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Balancing Equations

9th - 12th grade

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Question 1
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Q. At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
answer choices
the product is doubled
the product is half the mass of the reactants
the mass is the same
the mass changes depending on the reaction
the product is doubled
alternatives
the product is half the mass of the reactants
the mass is the same
the mass changes depending on the reaction
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Question 2
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Q. In chemical reactions, what does the principle of conservation of mass mean?
answer choices
Matter is not created or destroyed.
The total mass of the reactants is greater than the total mass of the products.
The total mass of the reactants is less than the total mass of the products.
Matter is not changed.
Matter is not created or destroyed.
alternatives
The total mass of the reactants is greater than the total mass of the products.
The total mass of the reactants is less than the total mass of the products.
<span>Matter is not changed.<br></span>
answer explanation
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Question 3
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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 4
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Q. The blue numbers in the image below represent ________
answer choices
I don't know, and don't want to try
coefficients
subscripts
none of the answers are correct
I don't know, and don't want to try
alternatives
coefficients
subscripts
none of the answers are correct
answer explanation
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Question 5
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Q. The substances at the beginning of a chemical equation are called the ____
answer choices
product
yield
chemical symbol
reactants
product
alternatives
yield
chemical symbol
reactants
answer explanation
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Question 6
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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 7
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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 8
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Q. When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
answer choices
charge
subscript
random number
coefficient
charge
alternatives
subscript
random number
coefficient
answer explanation
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Question 9
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Q. What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Al + __O₂--> __Al₂O₃
answer choices
4,1 --> 2
4,3 --> 4
3,4 --> 1
4,3 --> 2
4,1 --> 2
alternatives
4,3 --> 4
3,4 --> 1
4,3 --> 2
answer explanation
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Question 10
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Q. What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H₂SO₃ + __KOH--> __H₂O+ __K₂SO₃
answer choices
2,1 --> 2,1
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
2,1 --> 2,1
alternatives
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
answer explanation
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Question 11
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Q. What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H₂ + __S --> __H₂S
answer choices
1,1 --> 1
2,2 --> 2
1,2 --> 1
1,2 --> 2
1,1 --> 1
alternatives
2,2 --> 2
1,2 --> 1
1,2 --> 2
answer explanation
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Question 12
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Q. What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__AgNO₃ + __H₂S --> __Ag₂S+ __HNO₃
answer choices
2,1 --> 1,2
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
2,1 --> 1,2
alternatives
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
answer explanation
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Question 13
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Q. What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CH₄ + __O₂ --> __CO₂+ __H₂O
answer choices
2,1 --> 2,1
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
2,1 --> 2,1
alternatives
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
answer explanation
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