WorksheetsG8 UWCSEA G7 Chem Review
Total questions: 32
Worksheet time: 22mins
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.
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
12.
A solid has
a)
Tightly packed particles
b)
Free flowing particles
c)
No particles at all
d)
Plasma
13.
True or False: Elements cannot be broken down
a)
True
b)
False
14.
A mixture is
a)
a combination combined physically but not chemically
b)
a combination combined physically and chemically
c)
a combination combined neither chemically or physically
d)
a combination combined chemically but not physically
15.
The basic unit of matter is
a)
a mixture
b)
a substance
c)
an atom
d)
a compound
16.
Carbon and oxygen atoms can combine to form the gas called carbon dioxide.
a)
is a molecule, so it no longer has atoms
b)
is a molecule made of atoms
c)
has atoms, so it is not a molecule
d)
is a new kind of atom
17.
The smallest unit of an element that still has the properties of that element is?
a)
a substance
b)
a mixture
c)
a compound
d)
an atom
18.
Which of these is a pure substance?
a)
bread
b)
table salt
c)
garden soil
d)
sea water
19.
Which of these is an example of a molecule?
a)
a small nugget of pure gold
b)
the smallest grain of salt in a salt shaker
c)
a small drop of sugar water
d)
two oxygen atoms joined to a carbon atom
20.
Which of these is not an example of a molecule?
a)
CH4
b)
C
c)
C6H12O6
d)
H2O
21.
The smallest unit of a compound that still has the properties of that compound is?
a)
an atom
b)
a molecule
c)
a mixture
d)
a substance
22.
Are there any compounds on the periodic table
a)
yes there are many
b)
no because only elements are on the periodic table
c)
I think they are?
23.
Which one has more than one type of atom in it
a)
Element
b)
Compound
24.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
25.
How is a compound different from a mixture?
a)
Solids, liquids, and gases can form compounds
b)
Each substance in a compound loses its characteristic properties
26.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
27.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
28.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
29.
The positive particles of an atom are
a)
electrons
b)
positrons
c)
neutrons
d)
protons
30.
the central region of an atom where its neutrons and protons are is its
a)
nucleus
b)
electron cloud
c)
core
d)
center
31.
Particles in an atom that are neutral and have no charge are
a)
negatrons
b)
electrons
c)
neutrons
d)
protons
32.
A particle that moves around the nucleus is a(n)...
a)
Proton
b)
Neutron
c)
Electron
d)
Quark
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