Definitions

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A-Levels chemistry Quiz on Definitions, created by munchkinjofan on 26/05/2013.
munchkinjofan
Quiz by munchkinjofan, updated more than 1 year ago
munchkinjofan
Created by munchkinjofan almost 11 years ago
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Resource summary

Question 1

Question
Define standard enthalpy change of combustion
Answer
  • 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

Question 2

Question
Define the standard enthalpy change of formation
Answer
  • 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

Question 3

Question
Define the standard enthalpy change of reaction
Answer
  • 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

Question 4

Question
Define "addition reaction"
Answer
  • 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

Question 5

Question
Define "displacement reaction"
Answer
  • 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

Question 6

Question
Define "elimination reaction"
Answer
  • 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

Question 7

Question
Define "precipitation reaction"
Answer
  • 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

Question 8

Question
Define "substitution reaction"
Answer
  • 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
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