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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

CaCl2  + Na2CO3  à  NaCl + CaCO3

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

Type full name here.

Type your teacher's name here.

Score=

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