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Worksheetslaw of conservation of matter
Total questions: 17
Worksheet time: 25mins
Name
Class
Date
1.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The Coefficient
2.
This is used to represent the number of each atom being represented.
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
3.
How many hydrogen atoms are in this chemical formula:
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
4.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
5.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
6.
Law of conservation of mass states that
a)
matter is created
b)
matter is destroyed
c)
matter is neither created nor destroyed
d)
matter does not change
7.
What is the law of conservation of mass?
a)
The part of the universe being studied
b)
The rest of the universe that interacts with the system
c)
Within a closed system, mass does not change
d)
A system that freely exchanges matter and energy
8.
What is the law of conservation of mass?
a)
Matter changes when reacted or changed.
b)
The mass of all reactants are changed during a physical or chemical change
c)
The mass of the reactants is the same as the mass of the products
d)
The mass of the products is different than the mass of the reactants.
9.
The Law of Conservation of Matter is the reason a chemical equation MUST be:
a)
balanced
b)
unbalanced
10.
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
a)
4g
b)
5g
c)
9g
d)
14g
11.
The number in front of a compound or element is a
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
12.
Which is Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
13.
If a reaction starts with a total 75g of reactants it should produce
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
14.
In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?
a)
17g
b)
2g
c)
7g
d)
None of the above
15.
32 g of Oxygen completely reacts with 8 g of Hydrogen to produce _____ g Water
a)
8
b)
12
c)
24
d)
40
16.
What is the arrow in a chemical equation...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
17.
Which equation best represents the law of conservation of mass?
a)
A
b)
B
c)
C
d)
D
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