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6. What is the purpose of a PRODUCT being IN EXCESS?

  • To make sure all the reactants are used up
  • To make the reaction work
  • To make sure an expensive reactant is used up
  • To make sure a cheap reactant is used up

7. Why does the CONSERVATION OF MASS LAW sometimes not work?

  • If there is a limited reactant in the reaction.
  • A gas escapes or joins the reaction, increasing or decreasing mass
  • Solid escapes or joins the reaction, increasing or decreasing mass
  • Some liquid escapes or joins the reaction, increasing or decreasing mass

8. What is the MOLE?

  • The volume of an element
  • The amont of atoms in an element
  • The amount of a substance
  • A name for Avogadro's constant

9. What are the units for VOLUME OF SOLVENT?

  • dm ^3
  • cm ^3
  • dm
  • dm ^2

10. What is the symbol for RELATIVE ATOMIC MASS?

  • Ar
  • Mr
  • aR
  • mR

11. Why are there LIMITING REACTANTS?

  • To make sure the reaction works efficiently
  • To balance equations
  • To use up an expensive reactant
  • To use up an expensive product

12. What is the symbol for RELATIVE FORMULA MASS?

  • Mr
  • aR
  • Ar
  • mR

13. What are the units for CONCENTRATION?

  • m ^2
  • g/dm ^3
  • dm/g ^3
  • g ^3

14. How do you calculate CONCENTRATION?

  • solute volume / mass
  • mass * volume
  • mass / volume
  • volume / mass

15. What is CONCENTRATION?

  • A measure of the weakness of a solution
  • A measure of the density of a solution
  • A measure of the acidity of a solution
  • The mass of a solution

16. What can you do with REACTING MASSES?

  • Balance equations
  • Calculate the mass
  • Make half life equations
  • Calculate the mole

17. What is RELATIVE FORMULA MASS?

  • All the relative masses of atoms in a half equation added together.
  • All realtive atomic masses of atoms in a molecular formula added together.
  • All the relative atomic masses of atoms in a half equation added together.
  • All the realtive masses of atoms in a molecular formular added together.

18. What is the formula linking CONCENTRATION, MASS OF SOLUTE + VOLUMES OF SOLVENT?

  • Concentration = mass of solute / volume of solvent
  • Mass of solute = concentration * volume of solvent
  • Mass of solute = concentration / volume of solbent
  • Concentration = mass of solute * volume of solvent

19. How do you calculate VOLUME OF SOLVENT?

  • concentration / mass
  • mass / concentration
  • volume * concentration
  • mass * concentration

20. What is the calculation linking MASS, MOLES + FORMULA MASS?

  • Mass = formula mass * no. of moles
  • No. of moles = mass / formula mass
  • Formula mass = mass * no. of moles
  • Mass = no. of moles / formula mass