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Chemistry
Test Description: Review for 8th grade chemistry.
Instructions: Answer all questions to get your test result.
1) To identify an atom like Chlorine, I would need to know ...
A
electrons have a negative charge.
B
that protons equal electrons.
C
the number of protons .
D
neutrons are equal to protons.
2) Why is a normal atom neutral or have no charge?
A
The neutrons, protons and electrodes are all equal.
B
It has valence electrons.
C
The electrons are equal to the neutrons.
D
The protons are equal to the electrons.
3) To understand if an atom will react or bond with another atom, I need to look at...
A
the number of subatomic particles in the nucleus.
B
the atomic mass.
C
the total number of protons.
D
the valence electrons.
4) Metals are found on the _____ side of the periodic table.
A
inside
B
left
C
zig-zag
D
right
5) An Alkali metal is most likely to bond with____.
A
an Alkaline Earth metal.
B
a piece of tape.
C
a Noble Gas
D
a Halogen.
6) When bacteria in your stomach break down starchy food into sugars, it is ________.
A
a physical change
B
a balanced equation.
C
a chemical change
7) Based on the chemical formula, which of these is NOT an organic compound?
A
C3H5(NO3)3
B
Na2CO3
C
CaCO3
D
Ca(OH)2
8) How many atoms are in the formula: Ca(OH)2
A
4
B
6
C
5
D
3
9) How many elements are in the formula: Al2(SO4)3
A
17
B
3
C
14
D
9
10) What are the beginning parts of a chemical reaction called?
A
reactants
B
gas production
C
products
D
odor change
11) Which of the following is an element?
A
H2O
B
calcium carbonate
C
O2
D
SO4
12) A scientist did several experiments in the lab. Which of the following is NOT a chemical reaction?
A
One liquid rose to the top of the flask, and the other liquid settled to the bottom.
B
The blue liquid turned brown and stunk really bad.
C
A gas was formed that he was able to explode.
D
The temperature of the mixed substances increased.
13) What would we look at to determine whether two atoms have similar properties?
A
the atomic number
B
their lifestyles
C
the period
D
the group number
14) Which equation is balanced?
A
Mg + HCl ----------- H2 + MgCl2
B
Fe2 + O2 ---------Fe2O3
C
Al + O2 --------Al2O3
D
2 HgO ----------- 2 Hg + O2
15) The Noble Gases do not bond or react with any atom because ...
A
they are exothermic.
B
they are on the right side of the periodic table.
C
they have 8 valence electrons.
D
they have a full outer shell.
16) This atom has 4 valence electrons and 5 energy levels.
A
Arsenic
B
Zirconium
C
Tin
D
Beryllium
17) When the temperature in a chemical reaction increases, it is ____.
A
endothermic
B
exothermic
C
balanced
18) How many elements are in the product side of this equation? CaCO3--------CaO + CO2
A
3
B
6
C
5
D
10
19) Which of the following is an example of a chemical reaction?
A
Grinding up a piece of meat with your teeth.
B
The Statue of Liberty turning green as the copper rusts.
C
Taking a picture with your cell phone.
D
Opening a Cola and the gas inside rushing out.
20) How many atoms are in this compound? C10H12N4O
A
24
B
25
C
27
D
3
*select an answer for all questions
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