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Eleventh Grade (Grade 11) Reactions Questions

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Grade 11 Reactions
A solid that forms when two liquids react is called a
  1. reactant.
  2. product.
  3. precipitate.
  4. liquid.
Grade 11 Reactions
Which chemical equation shows precipitation?
  1. NaCl+AgNO3→AgCl↓+NaNO3
  2. NaOH+HCl→NaCl+H2O
  3. Fe2++Ce4+⇔Fe3++Ce3+
  4. CH3COOH+NaOH→CH3COONa+H2O
Grade 11 Reactions
Which of the following reactions is considered endothermic?
  1. acid neutralising alkali causing a temperature increase
  2. adding magnesium to hydrochloric acid
  3. calcium carbonate decomposing when heated
  4. combustion of fossil fuels
Grade 11 Reactions
Enzymes are                       .
  1. homogenous catalysts
  2. heterogenous catalysts
  3. acid catalysts
  4. base catalysts
Grade 11 Reactions
The diagram shows a match.
  1. A
  2. B
  3. C
  4. D
Grade 11 Reactions
When ammonium nitrate is added to water the temperature of the water decreases. The ammonium nitrate can be recovered by evaporating the water added. What explains these observations?
  1. The ammonium nitrate dissolves in the water and the process is endothermic.
  2. The ammonium nitrate reacts with the water and the process is endothermic.
  3. The ammonium nitrate dissolves in the water and the process is exothermic.
  4. The ammonium nitrate reacts with the water and the process is exothermic.
Grade 11 Reactions
Ingesting an antacid from the pharmacy demonstrates an example of which of the following?
  1. Combustion
  2. Neutralization
  3. Energy
  4. Decomposition
Grade 11 Reactions
Which of the following is false regarding excess and limiting reagents?
  1. The quantity of yielded product is limited based on the quantity of limiting reagent
  2. A minuscule quantity of the excess reagent remains after the limiting reagent is completely consumed
  3. The reactant with the lowest initial mass is the limiting reagent
  4. A balanced chemical equation is used to determine the limiting reagent in the chemical equation
  5. None of the above
Grade 11 Reactions
Consider the following endothermic reaction:
N2(g)+O2(g)→2NO(g)
ΔH=+180kJmol

Which statement correctly defines this endothermic reaction?
  1. Product is less stable than the reactants
  2. Heat is evolved in this reaction
  3. Reaction proceeds spontaneously in the forward direction
  4. Enthalpy of products is less than those of reactants
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