NEW
Font size
S
M
L
XL
Worksheets8th Grade Science Q2 Review
Total questions: 49
Worksheet time: 41mins
Name
Class
Date
1.
Particles in an atom that are neutral and have no charge are
a)
negatrons
b)
electrons
c)
neutrons
d)
protons
2.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
3.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
4.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
5.
Which of the following is a negatively charged subatomic particle?
a)
Electron
b)
Proton
c)
Neutron
d)
Quark
6.
If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?
a)
12 neutrons
b)
12 electrons
c)
12 protons
d)
24 protons and neutrons
7.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
8.
(Element or Compound)
C2H8O
C2H8O
a)
Element
b)
Letters
c)
Numbers
d)
Compound
9.
In this compound structure of alcohol, how many Hydrogen atoms are there?
a)
2
b)
4
c)
6
d)
8
10.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
11.
2H2 + O2 --------> 2H2O What are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
12.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
13.
The majority of an atom's mass exists where?
a)
In the nucleus
b)
In the electron cloud
c)
In the space between the nucleus and the electrons
d)
In the neutrons
14.
Which of the following has a full valence shell?
a)
Oxygen
b)
Neon
c)
Barium
d)
Carbon
15.
Sand and gravel may be separated from each other through using..
a)
a filter funnel
b)
a sieve
c)
an evaporating basin
d)
a distillation
16.
Which one of the following solids is insoluble in water?
a)
sugar
b)
sand
c)
copper sulfate
d)
salt
17.
Sodium chloride can be separated from rock salt by first adding water to the mixture to dissolve the sodium chloride. The separation then takes place in two stages:
a)
evaporation followed by filtration
b)
distillation followed by decanting
c)
filtration followed by evaporation
d)
filtration followed by decanting
18.
Which one of the following would you use to separate sand from iron filings?
a)
a bar magnet
b)
filter paper
c)
chromatography paper
d)
alum
19.
What is a substance that is dissolved in another substance?
a)
solution
b)
solute
c)
solvent
d)
compound
20.
If I added 27 grams of salt to water and separated the solution with a hot plate, what amount of salt would be left behind?
a)
20 grams
b)
0 grams
c)
27 grams
d)
10 grams
21.
Sausage and Mushroom Pizza
a)
Heterogeneous
b)
Homogeneous
c)
A compound
22.
Lemonade
a)
Heterogeneous
b)
Homogeneous
c)
A compound
23.
Sugar
a)
Heterogeneous
b)
Homogeneous
c)
A compound
24.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
25.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
26.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
27.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
28.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
29.
Vertical columns in the periodic table are called _________ of elements and have similar properties.
a)
groups
b)
periods
30.
The horizontal rows on the periodic table are known as
a)
periods.
b)
atoms.
c)
groups or families.
d)
valence electrons.
31.
What is H2SO4
made up of?
made up of?
a)
2 hydrogen, 1 sulfur, 4 oxygen
b)
1 hydrogen, 2 sulfur, 4 oxygen
c)
2 hydrogen & 4 sodium
d)
1 hydrogen & 6 sodium
32.
The blue numbers in the image below are called ___________.
a)
compounds
b)
coefficients
c)
subscripts
d)
chemical formulas
33.
Which group of the periodic table is composed of inert (not reactive) gases?
a)
alkali metals
b)
alkaline earth metals
c)
halogens
d)
noble gases
34.
The atoms along the staircase are called
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
35.
Which is an alkali metal?
a)
Magnesium
b)
Iron
c)
Sodium
d)
Europium
36.
Which two families on the periodic table react aggressively?
a)
noble gases and alkali metals
b)
alkali metals and halogens
c)
noble gases and halogens
d)
metals and halogens
37.
Which elements have the most similar chemical properties?
a)
K and Na
b)
K and Ca
c)
K and Cl
d)
K and S
38.
Which of the following is not a property of metals?
a)
brittle
b)
malleable
c)
lustrous
d)
conductive
39.
How many electrons do atoms need to be stable?
a)
1
b)
2
c)
6
d)
8
40.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
41.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
42.
Balance this equation
_N2 + _H2 --> _NH3
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
43.
Balance this equation-
_SeCl6+_O2>_SeO2+_Cl2
_SeCl6+_O2>_SeO2+_Cl2
a)
1,2,1,2
b)
1,1,1,3
c)
1,2,1,1
d)
2,1,1,1
44.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
45.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
46.
What does the green represent in the atmosphere?
a)
nitrogen
b)
oxygen
c)
water vapor
47.
What does the blue represent in the atmosphere?
a)
nitrogen
b)
oxygen
c)
water vapor
48.
Our atmosphere is a(n) _____________________.
a)
element
b)
compound
c)
mixture
49.
What percentage of our atmosphere is made up of other gases such as argon, water vapor, and carbon dioxide?
a)
1%
b)
21%
c)
78%
d)
90%
Reset
