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Conservation Of Mass
Test Description: Science
Instructions: Answer all questions to get your test result.
1) What is the name given to the elements or compounds on the left side of the equation?
A
Ending
B
Reactants
C
Starters
D
Products
2) What is the name given to the elements or compounds on the right side of the equation?
A
Ending
B
Beginning
C
Reactants
D
Products
3) If there are 5 g of carbon on the reactants side, how many g of carbon should you have in the products?
A
4g
B
5g
C
10g
D
0g
4) How many atoms of O are in the reactants: H2+ O2 → H2O (numbers are subscripts)
A
0
B
2
C
4
D
1
5) Identify the reactants in the equation: HgO → Hg + O2
A
HgO
B
O2
C
Hg
D
Hg + O2
6) Identify the products in the equation: HCl + NaOH → H2O + NaCl
A
H2O
B
H2O + NaCl
C
HCl + NaOH
D
NaCl
7) Which is not evidence that a chemical reaction has occurred?
A
gas formation
B
shape change
C
temperature change
D
sound produced
8) How many grams of reactant are needed to complete the reaction: ____ g + 15 g → 40 g
A
30g
B
0g
C
25g
D
20g
9) 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
It occurred in an open system and gas escaped into the air.
C
There is no reasonable explanation.
D
Suzie disproved the Law of Conservation of Mass.
10) How many grams of product are needed to complete the reaction: 10 g + 15 g → ____g
A
30g
B
25g
C
0g
D
5g
11) If a chemical reaction begins with 5 atoms of Chlorine in the reactants, how many chlorine atoms will be present in the products?
A
20 atoms
B
5 atoms
C
10 atoms
D
0 atoms
12) 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
*select an answer for all questions
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