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Balancing Equations Quiz - 4th period

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Question 1
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Q. Balance this equation...
HgO --> 2Hg + O₂
answer choices
It is balanced
2HgO --> Hg + O₂
2HgO --> 2Hg + O₂
It is balanced
alternatives
2HgO --> Hg + <sub></sub>O<sub>2</sub>
2HgO --> 2Hg + O<sub>2</sub>
answer explanation
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Question 2
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Balance this equation...
Sb₂S₃ + O₂ --> Sb + SO₂
answer choices
It is balanced
Sb₂S₃ + 3O₂ --> 2Sb + 3SO₂
Sb₂S₃ + O₂ --> 2Sb + SO₂
What is Sb?
<p>It is balanced</p>
alternatives
<p>Sb<sub>2</sub>S<sub>3</sub> + 3O<sub>2</sub> --> 2Sb + 3SO<sub>2</sub></p>
<p>Sb<sub>2</sub>S<sub>3</sub> + O<sub>2</sub> --> 2Sb + SO<sub>2</sub></p>
<p>What is Sb? </p>
answer explanation
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Question 3
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Q. Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃
answer choices
4Fe + 3O₂ -> 2Fe₂O₃
2 Fe + 3O₂ -> Fe₂O₆
4 Fe + O₆ -> 2Fe₂O₃
None of the options are correctly balanced.
4Fe + 3O<sub>2</sub> -> 2Fe<sub>2</sub>O<sub>3</sub>
alternatives
2 Fe + 3O<sub>2</sub> -> Fe<sub>2</sub>O<sub>6</sub>
4 Fe + O<sub>6</sub> -> 2Fe<sub>2</sub>O<sub>3</sub>
None of the options are correctly balanced.
answer explanation
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Question 4
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Which of the following correctly balances this equation:
Sodium phosphate and potassium hydroxide will produce sodium hydroxide and potassium phosphate.
answer choices
1 Na₃PO₄+3 KOH
--->
3 NaOH + 1 K₃PO₄
2 Na₃PO₄+2 KOH
--->
3 NaOH + 1 K₃PO₄
1 S₃PO₄+3 SOH
--->
3 SOH + 1 K₃PO₄
3 Na₃P+3 KO₂H
--->
3 NaH₂O + 1 K₃P
<p>1 Na<sub>3</sub>PO<sub>4</sub>+3 KOH </p><p>---> </p><p>3 NaOH + 1 K<sub>3</sub>PO<sub>4</sub></p>
alternatives
<p>2 Na<sub>3</sub>PO<sub>4</sub>+2 KOH </p><p>---> </p><p>3 NaOH + 1 K<sub>3</sub>PO<sub>4</sub></p>
<p>1 S<sub>3</sub>PO<sub>4</sub>+3 SOH </p><p>---> </p><p>3 SOH + 1 K<sub>3</sub>PO<sub>4</sub></p>
<p>3 Na<sub>3</sub>P+3 KO<sub>2</sub>H </p><p>---> </p><p>3 NaH<sub>2</sub>O + 1 K<sub>3</sub>P</p>
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Question 5
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Q.
What coefficient belongs with HCl?
Mg + ___ HCl → MgCl₂ + H₂
answer choices
1
2
3
4
<p>1</p>
alternatives
<p>2</p>
<p>3</p>
<p>4</p>
answer explanation
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Question 6
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Q. Balance this equation:
2Li + Cl₂ -> LiCl
answer choices
2Li + Cl₂ -> 4LiCl2
2Li + Cl₂ -> LiCl₂
2Li + Cl₂ -> 2LiCl
2Li + Cl<sub>2</sub> -> 4LiCl2
alternatives
2Li + Cl<sub>2</sub> -> LiCl<sub>2</sub>
<sub></sub>2Li + Cl<sub>2</sub> -> 2LiCl
answer explanation
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Question 7
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Q.
