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Understanding Chemical Equations

Authored by tadesse yadesse

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11th Grade

Understanding Chemical Equations
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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the law of conservation of mass in relation to balancing chemical equations?

The law of conservation of mass requires that the number of atoms for each element is equal on both sides of a balanced chemical equation.

The law of conservation of mass states that mass can be created or destroyed in a chemical reaction.

Balancing chemical equations is only necessary for reactions involving gases.

The law of conservation of mass applies only to solid substances in a chemical reaction.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Balance the following equation: H2 + O2 → H2O.

2 H2 + O2 → 2 H2O

H2 + 2 O2 → H2O2

2 H2 + O2 → H2

H2 + O2 → H2O

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Identify the type of reaction: 2Na + Cl2 → 2NaCl.

Combination reaction

Decomposition reaction

Single displacement reaction

Double displacement reaction

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the four main types of chemical reactions?

Synthesis, Decomposition, Single Replacement, Double Replacement

Neutralization

Photolysis

Combustion

Redox

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Balance the equation: C3H8 + O2 → CO2 + H2O.

C3H8 + 2 O2 → CO2 + H2O

C3H8 + 4 O2 → 3 CO2 + 5 H2O

C3H8 + 5 O2 → 3 CO2 + 4 H2O

C3H8 + 3 O2 → 2 CO2 + 3 H2O

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a synthesis reaction? Provide an example.

An example of a synthesis reaction is the formation of water: 2H2 + O2 → 2H2O.

A synthesis reaction occurs when two substances are mixed without any chemical change: NaCl + H2O.

A decomposition reaction is the breakdown of water: 2H2O → 2H2 + O2.

An example of a synthesis reaction is the combustion of methane: CH4 + 2O2 → CO2 + 2H2O.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Describe a decomposition reaction and give an example.

An example of a decomposition reaction is the electrolysis of water, which produces hydrogen and oxygen gases.

An example of a decomposition reaction is the combustion of methane, producing carbon dioxide and water.

A decomposition reaction occurs when a substance is heated to form a new compound.

A decomposition reaction combines two or more substances to form a single product.

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