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Reactions Questions - All Grades

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Grade 8 Reactions
Which of the following is an indicator of a chemical change or reaction?
  1. a solid dissolves
  2. a new substance is formed
  3. water turns to steam
  4. a mixture is made
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 7 Reactions
A chemical change                          .
  1. always can be reversed
  2. never will change state
  3. never can be reversed
  4. cannot be reversed easily
Grade 10 Reactions
To balance a chemical equation, you may adjust the
  1. coefficients.
  2. subscripts.
  3. formulas of the product.
  4. either of coefficients or subscripts.
Grade 10 Reactions
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 11 Reactions
You know that you have a balanced chemical equation when the
  1. coefficients of the reactants equal the coefficients of the products.
  2. number of atoms of each element in the reactants equal that of each corresponding element in the products.
  3. products and reactants are the same chemicals.
  4. subscripts of the reactants equal the subscripts of the products.
Grade 8 Reactions
Grade 8 Reactions
Which example shows a coefficient being used correctly to balance a chemical equation?
  1. [math]Na+Cl_2->2NaCl[/math]
  2. [math]Na+2Cl_2->2NaCl[/math]
  3. [math]2Na+Cl_2 ->2NaCl_2[/math]
  4. [math]2Na+Cl_2->2NaCl[/math]
Grade 8 Reactions
What information do you need to write a chemical equation?
  1. reactants
  2. products
  3. chemical formulas
  4. all of the above
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