Which coefficients will correctly balance this equation:
_Al +_HCl --> _H₂+_AlCl₃
answer choices
2, 6, 3, 2
it is already balanced
4, 12, 3, 4
2, 1, 4, 5
<p>2, 6, 3, 2</p>
alternatives
<p>it is already balanced</p>
<p>4, 12, 3, 4</p>
<p>2, 1, 4, 5</p>
answer explanation
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Question 8
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Q.
Choose the coefficients that will correctly balance this equation.
_CH₄ + _O₂--> _CO₂+ _H₂O
answer choices
1,2,1,1
2,1,2,1
1,2,1,2
0,2,0,2
<p>1,2,1,1</p>
alternatives
<p>2,1,2,1</p>
<p>1,2,1,2</p>
<p>0,2,0,2</p>
answer explanation
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Question 9
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Q. What is the left part of a chemical equation called...
H_{2 +}O --> H₂O
answer choices
Reactants
Products
Yields
Chemical Equation
Reactants
alternatives
Products
Yields
Chemical Equation
answer explanation
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Question 10
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Q. KClO₃ --> KCl + O₂
What coefficient would go in front of KCl?
answer choices
1
2
3
4
1
alternatives
2
3
4
answer explanation
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Question 11
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Q. BaF₂ + K3PO₄ --> Ba₃(PO₄)₂ + KF
What coefficient goes in front of K₃PO₄?
answer choices
1
2
3
4
1
alternatives
2
3
4
answer explanation
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Question 12
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Q.
Which type of chemical reaction forms Carbon Dioxide and Water?
answer choices
Double Replacement
Single Replacement
Combustion
Decomposition
<p>Double Replacement</p>
alternatives
<p>Single Replacement</p>
<p>Combustion</p>
<p>Decomposition</p>
answer explanation
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Question 13
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Q. Name this reaction: 2Ca + O₂ --> 2CaO
answer choices
Decomposition
Synthesis
Double Replacement
Combustion
Decomposition
alternatives
Synthesis
Double Replacement
Combustion
answer explanation
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Question 14
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Q. Balance this equation:
___NH₃ + ___O₂ --> ___NO + ___H₂O
answer choices
4NH₃ + 5O₂ --> 4NO + H₂O
It's already balanced.
4NH₃ + 5O₂ --> 4NO + 6H₂O
4NH<sub>3</sub> + 5O<sub>2</sub> --> 4NO + H<sub>2</sub>O
alternatives
It's already balanced.
4NH<sub>3</sub> + 5O<sub>2</sub> --> 4NO + 6H<sub>2</sub>O
answer explanation
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Question 15
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Q. ____ P₄ + ____ O₂ --->____ P₂O₃
answer choices
1,3,2
1,1,1
1,2,3
2,1,2
1,3,2
alternatives
1,1,1
1,2,3
2,1,2
answer explanation
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Question 16
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Q. Which type of reaction is:
2 NaBr + Ca(OH)₂ → CaBr₂ + 2 NaOH
answer choices
Synthesis
Single Displacement
Double Displacement
Combustion
Synthesis
alternatives
Single Displacement
Double Displacement
Combustion
answer explanation
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Question 17
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Q. Fill in the blanks with coefficient:
PCl₅+_ H₂O→_ HCl+H₃PO₄
answer choices
4, 5
1, 6
3, 8
2,2
4, 5
alternatives
1, 6
3, 8
2,2
answer explanation
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Question 18
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Q. The red numbers in the image below represent ________
answer choices
subscripts
coefficients
I don't know, and don't want to try
None of the answers are correct
subscripts
alternatives
coefficients
I don't know, and don't want to try
None of the answers are correct
answer explanation
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Question 19
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Q. How many O's are in Al₂(SO₄)₃
answer choices
4
12
7
24
4
alternatives
12
7
24
answer explanation
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Question 20
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Q.
What is the right part of a chemical equation called...
H_{2 +}O₂ --> H₂O
answer choices
Reactants
Products
Yields
Chemical Equation
<p>Reactants</p>
alternatives
<p>Products </p>
<p>Yields </p>
<p>Chemical Equation </p>
answer explanation
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Question 21
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Q.
What is the arrow in a chemical equation...
