Thai Sikh International School
E-Learning Programme – Online
Assignment – 7/11/2014
Name
: Subject :science
1. Write down the chemical symbols for the elements.
Iron: ___________ Aluminium: __________
Copper: ___________ Magnesium: __________
Calcium: ___________ Sodium: __________
Plutonium: __________ Silver: __________
2. Complete the following sentences.
a. All
matter is made up of tiny invisible particles called ……………………………
b. An
……………….. is a chemically charged particle.
c. When
electron is lost the atom is termed ……………………. Charged.
d. The
……………………….. ……………………. Of a molecule shows the number and types of atoms
contained in it.
e. Compounds
such as sodium chloride are made up of…………………….
3. State True or False for the
following sentences.
a. The proton and electron number is same
in an atom…………………………..
b. The helium atom has two proton and one
neutron in the nucleus……………………..
c. All electrons are positively charged
sub-atomic particles…………………………..
d. When atoms gain electrons they become
positively charged…………………………
e. Plastics are made from long chain of
molecules joined together…………………..
4. Answer the following questions in two or
three sentences
a. The chemical
formula for carbon dioxide is CO2. List all the information
you can infer
from this..
………………………………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………………………………..
b. What is the use of
chemical symbols and formula?
………………………………………………………………………………………………………………………………….......
………………………………………………………………………………………………………………………………………………
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