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NECO SSCE Thermochemistry — practice questions

Explore 28 free Thermochemistry questions in NECO SSCE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Thermochemistry questions and exercises with answers

Showing questions 1–28 of 28.

How is energy defined?Read the answer and worked solution →What is potential energy?Read the answer and worked solution →What is kinetic energy?Read the answer and worked solution →What is thermal energy?Read the answer and worked solution →How many joules is one calorie defined to equal?Read the answer and worked solution →How does the nutritional Calorie written with a capital C relate to the ordinary calorie?Read the answer and worked solution →A large and a small cast iron pan are compared. Which quantity is the same for both?Read the answer and worked solution →A flask holding 8.0 x 10^2 g of water is heated from 21 degrees C to 85 degrees C. How much heat does the water absorb, using 4.184 J/g degree C?Read the answer and worked solution →A 348 g metal piece absorbs 6.64 kJ and warms from 22.4 degrees C to 43.6 degrees C. What is its specific heat?Read the answer and worked solution →What is calorimetry used to measure?Read the answer and worked solution →A serving holds 5 g protein, 31 g carbohydrate and 12 g fat. Using 4, 4 and 9 Calories per gram, what is its energy content?Read the answer and worked solution →What is the internal energy of a substance?Read the answer and worked solution →What makes a quantity a state function?Read the answer and worked solution →How is enthalpy defined?Read the answer and worked solution →Given that H2(g) + half O2(g) giving H2O(l) has an enthalpy change of -286 kJ, what is it for 2H2(g) + O2(g) giving 2H2O(l)?Read the answer and worked solution →Reacting 0.0500 mol of HCl with 0.0500 mol of NaOH produces 2.9 kJ of heat. What is the enthalpy change per mole of acid?Read the answer and worked solution →What is the standard enthalpy of combustion of a substance?Read the answer and worked solution →How much heat is produced by burning 4.00 mol of acetylene, whose enthalpy of combustion is -1301.1 kJ/mol?Read the answer and worked solution →Burning 1.00 L of isooctane (density 0.692 g/mL, 114 g/mol, -5460 kJ/mol) produces how much heat?Read the answer and worked solution →What is the standard enthalpy of formation of an element in its most stable form?Read the answer and worked solution →Given that 3O2(g) giving 2O3(g) has a standard enthalpy change of +286 kJ, what is the enthalpy of formation of ozone?Read the answer and worked solution →What does Hess's law state?Read the answer and worked solution →Carbon burns to CO with an enthalpy change of -111 kJ, and CO burns to CO2 with -283 kJ. What is the value for carbon burning directly to CO2?Read the answer and worked solution →Given Fe + Cl2 giving FeCl2 at -341.8 kJ, and FeCl2 + half Cl2 giving FeCl3 at -57.7 kJ, what is the formation enthalpy of FeCl3?Read the answer and worked solution →Given N2 + O2 giving 2NO at +180.5 kJ and NO + half O2 giving NO2 at -57.06 kJ, what is the value for N2 + 2O2 giving 2NO2?Read the answer and worked solution →In a Hess's law problem a given step is reversed and then halved. What happens to its enthalpy change?Read the answer and worked solution →Using formation values of -278 for C2H5OH(l), -286 for H2O(l) and -394 kJ/mol for CO2(g), what is the heat of combustion of 1 mol of ethanol?Read the answer and worked solution →Split heat given out from heat taken inRead the answer and worked solution →

Worked practice questions

How is energy defined?

  1. The capacity to supply heat or do work
  2. The total mass held by a moving object
  3. The force needed to move a fixed mass
  4. The rate at which a hot body cools down
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Correct answer: A. The capacity to supply heat or do work

1. Energy is the capacity to supply heat or to do work. 2. Work here means causing matter to move against an opposing force. 3. Inflating a bicycle tyre is work, since air is pushed against the air already inside. 4. Mass and force are separate quantities and neither defines energy. _Source: OpenStax Chemistry (CC BY 4.0), Ch 5 "Thermochemistry", section 5.1 Energy Basics_

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What is potential energy?

  1. Energy an object has because it is moving
  2. Energy from position, composition or condition
  3. Energy carried away as light from a flame
  4. Energy needed to raise a mass by one degree
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Correct answer: B. Energy from position, composition or condition

1. Potential energy comes from an object's relative position, composition or condition. 2. Water at the top of a dam has it because of its height. 3. A battery has it because of the chemicals stored inside. 4. Energy of motion is kinetic energy, which is the other main type. _Source: OpenStax Chemistry (CC BY 4.0), Ch 5 "Thermochemistry", section 5.1 Energy Basics_

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What is kinetic energy?

  1. The energy stored in a chemical bond
  2. The energy an object has from its height
  3. The energy an object has from its motion
  4. The energy released when a fuel is burned
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Correct answer: C. The energy an object has from its motion

1. Kinetic energy is possessed by an object because it is moving. 2. Falling water has kinetic energy, which turns generators in a hydroelectric plant. 3. Expanding gases in an engine cylinder carry kinetic energy that moves the pistons. 4. Energy due to height or to stored chemicals is potential energy instead. _Source: OpenStax Chemistry (CC BY 4.0), Ch 5 "Thermochemistry", section 5.1 Energy Basics_

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