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WorksheetsElements, compounds and Mixtures (8- T)
Total questions: 50
Worksheet time: 50mins
Name
Class
Date
1.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
2.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
3.
Salt has a chemical formula of NaCl. Salt is a...
a)
Compound
b)
Element
c)
Mixture
d)
None of the Above
4.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
5.
What is made up two or more elements that are chemically combined?
a)
Element
b)
Mixture
c)
Compound
d)
Solids
6.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
7.
A combination of substances that are not chemically combined is called a(n)____________.
a)
mixture
b)
compound
c)
physical
8.
Mixtures are separated through ___________changes.
a)
mixture
b)
compound
c)
physical
9.
An element is made up of only one kind of _____.
a)
isotope
b)
plastic
c)
atom
d)
metal
10.
_____ small particles that make up most types of matter on Earth.
a)
compounds
b)
atoms
c)
mixtures
d)
elements
11.
In general, metals are _____.
a)
poor conductors of heat
b)
brittle
c)
poor conductors of electricity
d)
good conductors of heat
12.
Vertical columns in the periodic table are called _________ of elements and have similar properties.
a)
groups
b)
periods
13.
The horizontal rows on the periodic table are known as
a)
periods.
b)
atoms.
c)
groups or families.
d)
valence electrons.
14.
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
15.
The blue numbers in the image below are called ___________.
a)
compounds
b)
coefficients
c)
subscripts
d)
chemical formulas
16.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
17.
A pure substance that cannot be separated into simpler substances by chemical or physical means.
a)
Element
b)
Compound
c)
Mixture
d)
Chemical
18.
These contain only one kind of atom.
a)
element
b)
compound
c)
mixture
d)
water
19.
A compound is made of ________ atoms.
a)
big
b)
similar
c)
different
20.
Carbon Dioxide is a ______
a)
compound
b)
element
c)
mixtures
d)
Battle of Bunker Hill
21.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
22.
Salt water boils and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?
a)
Compound
b)
Element
c)
Mixture
d)
None of the Above
23.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
24.
Iced Tea (with ice in it)
a)
Element
b)
Compound
c)
Heterogenous Mixture
d)
Solution
25.
Pizza
a)
Element
b)
Compound
c)
Heterogenous Mixture
d)
Solution
26.
Salt Water
a)
Element
b)
Compound
c)
Heterogeneous Mixture
d)
Solution
27.
Italian dressing is a
a)
solution
b)
suspension
c)
colloid
28.
Milk is a
a)
solution
b)
suspension
c)
colloid
29.
When elements form mixtures, the elements keep their original properties.
a)
True
b)
False
30.
Which of the following would be an example of a chemical formula:
a)
C6H12O6
b)
F= ma
c)
2 H2 + O2 -> 2 H2O
d)
6.02 x 10 23
31.
What is Fe?
a)
Boron
b)
Fluorine
c)
Francium
d)
Iron
32.
How many different elements are in this chemical formula: C2H2ClK3
a)
6
b)
8
c)
2
d)
4
33.
Which of the following atomic symbols is written correctly?
a)
OH
b)
oH
c)
fe
d)
H
34.
Which of the following is a pure substance?
a)
CO
b)
C02
c)
Co
d)
H2O
35.
Which of the following is a pure substance?
a)
O2
b)
Al2CO5
c)
C6H12O6
d)
SiO2
36.
Which of the following atomic symbols for bromine is written correctly?
a)
bR
b)
BR
c)
Br
d)
br
37.
Which of the following chemical formulas represents a compound?
a)
C3
b)
O2
c)
CH3CHO
d)
H2
38.
Can be found on the periodic table
a)
Element
b)
Compound
c)
MIxture
39.
What is krypton?
a)
element
b)
compound
c)
mixture
40.
What is gold?
a)
element
b)
compound
c)
mixture
41.
What is sugar?
a)
element
b)
compound
c)
mixture
42.
What is water?
a)
element
b)
compound
c)
mixture
43.
When two or more elements chemically combine
a)
element
b)
compound
c)
mixture
d)
solution
44.
Which one can be found on the periodic table?
a)
Compound
b)
Element
45.
Which item on this element square is the chemical symbol?
a)
Copper
b)
29
c)
Cu
d)
63.546
46.
What element is found in all four areas of the earth that we studied?
a)
Sodium (Na)
b)
Oxygen (O)
c)
Carbon (C)
d)
Nitrogen (N)
47.
This element occurs in large amount in the atmosphere and small amount in living things.
a)
Nitrogen
b)
Oxygen
c)
Argon
d)
Carbon
48.
Which statement best describes an element?
a)
made from mixture
b)
thousands in the world
c)
pure, made of only one atom
d)
can be separated
49.
Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is –
a)
a gas at room temperature.
b)
made of two different elements.
c)
given off by green plants.
50.
Compounds are different than elements because compounds are -
a)
A combination of two or more elements.
b)
B)not able to be broken down into parts
B)not able to be broken down into parts
c)
made from the same type of atoms
d)
a pure substance, elements are not
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