Which of the following is true for an endothermic reaction?

Heat energy is taken from the surroundings

Heat energy is released to the surroundings

The temperature of the surroundings increases

The enthalpy change (ΔH) is negative

Which of the following statements is true for an exothermic reaction?

The chemicals lose energy, and ΔH is negative.

The chemicals gain energy, and ΔH is positive.

The temperature of the surroundings decreases.

The temperature of the chemical system increases.

In an endothermic reaction, what happens to the temperature of the surroundings?

The temperature of the surroundings decreases.

The temperature of the surroundings increases.

The temperature of the surroundings remains constant.

The temperature of the chemical system decreases.

Which of the following best describes the energy change in an exothermic reaction?

Energy is released to the surroundings.

Energy is absorbed by the chemical system.

Energy remains constant in the chemical system.

Energy is transferred from the surroundings to the chemical system.

What is required for complete combustion to occur?

Sufficient oxygen to completely oxidize all carbon atoms

What are the products of complete combustion?

Carbon dioxide and carbon monoxide

What does a thermochemical equation represent?

C) The enthalpy change of a chemical reaction

A) The change in temperature of a chemical reaction

B) The change in pressure of a chemical reaction

D) The volume change of a chemical reaction

Which of the following must be included in a thermochemical equation?

B) The physical states of the reactants and products

C) The density of the reactants

D) The boiling points of the reactants

What happens to the ΔH value if the coefficients in a thermochemical equation are doubled?

The ΔH value remains the same.

What happens to the ΔH value if a reaction is reversed?

The ΔH value is equal but opposite in sign.

The ΔH value remains the same.

How does increased unsaturation in hydrocarbon chains affect combustion?

It makes combustion less complete

It makes combustion more complete

It increases the volatility of the hydrocarbon

What does decreased volatility in longer hydrocarbon chains result in?

Reduced ability to mix with gases

Increased ability to mix with gases

Increased combustion efficiency

What is one of the characteristics of carbon monoxide (CO) in the environment?

It persists in the environment for long periods of time.

It is easily detectable by smell.

How does carbon monoxide (CO) affect haemoglobin in the blood?

It strongly bonds to haemoglobin, preventing it from transporting oxygen to cells.

It enhances the oxygen-carrying capacity of haemoglobin.

It has no effect on haemoglobin.

It weakly bonds to haemoglobin, allowing normal oxygen transport.

How does soot contribute to global warming?

By absorbing and reradiating solar radiation

What does the molar enthalpy of combustion represent?

The quantity of heat released per mole of fuel

The quantity of heat absorbed per mole of fuel

The quantity of fuel consumed per mole of heat

The quantity of energy stored in the fuel

How can a temperature change be measured and recorded in the context of combustion?

By measuring the heat released from the combustion of a measured mass of fuel to a known volume of water

By measuring the heat absorbed by the fuel

By measuring the change in volume of the fuel

By measuring the change in pressure of the fuel

What does the symbol 'n' stand for in the context of enthalpy of combustion?

Number of moles of fuel that underwent complete combustion

Mass of water (or liquid) heated

Temperature change of the solvent

Which of the following is measured in grams (g)?

Mass of water (or liquid) heated

Specific heat capacity of solvent

Temperature change of the solvent

What is the first step in using a simple calorimeter?

Placing a known mass of water in a vessel

Recording the final temperature

What is done after the spirit burner is placed underneath the vessel?

The initial temperature is recorded

The final temperature is recorded

What is the purpose of reweighing the spirit burner after the flame is extinguished?

To determine the change in mass of fuel

To determine the initial temperature

To determine the final temperature

To determine the specific heat capacity

What can be calculated using the data from the simple calorimeter and specific heat capacity?

The heat energy released and molar enthalpy of combustion

Lecture 4.1b

Passage

•

Chemistry

•

12th Grade

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Practice Problem

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Easy

Steve McKerlie

Used 2+ times

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62 questions

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Thermometry

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