Law of Conservation of Mass Quiz
1.The starting materials in a chemical reaction are matter products precipitate reactants
2. The new substances formed in a chemical reaction are matter products precipitate reactants
3. An insoluble solid product that falls out of a solution is called matter product precipitate reactant
4. An atom with the same number of protons, but different number of neutrons is called a(an) isotopes elements atoms reactants
5. The number of neutrons in Si-30 is 14 16 28 30
6. The Law of Conservation of Mass states that the mass of the products is greater than the mass of the reactants. the mass of the products is less than the mass of the reactants. the mass of the products is equal to the mass of the reactant. none of the above
7. The mass of a coin is 5.050g. How many significant digits are in this measurement? 2 3 4 none of the above
8. Calculate the mass to the correct number of significant digits. Beaker weighs 12.97 g and the beaker plus the sodium carbonate weighs 14.505g. 1.53g 1.54g 1.5g 1.535g
9. If 2.12g of CaCl2 are mixed with 2.195 g of Na2CO3, what amount of NaCl is produced when 2.9 g of calcium carbonate is found in the filter paper? correct sig figs. 1.415g 1.4g 1.42g 1g
10. What does aq stand for? aqua aqueous liquid wet
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