Adaptive Practice
Chemical Reactions
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Easy
Which of the following is a chemical change?
Easy
In the reaction: 2Mg + O₂ → 2MgO, magnesium is acting as a:
Easy
Which gas is released when an acid reacts with a metal?
Medium
What type of reaction is represented by: Zn + 2HCl → ZnCl₂ + H₂?
Medium
In the reaction 2H₂O₂ → 2H₂O + O₂, which type of reaction is this?
Easy
Which of the following is NOT a characteristic of a chemical reaction?
Hard
In the reaction: CuSO₄ + Zn → ZnSO₄ + Cu, what happens to zinc?
Medium
Which of the following reactions is an example of a double displacement reaction?
Medium
What is the role of a catalyst in a chemical reaction?
Easy
Which of the following is an example of an exothermic reaction?