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- 1. Open Ended
Does this chemical equation follow the Law of Conservation of Mass? Use evidence from the equation to support your response.
H2 + O2 → H2O
- 2. Multiple Choice
How many total atoms of chlorine are there in 2NaCl2?
1
2
3
4
- 3. Multiple Choice
Which equation supports this model?
2H2 + O2 → 2H2O
H2 + O2 → 2H2O
2H2O2 → 2H2O
2H2 + O2 → H2O
- 4. Multiple Choice
Balance this equation:
Al + O2 → Al2O3
2Al + O2 → Al2O3
4Al + O2 → 2Al2O3
4Al + 3O2 → 2Al2O3
2Al + 2O2 → 4Al2O3
- 5. Open Ended
Balance this equation and then calculate the total atomic mass of the reactants and products.
H2 + O2 → H2O
- 6. Multiple Choice
Which number represent a coefficient in this equation?
Cl6 + Na6 → 3Cl2Na2
2
3
6
8
- 7. Open Ended
How many atoms of oxygen are on each side of the chemical equation?
4FeS + 7O2 → 2Fe2O3 + 4SO2
- 8. Open Ended
Does this reaction follow the Law of Conservation of Mass? Explain.
- 9. Multiple Choice
Jackie and Josh wanted to do an experiment to demonstrate the Law of Conservation of Mass. To do this, they measured the mass of baking soda and vinegar (reactants) and received a mass of 35g. Then, they mixed the two substances and after the reaction, the mass was measured at 33g. What is the possible explanation as to why the mass was not the same before and after the reaction?
Mass was destroyed in the reaction.
They did not measure correctly.
The students did not include an instrument to capture the gas produced in the reaction.
These two substances do not react so nothing would have happened.
- 10. Fill in the Blank
The number written below and to the right of a chemical symbol that shows the number of atoms present in that element is called the _____.
- 11. Multiple Choice
True or False
In a chemical equation, the reactants are on the left and the products are on the right.
True
False
- 12. Open Ended
Balance this chemical equation:
SnO2 + H2 → Sn + H2O
- 13. Multiple Choice
How many sulfur atoms are on the reactant side of the equation?
Ca3(PO4)2 + 2H2SO4 → 2CaSO4 + Ca(H2PO4) 2
2
3
4
8
- 14. Multiple Choice
How many molecules of HCl are in this equation:
Zn + 2HCl → ZnCl2 + H2
1
2
3
4
- 15. Multiple Choice
What is the approximate atomic mass of one atom of magnesium?
24
55
95
258
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