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WorksheetsUnit 2 Review Chemistry
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
Atoms of the same element that differ in the number of neutrons.
a)
Ion
b)
Isotope
c)
Element
d)
Atom
2.
Gas bubbles released or a change in color are signs that a _________change has taken place.
a)
Physical
b)
Nuclear
c)
Positive
d)
Chemical
3.
Can you change the subscripts in chemical formulas as you balance a chemical equation?
a)
Yes
b)
No
4.
How many molecules in .....5 H2O ?
a)
10
b)
5
c)
2
d)
1
5.
How many total atoms in ..... H2SO4 ?
a)
7
b)
3
c)
4
d)
10
6.
How many elements in ..... 5 NaHCO3.
a)
5
b)
15
c)
4
d)
6
7.
What is the maximum number of electrons in the first shell?
a)
8
b)
3
c)
10
d)
2
8.
What is the maximum number of electrons in the second shell?
a)
2
b)
10
c)
8
d)
6
9.
What is the product ?
N2 + 3 H2 ------> 2 NH3
N2 + 3 H2 ------> 2 NH3
a)
N2
b)
3 H2
c)
N2 + 3 H2
d)
2 NH3
10.
What are used to balance chemical equations?
a)
Coefficients
b)
Subscripts
c)
Elements
d)
Scale
11.
Which scientific law states that matter cannot be created or destroyed?
a)
Law of Conservation of Energy
b)
Law of Matter
c)
Law of Conservation of Mass
d)
Law of Gravity
12.
Columns of the modern periodic table are called ______________.
a)
metalloids
b)
metals
c)
groups
d)
periods
13.
Which scientist conducted experiments that led to the law of conservation of mass?
a)
Isaac Newton
b)
Antoine Lavoisier
c)
Albert Einstein
d)
Gregor Mendel
14.
Elements on the far right of the periodic table all have FULL outer shells.
a)
True
b)
False
15.
Substances that start a chemical reaction are called _________.
a)
Acidic
b)
Basic
c)
Products
d)
Reactants
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