS of Carbon are in 3C2H4O
a)
2
b)
3
c)
4
d)
6
71.
How many ELEMENTS are in the compound H2O
a)
1
b)
2
c)
3
d)
4
72.
How many ELEMENTS are in the compound O2
a)
1
b)
2
c)
3
d)
4
73.
What does the arrow in a chemical equation say to us as chemists?
H2 + O --> H2O
a)
Reactants
b)
Products
c)
"Makes" or "Yields"
d)
Chemical Equation
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