IC2 Finals Review 1

Combustion of Methane:

Which of the following is the correctly balanced chemical equation for the combustion of methane (CH₄)?

• CH₄ + O₂ → CO₂ + H₂O

• CH₄ + 2O₂ → CO₂ + 2H₂O

• 2CH₄ + 3O₂ → 2CO₂ + 4H₂O

• CH₄ + 3O₂ → CO₂ + 2H₂O

Formation of Ammonia:

What are the correct coefficients to balance the equation for the formation of ammonia (NH₃) from nitrogen gas (N₂) and hydrogen gas (H₂)?

• N₂ + H₂ → NH₃ (unbalanced)

• N₂ + 2H₂ → 2NH₃

• N₂ + 3H₂ → 2NH₃

• 2N₂ + 3H₂ → 2NH₃

Neutralization Reaction:

The unbalanced equation for the reaction of sulfuric acid (H₂SO₄) and sodium hydroxide (NaOH) is H₂SO₄ + NaOH → Na₂SO₄ + H₂O. What is the coefficient of sodium hydroxide (NaOH) in the balanced equation?

• 1

• 2

• 3

• 4

Reaction of Silver Nitrate and Sodium Chloride:

Which of the following represents the balanced chemical equation for the reaction between silver nitrate (AgNO₃) and sodium chloride (NaCl)?

• AgNO₃ + NaCl → AgCl + NaNO₃

• 2AgNO₃ + NaCl → AgCl₂ + NaNO₃

• AgNO₃ + 2NaCl → AgCl₂ + 2NaNO₃

• 2AgNO₃ + 2NaCl → 2AgCl + 2NaNO₃

Reaction of Iron(III) Oxide and Carbon Monoxide:

In the balanced chemical equation for the reaction of iron(III) oxide (Fe₂O₃) and carbon monoxide (CO), what is the coefficient of carbon monoxide (CO)?

• 1

• 2

• 3

• 4

Energy Absorption in Reactions:

A chemical reaction that takes in heat energy from its surroundings is best described as:

• an exothermic process

• an endothermic process

• a combustion reaction

• a synthesis reaction

Characteristics of Exothermic Reactions:

Which of the following is a key characteristic of a reaction that releases heat?

• The temperature of the immediate environment decreases.

• Heat energy is transferred to the surroundings.

• The change in enthalpy has a positive value.

• Energy input is necessary to initiate the reaction.

Interpreting Enthalpy Change:

Consider the reaction N2​(g)+O2​(g)→2NO(g) with ΔH = +180 kJ. This reaction is:

• exothermic

• endothermic

• neither exothermic nor endothermic

• both exothermic and endothermic

Burning of Wood:

The process of wood burning is a common example of what type of reaction?

• endothermic

• exothermic

• decomposition

• neutralization

What term describes a chemical process where a substance loses electrons?

• reduction

• oxidation

• combustion

• combustion