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Reactions Questions - All Grades

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Grade 8 Reactions
In a reversible change matter
  1. cannot be changed back.
  2. can be changed back.
  3. is always liquid.
  4. does not exist.
Grade 8 Reactions
Which of these describes a catalyst?
  1. It is a reactant.
  2. It speeds up a reaction.
  3. It appears in the chemical equation.
  4. It can be used in place of an inhibitor.
Grade 10 Reactions
Which of the following is true for all chemical reactions?
  1. The total mass of the reactants increases.
  2. The total mass of the products is greater than the total mass of the reactants
  3. The total mass of the reactants equals the total mass of the products.
  4. The total mass of the products is less than the total mass of the reactants.
Grade 8 Reactions
Oxides are formed when                       burn in oxygen.
  1. metals only
  2. non-metals only
  3. metals and non-metals
  4. some metals only
Grade 10 Reactions
What type of chemical reaction is P+O→PO?
  1. synthesis
  2. decomposition
  3. single replacement
  4. double replacement
Grade 10 Reactions
What type of reaction is 2Al+6HCl→3H2+2AlCl3?
  1. synthesis
  2. decomposition
  3. single replacement
  4. double replacement
Grade 10 Reactions
What type of reaction does the following equation represent?

FeS+2HCl→FeCl2+H2S
  1. synthesis reaction
  2. double-displacement reaction
  3. single-displacement reaction
  4. decomposition reaction
Grade 10 Reactions
CaCo3(s)+Heat -> CaO(s) + CO2 (gas), this reaction is a/an                                   .
  1. endothermic reaction
  2. exothermic reaction
  3. Neither of the above
  4. reaction in which catalyst is used
Grade 8 Reactions
To slow down a chemical reaction, what should you add?
  1. catalyst
  2. reactant
  3. inhibitor
  4. enzyme
Grade 8 Reactions
A reactant is
  1. the process by which particles leave a gas and become a liquid.
  2. the process by which particles leave a liquid and become a gas.
  3. a substance made by a chemical reaction.
  4. a substance used in a chemical reaction.
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