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Exam 4: Chemical Reactions and Equations

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Question 1

Multiple Choice

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Which of the following is a common product of combustion reactions?

A) H₂
B) CO₂
C) O₂
D) N₃
E) CH₄

F) B) and C)
G) A) and E)

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Question 2

Multiple Choice

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Which of the following chemical equations represents a decomposition reaction?

A) C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
B) 2HBr + Cl₂ → 2HCl + Br₂
C) Na₂CO₃ →Na₂O + CO₂
D) H₂ + Cl₂ → 2HCl
E) Na₂O + CO₂ → Na₂CO₃

F) B) and C)
G) All of the above

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Question 3

Multiple Choice

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When an oxidation number of an atom is decreased in the course of a reaction, that atom is being _____.

The reaction of an acid and a base is called a _____ reaction.

_____ are general statements that predict which ionic compounds dissolve and which do not.

A chemical reaction in which a single substance is produced from multiple reactants is called a(n) _____.

Write a short note on predicting the chemical reactivity trends in single-replacement reactions.

_____ is a chemical reaction in which one element is substituted for another element in a compound.

The process of losing one or more electrons by an atom is called _____.

H₃O⁺ is called trihydroxo ion.

Oxidation and reduction always occur together in reality.

Lead (II) carbonate (PbCO₃) cannot be dissolved in water.

Which of the following represents a hydronium ion?

Explain the following: (1) complete ionic equation, (2) spectator ions, (3) net ionic equation.

The chemical equation CH₄ + O₂ $\rightarrow$ CO₂ + H₂O cannot be balanced to form a proper equation.

The oxidation number of oxygen molecule (O₂) is -2.

Which of the following terms refer to an ionic compound that is formed from a reaction between an acid and a base?

What is a chemical equation? Explain with an example.

A double-replacement reaction occurs when parts of two ionic compounds are exchanged to make two new compounds.

Which of the following carbonates can be dissolved in water?