Adaptive Practice
Chemical Reactions
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Question 1 of 10
⏱ 0:30
Easy
Which of the following is a chemical change?
Easy
In the reaction: Zn + 2HCl → ZnCl₂ + H₂, which gas is evolved?
Easy
What type of reaction is represented by the equation: 2H₂ + O₂ → 2H₂O?
Medium
Which of the following is an example of a displacement reaction?
Medium
In the reaction: 2KClO₃ → 2KCl + 3O₂, what is the role of heat?
Medium
Which of the following statements is true about exothermic reactions?
Hard
What is the correct balanced equation for the reaction of methane (CH₄) with oxygen (O₂) to form carbon dioxide and water?
Medium
Which gas is released when an acid reacts with a metal carbonate?
Hard
Identify the oxidizing agent in the reaction: 2Fe + 3Cl₂ → 2FeCl₃
Easy
Which of the following is NOT a characteristic of a chemical reaction?