WorksheetsElements and Substances
Total questions: 20
Worksheet time: 12mins
What are molecules?
Molecules are combinations of two or more atoms.
Molecules are the parts that make up atoms
Molecules are the gaseous parts of atoms
Molecules are atoms that have a positive charge
Pure substances are divided into two categories
elements and mixtures
elements and compounds
compounds and mixtures
compounds and pure substances
Elements are made up of how many types of atoms?
more than 1
2
3
1
Water (H2O) is an example of a/an...
element
compound
ion
atom
sodium chloride (salt) is example of ...
atomic substance
molecular substance
ionic substance
alloy
Which one is a compound?
Ni
F
Re
NaCl
How many different elements are in the compound?
12
3
24
6
This picture represents:
atomic substance
molecular substance
ionic substance
alloy
What is the atomic mass of the element?
6
Carbon
12
7
How many neutrons does an Aluminum atom have?
13
14
26
27
The element in the diagram is neutral because...
Number of proton same as number of neutron
Number of electron same as number of proton
Number of electron same as number of neutron
Number of proton same as nucleon number
How are the elements arranged on the periodic table?
Proton number
Atomic mass
Number of neutron
Nuclear number
Which of the following is not a compound?
O
CHO
NaCl
CHLi
The smallest unit of a matter is known as...
particle
compound
element
atom
If two atoms have the same amount of protons, but a different amount of neutrons, they are known as isotopes.
True
False
Element X has 11 electrons.
Which of the following is the correct electron arrangement for element X?
2.9
2.8.1
11
1.1
Ion Cl- has 17 protons. Which of the following is the correct electron arrangement of ion Cl-?
2.8
2.8.2
2.8.8
2.8.7
15. Which of the following is the use of Cobalt-60?
To make pest infertile
Determine the thickness of paper
Estimate the age of archaeological specimens
Destroy cancer cells
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