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Reactions Questions - All Grades

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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 8 Reactions
Radioactivity is due to                                     .
  1. a stable electronic configuration
  2. an unstable electronic configuration
  3. a stable nucleus
  4. an unstable nucleus
Grade 8 Reactions
Which example shows a coefficient being used correctly to balance a chemical equation?
  1. [math]Na+Cl_2->2NaCl[/math]
  2. [math]Na+2Cl_2->2NaCl[/math]
  3. [math]2Na+Cl_2 ->2NaCl_2[/math]
  4. [math]2Na+Cl_2->2NaCl[/math]
Grade 10 Reactions
An endothermic reaction                                                   .
  1. absorbs heat from the environment
  2. releases heat from the environment
  3. is when two substances interact and create bubbles
  4. none of the above
Grade 6 Reactions
Which of the following refers to the ability of a substance to burn?
  1. reactivity
  2. flammability
  3. inertia
  4. malleability
Grade 8 Reactions
What information do you need to write a chemical equation?
  1. reactants
  2. products
  3. chemical formulas
  4. all of the above
Grade 8 Reactions
A change in matter that produces a new substance(s) is called                  .
  1. chemical reaction
  2. physical change
  3. mixture
  4. solution
Grade 10 Reactions
An exergonic (spontaneous) reaction is a chemical reaction that                                                         .
  1. is common in anabolic pathways
  2. cannot occur outside of a living cell
  3. occurs only when an enzyme or other catalyst is present
  4. releases energy when proceeding in the forward direction
Grade 10 Reactions
How are reactions related to chemical bonds?
  1. bonds in the reactants are broken and bonds in the products are formed
  2. bonds in the products are broken and bonds in the reactants are formed
  3. bonds are formed in both the reactants and products
  4. none of the above
Grade 9 Reactions
A reaction that forms water and a salt is called a                        .
  1. chemical reaction
  2. basic reaction
  3. neutralization reaction
  4. none of the above
Grade 10 Reactions
What is a reaction in which two or more substances react to form a single substance?
  1. single reaction
  2. synthesis reaction
  3. combustion
  4. none of the above
Grade 10 Reactions
Generally, an increase in temperature                              .
  1. increases reaction rate
  2. decreases reaction rate
  3. acts as a catalyst
  4. does not affect reaction rate
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