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Eleventh Grade (Grade 11) Reactions Questions

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Grade 11 Reactions
You know that you have a balanced chemical equation when the                                                                                                          .
  1. coefficients of the reactants equal the coefficients of the products
  2. number of atoms of each element in the reactants equal that of each corresponding element in the products
  3. products and reactants are the same chemicals
  4. subscripts of the reactants equal the subscripts of the products
Grade 11 Reactions
Based on the Law of Conservation of Mass, we know that the mass of the reactants                                                                            .
  1. always be more than the total mass of the products
  2. always be less than the total mass of the products
  3. sometimes be more and sometimes be less than the total mass of the products
  4. always be equal to the total mass of the products
Grade 11 Reactions
In all chemical equations, the products' collective mass                                                              .
  1. is less than the reactants' total mass
  2. is greater than the reactants' total mass
  3. is equal to the reactants' total mass
  4. has no quantitative relationship to the reactants' total mass
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
All of the following are clear indicators that a chemical change has occurred EXCEPT for what?
  1. the formation of a precipitate
  2. the production of a gas (bubbles)
  3. heat and light
  4. a change in the total mass of substances
Grade 11 Reactions
Which of the following must always be true for any kind of chemical reaction?
  1. The masses of the products and the reactants are equal.
  2. The mass of the products is greater than that of the reactants.
  3. The number of atoms in the reactants must change when products are formed.
  4. The reactants require the absorption of heat for a reaction to occur.
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
Grade 11 Reactions
What is the Greek prefix for the number 4?
  1. tetra-
  2. hepta-
  3. hexa-
  4. deca-
Grade 11 Reactions
Balancing a chemical equation requires manipulation of the
  1. coefficients.
  2. subscripts.
  3. formulas of the products.
  4. number of the product.
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