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Reactions Questions - All Grades

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Grade 8 Reactions
In a synthesis reaction, what happens to a compound?
  1. Breakdown of an element into two new elements.
  2. A compound gets decomposed.
  3. A compound burns gas.
  4. A new more complex compound is formed.
Grade 8 Reactions
When any atom emits one alpha particle, the
  1. atomic number is changed by 2 units, but the atomic mass remains unchanged.
  2. atomic mass is changed by 2 units, but the atomic number remains unchanged.
  3. atomic number is decreased by 2 units, and the atomic mass is decreased by 4 units.
  4. atomic mass is decreased by 2 units, and the atomic number is decreased by 4 units.
Grade 11 Reactions
One or more substances changing into one or more new substances is defined as a
  1. physical change.
  2. precipitate.
  3. solution.
  4. chemical reaction.
Grade 11 Reactions
In a chemical equation, NaCl (aq) would indicate that the compound sodium chloride is likely
  1. water.
  2. dissolved in water.
  3. an acid.
  4. insoluable.
Grade 8 Reactions
What is the chemical name of the compound SiO2?
  1. Monosilicon dioxide
  2. Silicon oxide
  3. Silicon oxygen
  4. Silicon dioxide
Grade 10 Reactions
What is the term used to describe the energy needed to get a reaction started?
  1. adhesion energy
  2. activation energy
  3. cohesion energy
  4. chemical energy
Grade 6 Reactions
Carbon dioxide is formed when which of the following two substances are mixed together?
  1. milk and vinegar
  2. baking soda and vinegar
  3. baking soda and water
  4. sugar and water
Grade 10 Reactions
The reaction in which oxidation and reduction takes place at the same time is called                   .
  1. redox reaction
  2. oxidation reaction
  3. reduction reaction
  4. none of the above
Grade 9 Reactions
Which cannot take place during a chemical reaction?
  1. Formation of new atoms
  2. Bonds breaking between atoms
  3. Formation of new molecules
  4. Bonds forming between atoms
Grade 8 Reactions
A product is
  1. a substance used in a chemical reaction.
  2. the process by which particles leave a gas and become a liquid.
  3. the process by which a solid changes directly into a gas.
  4. a substance made by a chemical reaction.
Grade 8 Reactions
Two types of radioactive decay are alpha decay and                .
  1. omega decay
  2. beta decay
  3. half-life decay
  4. absolute decay
Grade 10 Reactions
What is the chemical formula for disulfur decafluoride?
  1. S10F2
  2. S3F9
  3. S2F10
  4. S2F8
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