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Reactions Questions - All Grades

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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 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 10 Reactions
What type of chemical reaction is [math]P + O -> PO[/math]?
  1. synthesis
  2. decomposition
  3. single replacement
  4. double replacement
Grade 9 Reactions
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 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 is the product in the chemical formula [math]N+O_2=NO_2[/math]?
  1. [math]NO_2[/math]
  2. [math]O[/math]
  3. [math]O_2[/math]
  4. [math]N[/math]
Grade 8 Reactions
What law says that nothing can be created or destroyed in a reaction?
  1. The Law of Physics
  2. The Law of Conservation and Mass
  3. The Law of Chemistry
  4. The Law of Conserving Chemical Reactions
Grade 11 Reactions
Grade 6 Reactions
It is the ability of a substance to burn. What is it?
  1. reactivity
  2. flammability
  3. inertia
  4. malleability
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