NEW
Font size
Worksheets2021-22_CH_G6_Th2_Un1_ElementsAndCompounds
Total questions: 40
Worksheet time: 20mins
The rare gas used for filling weather observation balloons is __________.
Argon
Krypton
Helium
Neon
The smallest independent unit of matter is the ____________.
element
atom
molecule
compound
The constituents of a compound _____________.
cannot be separated by any means
can be separated by physical means
can be separated by chemical means
can be separated by heating
An element is made up of ___________.
two types of atoms
many types of atoms
one type of atom
one type of molecule
The symbol of a molecule of nitrogen is ______________.
N
N2
2N
N2
At room temperature, bromine exists in ___________.
solid state
liquid state
gaseous state
both (a) & (b)
The metal which exists in liquid state at room temperature is ______________.
Sodium
Magnesium
Mercury
Iron
The Latin name of Sn is
Selenium
Scandium
Stannum
Silicon
A non-metal which has lustre and is a good conductor of electricity is _____________.
iodine
graphite
diamond
mercury
_________ has/have a shiny, metallic appearance but is/are brittle.
Boron
Silicon
Germanium
All of these
The Latin name of silver is __________.
Aurum
Kalium
Stannum
Argentum
Which property of the metal is shown in the given picture:
malleability
ductility
sonority
lustre
Silicon is a _________.
metal
non metal
semimetal
noble gas
Which of the following options is correct?
Statement 1:
A large number of pure substances exist as a cluster having atoms of the same element.
Statement 2:
A large number of pure substances exist as a cluster having atoms of different elements.
Only statement1
Only statement 2
Both statements 1 and 2
Neither statement 1 nor 2
The number of atoms in a molecule of fluorine is
1
2
4
8
The number of molecules of carbon dioxide in 2CO2 is ___________.
1
2
4
3
My latin name is Hydrargyrum. Who am I?
Hydrogen
Sodium
Mercury
Stannum
The number of carbon atoms in 3Na2CO3 is ___________.
1
2
3
4
Elements that are brittle and cannot be rolled into wires are known as ________________.
liquids
non-elastic substances
non-metals
metals
There are ____ number of synthetic elements.
23
12
24
25
Iodine and graphite are both ________.
non-metals and lustrous
metals and good conductors of heat
non-metals and malleable
metals and ductile
What is the symbol of Xenon?
X
Xn
Xe
Xo
Choose the incorrect symbolic representation.
(a) Potassium- K
(b) Sodium- NA
(c) Lead- L
Both (b) & (c)
An example of molecules with different kinds of atoms is __________.
(a) molecule of zinc chloride
(b) molecule of hydrogen
(c) molecule of carbon dioxide
Both (a) & (c)
How many atoms of O are present in one molecule of Ozone?
1
2
3
0
Which of the following atomic symbols is written correctly?
ee
hE
C
CL
Which of the following is a compound?
Co
He
CO
H2
Which of the following represents an element?
H2O
H2
NaCl
CaCO3
A pure substance made of only ONE type of atom is called ______.
molecule
compound
element
mixture
Which term best describes the substance shown?
Atom
Element
Molecule
Compound
State True or False. Are these molecules also compounds?
True
False
Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?
Hydrogen is an element made of two or more kinds of atoms.
Hydrogen is a compound made of only one kind of atom.
Hydrogen is a compound made of two or more kinds of atoms.
Hydrogen is an element made of only one kind of atom.
Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).
Methane is an element and carbon and hydrogen are compounds.
Carbon, hydrogen, and methane are all elements.
Carbon, hydrogen, and methane are all compounds.
Carbon and hydrogen are elements and methane is a compound.
Every compound is a molecule but not every molecule is a compound.
TRUE
FALSE
Which picture represents a molecule?
(1) & (2)
(2) & (3)
(3) & (4)
(1) & (4)
Jewellery is made up of metals because _______.
metals are sonorous, have lustre and are brittle
metals are brittle and have lustre
metals are sonorous and hard
metals have lustre and are hard
Look at the picture given and answer.
Which of the boxes contain only elements but no compounds?
A, D, F
B, C, D
C, E, F
D, B, A
Look at the picture given and answer.
Which of the boxes represent a mixture of compounds?
A, D, C
Only B
Only F
Only E
Look at the picture given and answer.
Which of the boxes represent only molecules?
A, C, D
B, D, E
C, E, F
D, A, F
A spoon becomes hot after being left in a pan of boiling water because the_______.
spoon is made of metal and metals are good conductors of heat.
spoon was not of good quality material.
spoon is made of non metal and is a poor conductor of heat.
water reached its boiling point
