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Reactions Questions - All Grades

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Grade 7 Reactions
A chemical change
  1. always can be reversed
  2. never will change state
  3. never can be reversed
  4. cannot be reversed easily
Grade 10 Reactions
What type of reaction does the following equation represent?

[math]FeS + 2HCl rarr FeCl_2 + H_2S[/math]
  1. synthesis reaction
  2. double-displacement reaction
  3. single-displacement reaction
  4. decomposition reaction
Grade 5 Reactions
In a reversible change,
  1. matter can not be changed back
  2. matter can be changed back
  3. matter doesn't exist
  4. matter is always liquid
Grade 8 Reactions
When oxygen in the air reacts with iron, iron oxide forms. Which of the following statements is correct?
  1. This is a physical change.
  2. This is a chemical change.
  3. Iron and iron oxide have the same properties.
  4. Oxygen and iron have similar properties.
Grade 6 Reactions
The substances that go into a reaction are called the
  1. reactants
  2. chemicals
  3. questions
  4. products
Grade 5 Reactions
Grade 9 Reactions
Which of the following is a balanced equation?
  1. [math]3 N_2 + 3 H_2[/math] [math]rarr[/math] [math]2 NH_3[/math]
  2. [math] 4 Al + 6 HCl [/math] [math]rarr[/math] [math] 3 H_2 + 2 AlCl_3 [/math]
  3. [math]2 O_2 + 3 H_2[/math] [math]rarr[/math] [math] 2 H_2O[/math]
  4. [math]2 K + Cl_2[/math] [math]rarr[/math] [math]2 KCl[/math]
Grade 8 Reactions
Which of the following statements about chemical properties is true?
  1. They can be observed when the identity of a substance changes.
  2. They can always be observed without changing the identity of a substance.
  3. They are easier to observe than physical properties.
  4. They are the properties that are most useful in identifying a substance.
Grade 7 Reactions
A process by which an electric current breaks chemical bonds.
  1. electrolysis
  2. characteristic property
  3. chemical bond
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