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1. Balancing Chemical Equations MS Pretest

1. Balancing Chemical Equations MS Pretest

1. Balancing Chemical Equations MS Pretest

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Question 1 of 7

1. Question
1 point(s)

Which equation demonstrates the law of conservation of mass?

Mg + S → MgS2
Correct Incorrect Correct answer

C + O2 → C2O
Correct Incorrect Correct answer

H2SO4 + Zn → 4ZnSO + H2
Correct Incorrect Correct answer

2H2 + O2 → 2H2O
Correct Incorrect Correct answer
Question 2 of 7

2. Question
1 point(s)

A chemical reaction is shown.

SnO2 + H2 → Sn + H2O

What is true about this chemical reaction?

It is balanced because the mass of the reactants is equal to the mass of the products
Correct Incorrect Correct answer

It is unbalanced because the mass of the reactants is greater than the mass of the products.
Correct Incorrect Correct answer

It is unbalanced because the mass of the reactants is less than the mass of the products.
Correct Incorrect Correct answer

It is balanced because the number of reactants is equal to the number of products.
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Question 3 of 7

3. Question
1 point(s)

___Pb + S –> PbS + Pb

1
Correct Incorrect Correct answer

2
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3
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4
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Question 4 of 7

4. Question
1 point(s)

Look at the following equation.

__Au2O3 → __Au + __O2

In order to follow the law of conservation of mass, this equation must have which set of coefficients, in order from
left to right?

2, 4, 3
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1, 3, 1
Correct Incorrect Correct answer

2, 1, 3
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1, 1, 3
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Question 5 of 7

5. Question
1 point(s)

When balancing a chemical equation, which of the following can be changed?

the coefficients
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the subscripts
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the formulas
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the mass
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Question 6 of 7

6. Question
1 point(s)

Which of the following is a balanced equation?

Na2S + 2KCl → 2NaCl + K2S
Correct Incorrect Correct answer

LiCl + 2H2O → 2HCl + Li2O
Correct Incorrect Correct answer

2KBr + 2CaO → K2O + CaBr2
Correct Incorrect Correct answer

NaCl + H2O → NaO + 2HCl
Correct Incorrect Correct answer

Question 7 of 7

7. Question

1 point(s)

Match each part of the following chemical equation with its correct term:

Al + O₂ –> 4AlO₃

Sort elements

Coefficient
Subscript
Reactants
Product
Yield/Make/Produce

4	Correct Incorrect Correct answer

3	Correct Incorrect Correct answer

Al + O2

Correct Incorrect Correct answer

4AlO3

Correct Incorrect Correct answer

–>	Correct Incorrect Correct answer

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