H_{2 +}O₂ --> H₂O
answer choices
Reactants
Products
Yields
Chemical Equation
<p>Reactants</p>
alternatives
<p>Products </p>
<p>Yields </p>
<p>Chemical Equation </p>
answer explanation
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Question 22
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Q. What is the little number after an element in a chemical equation called.
Example: H₂
answer choices
Coefficient
Subscript
Atom
Equation
Coefficient<span style="color: #4990e2;"> </span>
alternatives
Subscript
Atom
Equation
answer explanation
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Question 23
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Q.
What do the elements oxygen, hydrogen, and chlorine have in common?
answer choices
all are metals
all exist as diatomic moolecules
all have positive charge numbers
all give electrons to satisfy the octet rule
<p>all are metals</p>
alternatives
<p>all exist as diatomic moolecules</p>
<p>all have positive charge numbers</p>
<p>all give electrons to satisfy the octet rule</p>
answer explanation
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Question 24
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What is meant by a "diatomic molecule?
answer choices
It is an atom that always has a coefficient of 2 in a balanced equation
it is an element that always has a plus 2 charge
it is a compound that has two elements only
it is when two atoms of the same element pair up to satisfy the octet rule
<p>It is an atom that always has a coefficient of 2 in a balanced equation</p>
alternatives
<p>it is an element that always has a plus 2 charge</p>
<p>it is a compound that has two elements only</p>
<p>it is when two atoms of the same element pair up to satisfy the octet rule</p>
answer explanation
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Question 25
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Q.
In a decomposition reaction...
answer choices
a more complex substance, like a compound, is broken into smaller parts
two or more polyatomic ions are combined to compose a more complex molecule
ionic bonds are broken and reformed as covalent bonds
two single atoms are combined to make a compound
<p>a more complex substance, like a compound, is broken into smaller parts</p>
alternatives
<p>two or more polyatomic ions are combined to compose a more complex molecule</p>
<p>ionic bonds are broken and reformed as covalent bonds</p>
<p>two single atoms are combined to make a compound</p>
answer explanation
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Question 26
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Q.
The law of conservation of mass states...
answer choices
the coefficients in a balanced equation must be the same on both sides of the arrow
that matter cannot be created nor destroyed
the charge must be conserved from the reactants to the products
subscripts in chemical formulas must all be equal
<p>the coefficients in a balanced equation must be the same on both sides of the arrow</p>
alternatives
<p>that matter cannot be created nor destroyed</p>
<p>the charge must be conserved from the reactants to the products</p>
<p>subscripts in chemical formulas must all be equal</p>
answer explanation
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Question 27
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Q. How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl₂ + H₂
answer choices
1
2
3
4
1
alternatives
2
3
4
answer explanation
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Question 28
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Q.
How many oxygens are in the following?
3Pb(OH)₄
answer choices
1
3
4
12
<p>1</p>
alternatives
<p>3</p>
<p>4</p>
<p>12</p>
answer explanation
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Question 29
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Q.
What are the numbers that you CANNOT change in a chemical equation?
answer choices
Coefficients
Products
Reactants
Subscripts
<p>Coefficients</p>
alternatives
<p>Products</p>
<p>Reactants</p>
<p>Subscripts</p>
answer explanation
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Question 30
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Q. Balance this equation
_Zn+_HCl-->_ZnCl₂+_H₂
answer choices
1,1,2,1
1,1,1,2
1,2,1,1
2,1,1,1
1,1,2,1
alternatives
1,1,1,2
1,2,1,1
2,1,1,1
answer explanation
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Question 31
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Q. Which problem is balanced?
answer choices
PbO₂ + 2H₂
SO₂ + H₂0 --> H₂SO₄
2Na + 2H₂O --> 2NaOH + H₂
PbO<sub>2</sub> + 2H<sub>2</sub>
alternatives
SO<sub>2</sub> + H<sub>2</sub>0 --> H<sub>2</sub>SO<sub>4</sub>
2Na + 2H<sub>2</sub>O --> 2NaOH + H<sub>2</sub>
answer explanation
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Question 32
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Q.
