Review the image and then pick the scenario below which best illustrates the Law of Conservation of Mass.

A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 10g of Substance C.

A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 15g of Substance C.

Observe the reaction shown here. The formula for this equation is $$N_2\ +\ H_2\ \rightarrow\ NH_3$$ . Does this represent a balanced equation that obeys the Law of Conservation of Mass?

No. The reactants and products are not equal in numbers of atoms of each element.

Yes. The reactants and products are equal in numbers of atoms of each element.

A subscript tells you...

the # atoms of the element it sits behind

the # of atoms in the entire equation

the # of elements in the equation

A coefficient tells you...

the # of molecules of that substance

the # of atoms in the entire equation

the # of elements in the equation

the # atoms of the element it sits behind

The Law of Conservation of Mass proves that -

the number of atoms in a chemical reaction does not change

there are more atoms on the reactant side than the product side

there are more atoms on the product side than the reactant side

Types of Chemical Reactions

Authored by Leah Drennan

Chemistry

9th - 12th Grade

NGSS covered

Used 8+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of equation does the following represent?

2 NaBr + 1 Ca(OH)₂ ----> 1 CaBr₂ + 2 NaOH

Synthesis (or combination)

Decomposition

Single replacement

Double replacement

Combustion

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of equation does the following represent?

2 NH₃+ 1 H₂SO₄ ----> 1 (NH₄)₂SO₄

Synthesis (or combination)

Decomposition

Single replacement

Double replacement

Combustion

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of equation does the following represent?

3 Pb + 2 H₃PO₄ ----> 3 H₂ + 1 Pb₃(PO₄)₂

Synthesis (or combination)

Decomposition

Single replacement

Double replacement

Combustion

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of equation does the following represent?

1 Li₃N + 3 NH₄NO₃ ----> 3 LiNO₃ + 1 (NH₄)₃N

Synthesis (or combination)

Decomposition

Single replacement

Double replacement

Combustion

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of equation does the following represent?

3 HBr + 1 Al(OH)₃ ----> 3 H₂O + 1 AlBr₃

Synthesis (or combination)

Decomposition

Single replacement

Double replacement

Combustion

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of equation does the following represent?

Na₃PO₄ + 3 KOH ----> 3 NaOH + K₃PO₄

Synthesis (or combination)

Decomposition

Single replacement

Double replacement

Combustion

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of equation does the following represent?

Pb + FeSO₄ ----> PbSO₄ + Fe

Synthesis (or combination)

Decomposition

Single replacement

Double replacement

Combustion

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Types of Chemical Reactions

What type of equation does the following represent?

2 NaBr + 1 Ca(OH)₂ ----> 1 CaBr₂ + 2 NaOH

What type of equation does the following represent?

2 NH₃+ 1 H₂SO₄ ----> 1 (NH₄)₂SO₄

What type of equation does the following represent?

3 Pb + 2 H₃PO₄ ----> 3 H₂ + 1 Pb₃(PO₄)₂

What type of equation does the following represent?

1 Li₃N + 3 NH₄NO₃ ----> 3 LiNO₃ + 1 (NH₄)₃N

What type of equation does the following represent?

3 HBr + 1 Al(OH)₃ ----> 3 H₂O + 1 AlBr₃

What type of equation does the following represent?

Na₃PO₄ + 3 KOH ----> 3 NaOH + K₃PO₄

What type of equation does the following represent?

Pb + FeSO₄ ----> PbSO₄ + Fe

What type of equation does the following represent?

CaCO₃ ----> CaO + CO₂

What type of equation does the following represent?

P₄ + 3 O₂ ----> 2 P₂O₃

What type of equation does the following represent?

CxHy +O₂--> H₂O + CO₂

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Types of Chemical Reactions

What type of equation does the following represent?2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

What type of equation does the following represent?2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4

What type of equation does the following represent?3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2

What type of equation does the following represent?1 Li3N + 3 NH4NO3 ----> 3 LiNO3 + 1 (NH4)3N

What type of equation does the following represent?3 HBr + 1 Al(OH)3 ----> 3 H­2O + 1 AlBr3

What type of equation does the following represent?Na3PO4 + 3 KOH ----> 3 NaOH + K3PO4

What type of equation does the following represent?Pb + FeSO4 ----> PbSO4 + Fe

What type of equation does the following represent?CaCO3 ----> CaO + CO2

What type of equation does the following represent?P4 + 3 O2 ----> 2 P2O3

What type of equation does the following represent?CxHy +O2 --> H2O + CO2

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What type of equation does the following represent?

2 NaBr + 1 Ca(OH)₂ ----> 1 CaBr₂ + 2 NaOH

What type of equation does the following represent?

2 NH₃+ 1 H₂SO₄ ----> 1 (NH₄)₂SO₄

What type of equation does the following represent?

3 Pb + 2 H₃PO₄ ----> 3 H₂ + 1 Pb₃(PO₄)₂

What type of equation does the following represent?

1 Li₃N + 3 NH₄NO₃ ----> 3 LiNO₃ + 1 (NH₄)₃N

What type of equation does the following represent?

3 HBr + 1 Al(OH)₃ ----> 3 H₂O + 1 AlBr₃

What type of equation does the following represent?

Na₃PO₄ + 3 KOH ----> 3 NaOH + K₃PO₄

What type of equation does the following represent?

Pb + FeSO₄ ----> PbSO₄ + Fe

What type of equation does the following represent?

CaCO₃ ----> CaO + CO₂

What type of equation does the following represent?

P₄ + 3 O₂ ----> 2 P₂O₃

What type of equation does the following represent?

CxHy +O₂--> H₂O + CO₂