WorksheetsChemistry
Total questions: 20
Worksheet time: 7mins
the fibres obtained from plants and animals are called _________
synthetic fibres
man made fibres
natural fibres
😮!
how many elements does Ozone have?
3
2
4
8
what is the symbol of potassium?
Na
H
K
Ok
P
An element which contains 2 atoms is known as _________
Polyatomic
Diatomic
Triatomic
Monoatomic
which of the following are non-metals?
Platinum
Copper
Oxygen
Helium
Mercury
Chemical industries supply ________ and ________
Pesticides
Fertilizers
Chemicals
Dyes
Synthetic Fibres
Who dicovered Hydrogen?
(a)
How many elements are there in the periodic table till date?
118
94
125
132
Who organized elements according to their weight and chemical reactivity and what is it called?
Dmitri Mendeleev
Antoine Lavoiser
Poriedic Table
Periodic Table
2 or more substances mixed together in any ratio is called as __________
Mixture
Element
Compound
Food
In which method does it change from solid to vapour?
Sublimation
Loading
Magnetic Seperation
Filtration
The chemical used in loading is ___________
Coagulating Agent
Coagulation
Alum
Napthalene
Water is purified in water treatment plants?
True
False
which molecule is this
Nitrogen
Oxygen
Carbon Oxide
Nitrogen Oxide
A chemical substance is used to soften hard water
True
False
Which rays kill the harmful germs in the filtered water?
UV Rays
VU Rays
AV Rays
AC Rays
What is residue
solid left on the filter paper
solid in the filter paper
liquid which passes through the filter paper
liquid right on the filter paper
Filter Paper
Example of seperating solids from solids
Seiving
Sublimation
Loading
Handpicking
Some solids which sublime on heating
Iodine
Calcium oxide
Amonium Chloride
Who is this?
Antoine Van Lavoiser
Pierre Curie
John Dalton
Dmitri Mendeleev
