munchkinjofan
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A-Levels chemistry Quiz on Definitions, created by munchkinjofan on 26/05/2013.

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Definitions

Definitions

Question 1 of 8

1

Define standard enthalpy change of combustion

Select one of the following:

  • The enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions, all reactants and products being in their standard conditions

  • The enthalpy change that takes place when one mole of a compound in its standard state is formed from its constituent elements in their standard states under standard conditions

  • The enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states

Explanation

Question 2 of 8

1

Define the standard enthalpy change of formation

Select one of the following:

  • The enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions, all reactants and products being in their standard conditions

  • The enthalpy change that takes place when one mole of a compound in its standard state is formed from its constituent elements in their standard states under standard conditions

  • The enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states

Explanation

Question 3 of 8

1

Define the standard enthalpy change of reaction

Select one of the following:

  • The enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions, all reactants and products being in their standard conditions

  • The enthalpy change that takes place when one mole of a compound in its standard state is formed from its constituent elements in their standard states under standard conditions

  • The enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states

Explanation

Question 4 of 8

1

Define "addition reaction"

Select one of the following:

  • A reaction in which a reactant is added to an unsaturated molecule to make a saturated molecule

  • A reaction in which a more reactive element displaces a less reactive element from an aqueous solution of the latter's ions.

  • The removal of a molecule from a saturated molecule to make an unsaturated molecule

  • The formation of a solid from a solution during a chemical reaction. Precipitates are often formed when two aqueous solutions are mixed together

  • A reaction in which an atom or group of atoms is replaced with a different atom, or group of atoms

Explanation

Question 5 of 8

1

Define "displacement reaction"

Select one of the following:

  • A reaction in which a reactant is added to an unsaturated molecule to make a saturated molecule

  • A reaction in which a more reactive element displaces a less reactive element from an aqueous solution of the latter's ions.

  • The removal of a molecule from a saturated molecule to make an unsaturated molecule

  • The formation of a solid from a solution during a chemical reaction. Precipitates are often formed when two aqueous solutions are mixed together

  • A reaction in which an atom or group of atoms is replaced with a different atom, or group of atoms

Explanation

Question 6 of 8

1

Define "elimination reaction"

Select one of the following:

  • A reaction in which a reactant is added to an unsaturated molecule to make a saturated molecule

  • A reaction in which a more reactive element displaces a less reactive element from an aqueous solution of the latter's ions.

  • The removal of a molecule from a saturated molecule to make an unsaturated molecule

  • The formation of a solid from a solution during a chemical reaction. Precipitates are often formed when two aqueous solutions are mixed together

  • A reaction in which an atom or group of atoms is replaced with a different atom, or group of atoms

Explanation

Question 7 of 8

1

Define "precipitation reaction"

Select one of the following:

  • A reaction in which a reactant is added to an unsaturated molecule to make a saturated molecule

  • A reaction in which a more reactive element displaces a less reactive element from an aqueous solution of the latter's ions.

  • The removal of a molecule from a saturated molecule to make an unsaturated molecule

  • The formation of a solid from a solution during a chemical reaction. Precipitates are often formed when two aqueous solutions are mixed together

  • A reaction in which an atom or group of atoms is replaced with a different atom, or group of atoms

Explanation

Question 8 of 8

1

Define "substitution reaction"

Select one of the following:

  • A reaction in which a reactant is added to an unsaturated molecule to make a saturated molecule

  • A reaction in which a more reactive element displaces a less reactive element from an aqueous solution of the latter's ions.

  • The removal of a molecule from a saturated molecule to make an unsaturated molecule

  • The formation of a solid from a solution during a chemical reaction. Precipitates are often formed when two aqueous solutions are mixed together

  • A reaction in which an atom or group of atoms is replaced with a different atom, or group of atoms

Explanation

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