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Questions and Answers
Which observation can help determine a chemical reaction?
Which observation can help determine a chemical reaction?
- Change in pressure
- Change in volume
- Change in density
- Evolution of a gas (correct)
In a physical change, what typically occurs?
In a physical change, what typically occurs?
- Formation of new substances
- Evolution of gas
- Change in temperature
- Change in state but no new substance is formed (correct)
What is an example of a chemical change?
What is an example of a chemical change?
- Melting ice
- Boiling water
- Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s) (correct)
- Mixing sugar in water
Which factor is NOT indicative of a chemical reaction?
Which factor is NOT indicative of a chemical reaction?
What is the main difference between chemical and physical changes?
What is the main difference between chemical and physical changes?
Which type of change involves bonds being made or broken between atoms?
Which type of change involves bonds being made or broken between atoms?
What does a word equation help identify in a chemical reaction?
What does a word equation help identify in a chemical reaction?
What does the symbol '(l)' represent in a chemical equation?
What does the symbol '(l)' represent in a chemical equation?
Which law states that no atoms can be created or destroyed in a chemical reaction?
Which law states that no atoms can be created or destroyed in a chemical reaction?
What is the purpose of balancing a chemical equation?
What is the purpose of balancing a chemical equation?
What is the shortcut technique for balancing a chemical equation mentioned in the text?
What is the shortcut technique for balancing a chemical equation mentioned in the text?
In the chemical equation: aCaCO3 + bH3PO4 → cCa3(PO4)2 + dH2CO3, what are the values of a, b, c, and d when c=1?
In the chemical equation: aCaCO3 + bH3PO4 → cCa3(PO4)2 + dH2CO3, what are the values of a, b, c, and d when c=1?
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