Conservation of Mass Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. What does the state symbol (aq) mean?
- A. Solid
- B. Liquid
- C. Gas
- D. Dissolved in water
2. According to the law of conservation of mass, what happens to atoms during a chemical reaction?
- A. Atoms are created
- B. Atoms are destroyed
- C. No atoms are lost or made, only rearranged
- D. Atoms change into different elements
3. In a balanced symbol equation, why must the number of each type of atom be equal on both sides?
- A. To make the equation look neat
- B. Because mass is conserved - atoms cannot be created or destroyed
- C. Because reactants are always heavier than products
- D. Because state symbols require it
4. A student heats copper carbonate in an open crucible and finds the mass decreases. What is the best explanation?
- A. Mass has been destroyed, breaking conservation of mass
- B. Carbon dioxide gas has escaped from the open container
- C. The copper carbonate has evaporated completely
- D. The balance was reading incorrectly throughout
5. Which equation correctly uses state symbols for the neutralisation of hydrochloric acid with sodium hydroxide solution, both in solution, producing aqueous sodium chloride and liquid water?
- A. HCl(g) + NaOH(g) -> NaCl(g) + H2O(g)
- B. HCl(aq) + NaOH(aq) -> NaCl(aq) + H2O(l)
- C. HCl(s) + NaOH(s) -> NaCl(s) + H2O(s)
- D. HCl(aq) + NaOH(aq) -> NaCl(s) + H2O(g)