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Tenth Grade (Grade 10) Reactions Questions

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Grade 10 Reactions
Grade 10 Reactions
In what type of reaction does one reactant form two or more products?
  1. single replacement
  2. decomposition
  3. synthesis
  4. double replacement
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 10 Reactions
What type of reaction always releases energy?
  1. endothermic
  2. exothermic
  3. decomposition
  4. oxidation-reduction
Grade 10 Reactions
To balance a chemical equation, you may adjust the
  1. coefficients.
  2. subscripts.
  3. formulas of the product.
  4. either of coefficients or subscripts.
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
Grade 10 Reactions
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
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 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
Grade 10 Reactions
Grade 10 Reactions
What is the rate at which reactants change into products over time?
  1. production rate
  2. reaction rate
  3. interest rate
  4. chemical rate
Grade 10 Reactions
Which of the following statements is/are true?
  1. The total mass of the substance remains same in a chemical change.
  2. A chemical change is permanent and irreversible.
  3. A physical change is temporary and reversible.
  4. All the these.
Grade 10 Reactions
Which is the balance equation for the following reaction?

[math]KCl + Al rarr AlCl_3 + K[/math]
  1. [math]KCl + Al rarr AlCl_3 + 3K[/math]
  2. [math]3KCl + Al rarr 3AlCl_3 + K[/math]
  3. [math]KCl + Al rarr 3AlCl_3 + 3K[/math]
  4. [math]3KCl + Al rarr AlCl_3 + 3K[/math]
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