WorksheetsScience
Total questions: 7
Worksheet time: 4mins
Name
Class
Date
1.
Where are protons found?
a)
Electron cloud
b)
nucleus
c)
cell membrane
d)
mitochondrion
2.
Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?
a)
Helium
b)
Argon
c)
Krypton
d)
Chlorine
3.
What is the atomic number of Oxygen?
a)
8
b)
15.999
c)
16
d)
5
4.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
formation of gas
c)
melting
d)
freezing
5.
What is the charge of an electron?
a)
neutral
b)
positive
c)
negative
6.
What is a precipitate?
a)
a change in color
b)
a change in temperature
c)
a solid is formed
d)
a gas is formed
7.
What is the molecular formula of table salt?
(a)
100 %
