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Eighth Grade (Grade 8) Reactions Questions

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Grade 8 Reactions
Oxides are formed when                       burn in oxygen.
  1. metals only
  2. non-metals only
  3. metals and non-metals
  4. some metals only
Grade 8 Reactions
To slow down a chemical reaction, what should you add?
  1. catalyst
  2. reactant
  3. inhibitor
  4. enzyme
Grade 8 Reactions
A reactant is
  1. the process by which particles leave a gas and become a liquid.
  2. the process by which particles leave a liquid and become a gas.
  3. a substance made by a chemical reaction.
  4. a substance used in a chemical reaction.
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 8 Reactions
What is the chemical name of the compound SiO2?
  1. Monosilicon dioxide
  2. Silicon oxide
  3. Silicon oxygen
  4. Silicon dioxide
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 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 8 Reactions
Who coined and defined the term radioactivity?
  1. Curie
  2. Einstein
  3. Dalton
  4. Rutherford
Grade 8 Reactions
Copper sulfate is made using which reaction?
  1. Cu+H2SO4→
  2. Cu+HCl→
  3. Cu+HNO3→
Grade 8 Reactions
Which of the following would decrease the rate of a chemical reaction?
  1. increase the temperature
  2. reduce the concentration of a reactant
  3. increase the concentration of a reactant
  4. add a catalyst
Grade 8 Reactions
Which is NOT evidence that a chemical reaction has occurred?
  1. Milk tastes sour.
  2. Steam condenses on a cold window.
  3. A strong odor comes from a broken egg.
  4. A slice of raw potato darkens.
Grade 8 Reactions
What does NOT affect reaction rate?
  1. balancing
  2. temperature
  3. surface area
  4. concentration
Grade 8 Reactions
A baker is baking biscuits using flour, butter, baking powder, salt, and milk. Which of these best explains why the properties of the biscuits are different from the properties of the ingredients?
  1. The ingredients go through a chemical change when they are baked.
  2. The ingredients are mixed together, so the biscuits have a mix of their properties.
  3. The ingredients get dried out during baking, so the properties of the milk are gone.
  4. The ingredients are made of mostly flour, so the biscuits just have the properties of flour.
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