Law of Conservation of Mass Labs Quiz
Quiz by Hugh King
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- Q1
Which statement best describes the Law of Conservation of Mass?
The amount of matter in a chemical reaction is conserved so the total mass increases.
The amount of matter in a chemical reaction does not change so the mass of the reactants should be equal to the mass of the products.
The amount of matter in a chemical reaction can change if a gas is produced because a gas's density is usually less than that of a solid.
During a chemical reaction the matter is conserved therefore the mass decreases.
30s - Q2
In the Law of Conservation of Mass: Mg to MgO lab, the reactants were?
A. Mg
B. O2
C. MgO
D. heat
C and D
A and B
D. only
C. only
30s - Q3
In the Law of Conservation of Mass: Baking soda and Vinegar lab, the product that was aqueous was?
A. C2H4O2
B. NaHCO3
C. NaC2H3O2
D. H2O
C
B
A
D
30s - Q4
What type of reaction was observed in the Law of Conservation of Mass: Mg to MgO lab?
double replacement
decomposition
single replacement
synthesis
30s - Q5
What were the indicators of a chemical reaction observed in the Law of Conservation of Mass: Mg to MgO lab?
a change in energy and a color change
the production of water and the formation of a precipitate
a change in energy and the formation of water
the formation of a precipitate and a color change
30s - Q6
In the Law of Conservation of Mass: Baking soda and Vinegar lab, the gas that was produced was??
C2H4O2
CO2
O2
H2O
30s - Q7
In the Law of Conservation of Mass: Baking soda and Vinegar lab, the mass of the reactants was approximately?
115 grams
5 grams
170 grams
55 grams
30s - Q8
In the Law of Conservation of Mass: Baking soda and Vinegar lab, what would be a reasonable explanation for why the mass of the products was less than the mass of the reactants?
Some of the gas produced may have escaped.
The mass of the balloon was not subtracted from the mass of the products.
Some of the gas produced may have reacted with the balloon deceasing the mass of balloon.
The gas produced was more dense that room air causing the mass to increase slightly.
30s - Q9
In the Law of Conservation of Mass: Mg to MgO lab, what would be a reasonable explanation for why the mass of the reactants was more than the mass of the products?
Some of reactant used was not measured.
Some of the produce got wet because the beaker was not dry.
Some of the product made was not measured.
Some of the product was left over and did not burn.
30s - Q10
What coefficient correctly balance this equation?
___ Mg(s) + ___ O2(g) → ___ MgO(s) + heat
1,2,1
2,1,2
1,2,2
2,2,1
30s - Q11
What coefficient correctly balance this equation for the combustion of methane in a Bunsen burner?
___ CH4(s) + ___ O2(g) → ___ H2O(g) + ___ CO2(g) + heat
1,2,1,2
2,2,1,1
1,2,1,1
1,2,2,1
30s - Q12
A reaction starts with 24 grams of Mg and when the reaction is over 56 grams of MgO is produced. How many grams of oxygen were used?
___ Mg(s) + ___ O2(g) → ___ MgO(s) + heat
24 grams
8 grams
80 grams
32 grams
30s - Q13
In the Law of Conservation of Mass: Baking soda and Vinegar lab, the mass of the flask was approximately?
55 grams
2.2 grams
120 grams
48 grams
30s - Q14
In the Law of Conservation of Mass: Mg to MgO lab, what was the approximate mass of Mg ribbon used?
120.0 grams
1.0 grams
2.2 grams
0.1 grams
30s