Worksheetscrystalline and amorphous form of carbon
Total questions: 15
Worksheet time: 23mins
Name
Class
Date
1.
Carbon is a metal.
a)
True
b)
False
2.
What are allotropic forms of carbon also known as
(a)
3.
In which form does carbon exist
a)
Free
b)
Combined
c)
Both
4.
What is the formula of limestone
(a)
5.
Name any allotrope of carbon
(a)
6.
Where is carbon found
a)
Wood
b)
Petrol
c)
Creams
d)
All of these
7.
Crystalline forms of carbon have irregular shape and blunt edges.
a)
True
b)
False
8.
Carbon is found in which of the following complex items
a)
Medicine
b)
Blood
c)
Soap
d)
All of these
9.
What is the formula of sodium bicarbonate
(a)
10.
Which evidence is most convincing that diamonds do not form from coal.
a)
Diamonds formed about 1 to 3 billions years ago and coal formed 300 to 400 million years ago.
b)
Diamonds form at very high temperatures , 900 to 1300 degrees celsius and only at depths of 87 to 120 km.
c)
Diamonds only form in kimberlite and are transported to the surface by deep-source volcanic eruptions
11.
Which is NOT true about diamonds?
a)
it is the hardest known substance
b)
it forms from extreme temperatures and pressure deep in the crust
c)
it is formed from a combination of elements
d)
it is formed only from carbon
12.
Which statement is a true comparison of diamonds and graphite?
a)
diamonds are extremely hard and colorless where as graphite is a very soft gray substance.
b)
diamonds are extremely soft and colorless where as graphite is a very hard gray substance.
c)
Diamonds are made only from carbon where as graphite is a carbon compound
13.
Coal is not the predecessor to diamonds because
a)
it is an impure form of carbon and is rarely buried to the depths greater than 2 miles
b)
it is a pure form of carbon but is not found deep enough in the earth
c)
it is an impure form of carbon and diamonds are a pure colorless form of carbon
14.
Which is used in pencils ?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
15.
Which is used as electrodes in an electrochemical cell?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
100 %
