Practice Balancing Chemical Equations (1.3) - Chemical Reactions - IB 10 Sciences (Group 4)

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9 questions

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6 questions · about 4 min · pass mark 70%. Hints available.
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3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the first step in balancing a chemical equation?
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Think about what must be established before checking the conservation of mass.
Question 2.
In the reaction H2 + O2 = H2O, how many hydrogen atoms do we have on the left side?
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Count the atoms carefully from the reactants.
3Question 3.
Why is balancing chemical equations necessary?
- A. To create new substances
- B. To follow the law of conservation of mass
- C. Both A and B
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Refer back to the principle of mass you learned.
4Question 4.
True or False: Only the products in a chemical equation need to be balanced.
- True
- False
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Consider how many reactants exist compared to products.
Question 5.
Balance the following equation: Al + HCl = AlCl3 + H2.
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Start by balancing aluminum first, followed by chlorine.
Question 6.
Balance the equation for the complete combustion of propane: C3H8 + O2 = CO2 + H2O.
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Focus on balancing carbon, then hydrogen, leaving oxygen last.

5 more questions in this section. Enroll free to practise them all.