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WorksheetsCh - Elements and Compounds
Total questions: 20
Worksheet time: 12mins
Pure substances are the substances that have a fixed composition and are homogeneous.
True
False
Which of the following are pure subtances? (You can choose more than one corrcet answer)
Noble gas
Metals
Compounds
Homogeneous mixture
The substance shown in the picture is
Metal
Non-metal
Metalloids
Noble gas
State true or false:
Elements are made up of only one type of atoms.
(a)
Which of the following properties are correct for metals? (You can choose more than one correct answer)
Metals are good conductor of heat and electricity.
They are brittle and dull.
They are non-ductile.
They are malleable.
Which metal exist in liquid state at room temperature?
Sodium
Mercury
Potassium
Gold
Diamond is the hardest substance found on the Earth. Is it metal, non-metal or metalloid?
(a)
Which of the folllowing is used for disinfection of drinking water?
Nitrogen
Oxygen
Hydrogen
Chlorine
If you visit a market at night, you can see lots of colourful and bright signboards. Which of the following non-metal is used in signboards?
Silicon
Neon
Carbon
Hydrogen
Name the element which has properties of both metals and non-metals.
(a)
Noble gases are also called inert gases because
They are highly reactive.
They have eight electrons in the outermost shell.
They do not react with other elements.
The chemical symbol represents
the name of the element and the number of atoms in an element.
the state of an element.
the number of shells in an atom of an element.
The chemical symbol of potassium (a) .
The chemical symbol of gold (a) .
The picture shown represents
Element
Compound
Choose the elements shown in the picture.
Carbon
Hydrogen
Oxygen
Chlorine
State true or false:
The constituent components of a compound do not retain their properties.
(a)
State true or false:
Valency is the combining capacity of the atom of an element.
(a)
Choose the correct chemical formula for Hydrogen Chloride.
HCl
HC
HLC
Does the picture shown represent diatomic molecule or polyatomic molecule?
(a)
