Conservation Of Mass Question Preview (ID: 41378)


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What is the name given to the elements or compounds on the left side of the equation?
a) Products
b) Reactants
c) Starters
d) Ending

What is the name given to the elements or compounds on the right side of the equation?
a) Ending
b) Beginning
c) Products
d) Reactants

If there are 5 g of carbon on the reactants side, how many g of carbon should you have in the products?
a) 10g
b) 4g
c) 0g
d) 5g

How many atoms of O are in the reactants: H2+ O2 → H2O (numbers are subscripts)
a) 4
b) 2
c) 1
d) 0

Identify the reactants in the equation: HgO → Hg + O2
a) O2
b) Hg + O2
c) HgO
d) Hg

Identify the products in the equation: HCl + NaOH → H2O + NaCl
a) HCl + NaOH
b) H2O + NaCl
c) H2O
d) NaCl

Which is not evidence that a chemical reaction has occurred?
a) gas formation
b) temperature change
c) shape change
d) sound produced

How many grams of reactant are needed to complete the reaction: ____ g + 15 g → 40 g
a) 25g
b) 30g
c) 0g
d) 20g

After an experiment, Suzie measures the mass of the products and finds that the products are less than the reactants. What is the best explanation for this?
a) The experiment occurred in a closed system and molecules could not escape.
b) There is no reasonable explanation.
c) It occurred in an open system and gas escaped into the air.
d) Suzie disproved the Law of Conservation of Mass.

How many grams of product are needed to complete the reaction: 10 g + 15 g → ____g
a) 5g
b) 25g
c) 0g
d) 30g

If a chemical reaction begins with 5 atoms of Chlorine in the reactants, how many chlorine atoms will be present in the products?
a) 10 atoms
b) 0 atoms
c) 20 atoms
d) 5 atoms

The Law of Conservation of Mass states...
a) mass is always created and destroyed during a chemical reaction
b) mass can never be created or destroyed during a chemical reaction
c)
d)

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