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Eleventh Grade (Grade 11) Reactions Questions

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Grade 11 Reactions
Taking an antacid is an example of what type of reaction?
  1. Combustion
  2. Neutralization
  3. Energy
  4. Decomposition
Grade 11 Reactions
In a chemical reaction
  1. the mass of the reactants equals the mass of the products
  2. the mass of the products is greater than the mass of the reactants
  3. the number of atoms in the reactants and products must change
  4. energy as heat must be added to the reactants
Grade 11 Reactions
To balance a chemical equation, it may be necessary to change the
  1. coefficients
  2. subscripts
  3. formulas of the products
  4. number of the product
Grade 11 Reactions
According to the Law of Conservation of Mass, the total mass of the reacting substances is
  1. always more than the total mass of the products
  2. always less than the total mass of the products
  3. sometimes more and sometimes less than the total mass of the products
  4. always equal to the total mass of the products
Grade 11 Reactions
What is the Greek prefix for the number 4
  1. tetra-
  2. hepta-
  3. hexa-
  4. deca-
Grade 11 Reactions
A chemical equation is balanced when the
  1. coefficients of the reactants equal the coefficients of the products
  2. reactants equal products
  3. products and reactants are the same chemicals
  4. subscripts of the reactants equal the subscripts of the products
Grade 11 Reactions
Grade 11 Reactions
Grade 11 Reactions
Grade 11 Reactions
Which observation does NOT indicate that a chemical reaction has occurred?
  1. formation of a precipitate
  2. production of a gas (bubbles)
  3. heat and light
  4. change in total mass of substances
Grade 11 Reactions
Consider the following endothermic reaction:
[math]N_2(g) + O_2(g) rarr 2NO (g) [/math]
[math]DeltaH = +180 (kJ)/(mol[/math]

Which of the following statements correctly describes 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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