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Eighth Grade (Grade 8) Reactions Questions

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Grade 8 Reactions
What is the correct solution if you balanced the equation properly?
  1. 2Fe2O3+3C→4Fe+3CO2
  2. Fe2O3+C→4Fe+3CO2
  3. 2FeO3+3C→Fe+CO2
  4. 4FeO3+C→3Fe+3CO2
Grade 8 Reactions
In chemical reactions, what does the principle of conservation of mass mean?
  1. Matter is not changed.
  2. The total of mass of the reactants is greater than the total mass of the products.
  3. Matter is not created or destroyed.
  4. The total mass of the reactants is less than the total mass of the products.
Grade 8 Reactions
What is the principle of conservation of mass?
  1. The total mass must change for a chemical reaction to occur.
  2. The total mass of the reactants must be greater than the total mass of the products.
  3. The total mass of the products must be greater than the total mass of the reactants.
  4. The total mass of the reactants must equal the total mass of the products.
Grade 8 Reactions
Metal + HNO3→ Metal                
  1. Chloride
  2. Sulfate
  3. Nitrate
  4. Bromine
Grade 8 Reactions
How can you tell that a chemical reaction has occurred?
  1. the production of a gas or precipitate
  2. change in color
  3. a change in temperature
  4. all of the above
Grade 8 Reactions
What is an exothermic reaction?
  1. a reaction where energy is absorbed
  2. a reaction where energy is released
  3. a reaction where energy is multiplied
  4. a reaction where energy is divided
Grade 8 Reactions
Which statement is true about an exothermic reaction?
  1. It releases energy.
  2. It absorbs energy.
  3. It requires no activation energy.
  4. The energy of the products is greater than the energy of the reactants.
Grade 8 Reactions
Which kind of reaction needs energy to continue?
  1. Endothermic Reaction
  2. Exothermic reaction
Grade 8 Reactions
Chemical reactions play a significant role in purifying silicon for use in
  1. microchips.
  2. photosynthesis.
  3. cellular respiration.
  4. catalysts.
Grade 8 Reactions

This question is a part of a group with common instructions. View group »

                   is the release of nuclear particles and energy from unstable atomic nuclei.
  1. Superposition
  2. Indexing
  3. Radioactive decay
  4. Radiometric dating
Grade 8 Reactions
The products in an equation are
  1. on the left side of the equation.
  2. on the right side of the equation.
  3. not a part of a chemical equation
  4. are what you put into a reaction
Grade 8 Reactions
Which of the following is not a way to increase the rate of a chemical reaction?
  1. increase temperature by adding heat
  2. increase the surface area of the reactants
  3. add a catalyst
  4. decrease the concentration of the reactants
Grade 8 Reactions
Some chemical changes produce odors.
  1. True
  2. False
Grade 8 Reactions
What would happen if the activation energy for a particular chemical reaction was not available?
  1. The reaction would occur faster.
  2. The reaction would occur slower.
  3. The reaction would not occur.
  4. The reaction would begin sooner.
Grade 8 Reactions
When a solid forms as two solutions are mixed together, what is the solid called?
  1. compound
  2. mixture
  3. precipitate
  4. characteristic
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