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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 6 Reactions
Grade 6 Reactions
Chemical reactions are happening
  1. sometimes
  2. most of the time
  3. all the time
  4. when you're awake
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 11 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]2 O_2 + 3 H_2[/math] [math]rarr[/math] [math] 2 H_2O[/math]
  3. [math]2 K + Cl_2[/math] [math]rarr[/math] [math]2 KCl[/math]
Grade 6 Reactions
Molecules react by
  1. switching atoms with other molecules.
  2. joining together with other molecules.
  3. breaking apart.
  4. all of the above
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
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