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Questions and Answers
How is a chemical reaction recognized?
How is a chemical reaction recognized?
- By observing change in state, color, or evolution of gas (correct)
- By measuring the pH level
- By analyzing crystal structure
- By observing change in weight
What is a chemical equation used to represent?
What is a chemical equation used to represent?
- Biological reactions
- Nuclear reactions
- Chemical reactions (correct)
- Physical changes
Why do we balance a chemical equation?
Why do we balance a chemical equation?
- To increase the rate of the reaction
- To make the equation look more complex
- To ensure the number of atoms of each element remains the same (correct)
- To change the nature of the reaction
What is used to represent a gaseous substance in a chemical equation?
What is used to represent a gaseous substance in a chemical equation?
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What type of reaction is represented by the formation of Ca(OH)2 from CaO and H2O?
What type of reaction is represented by the formation of Ca(OH)2 from CaO and H2O?
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What is used to represent a gaseous substance in a chemical equation?
What is used to represent a gaseous substance in a chemical equation?
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What is the purpose of balancing a chemical equation?
What is the purpose of balancing a chemical equation?
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What does the chemical equation 3 Fe(s) + 4H2O(g) $\rightarrow$ Fe2O3(s) + 4H2(g) represent?
What does the chemical equation 3 Fe(s) + 4H2O(g) $\rightarrow$ Fe2O3(s) + 4H2(g) represent?
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Which type of reaction is represented by the formation of Ca(OH)2 from CaO and H2O?
Which type of reaction is represented by the formation of Ca(OH)2 from CaO and H2O?
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How can a chemical reaction be recognized?
How can a chemical reaction be recognized?
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