What type of chemical reaction is this?
2Fe + 3O₂ --> 2Fe₂O₃
answer choices
synthesis
decomposition
single replacement
double replacement
<p>synthesis</p>
alternatives
<p>decomposition</p>
<p>single replacement</p>
<p>double replacement</p>
answer explanation
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Question 33
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Q.
What is meant by a chemical change?
answer choices
it is when atoms are chemically altered by losing/gaining electrons
the ability of a substance to combine with or change into a different substance
a process in chemical equations where protons are changed into neutrons
<p>it is when atoms are chemically altered by losing/gaining electrons</p>
alternatives
<p>the ability of a substance to combine with or change into a different substance</p>
<p>a process in chemical equations where protons are changed into neutrons</p>
answer explanation
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Question 34
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Q.
Which of the following is NOT an indication that a chemical change has taken place?
answer choices
light is produced
there is a change in color
a change from a solid to a liquid
<p>light is produced</p>
alternatives
<p>there is a change in color</p>
<p>a change from a solid to a liquid</p>
answer explanation
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Question 35
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Q.
In order for a chemical reaction to occur atoms or molecules must collide with enough energy so that...
answer choices
bonds are broken
light is absorbed
energy is formed
protons change into neutrons
<p>bonds are broken</p>
alternatives
<p>light is absorbed</p>
<p>energy is formed</p>
<p>protons change into neutrons</p>
answer explanation
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Question 36
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Q.
The arrow in a balanced equations means...
answer choices
yields
adding
heat
energy
<p>yields</p>
alternatives
<p>adding</p>
<p>heat</p>
<p>energy</p>
answer explanation
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Question 37
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Q.
What is the expression for this balanced equation in words? Al₂(SO₄)₃ + BaCl_{2 ---->} AlCl₃ + BaSO₄
answer choices
aluminum sulfide an barium chlorine yield aluminum chlorate and barium sulfate
aluminum sulfate and barium chloride yields aluminum chloride and barium sulfate
aluminum sulfide and barium chlorate yields aluminum III chloride and barium II sulfide
aluminum sulfite and barium chloride yields aluminum chlorate and barium sulfite
<p>aluminum sulfide an barium chlorine yield aluminum chlorate and barium sulfate</p>
alternatives
<p>aluminum sulfate and barium chloride yields aluminum chloride and barium sulfate</p>
<p>aluminum sulfide and barium chlorate yields aluminum III chloride and barium II sulfide</p>
<p>aluminum sulfite and barium chloride yields aluminum chlorate and barium sulfite</p>
answer explanation
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Question 38
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Q.
AB ----> A + B is the general form of a __ reaction
answer choices
decomposition
synthesis
double replacement
single replacement
<p>decomposition</p>
alternatives
<p>synthesis</p>
<p>double replacement</p>
<p>single replacement</p>
answer explanation
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Question 39
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Q.
AX + BY -------> AY + BX is the general form for a ___ reaction.
answer choices
decomposition
synthesis
single replacement
double replacement
<p>decomposition</p>
alternatives
<p>synthesis</p>
<p>single replacement</p>
<p>double replacement</p>
answer explanation
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Question 40
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Q. Balance the equation:
Si(OH)₄+NaBr--> SiBr₄+NaOH
answer choices
Si(OH)₄+2NaBr--> SiBr₄+NaOH
Si(OH)₄+4NaBr--> SiBr₄+4NaOH
Si(OH)₄+NaBr--> SiBr₄+4NaOH
Si(OH)₄+2NaBr--> SiBr₄+2NaOH
Si(OH)<sub>4</sub>+2NaBr--> SiBr<sub>4</sub>+NaOH
alternatives
Si(OH)<sub>4</sub>+4NaBr--> SiBr<sub>4</sub>+4NaOH
Si(OH)<sub>4</sub>+NaBr--> SiBr<sub>4</sub>+4NaOH
Si(OH)<sub>4</sub>+2NaBr--> SiBr<sub>4</sub>+2NaOH
answer explanation
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