Last seen: Nov 14, 2021
Brass is a mixture because 1. It does not have a fixed composition. 2. It shows the properties of its constituents.
Mixture consists of two or more different kinds of particles or substances but not chemically bounded. Sugar solution is a mixture because 1. It...
A chemical compound is a substance made up of two or more elements combined together chemically in a fixed proportion by mass. Sodium chloride is a...
Water is a compound because 1. Its composition is fixed and it is inseparable. 2. The property of water is different from its constituents.
Air is a mixture because 1. Its constituents can be separated example: oxygen, nitrogen etc. by physical process. 2. It does not have a fixed boi...
Solutions are sea-water and soda-water remaining is mixtures.
We boil the colourless liquid and if it starts boiling at 100℃ then it might be water. We can check it by checking reactivity with some metals that re...
(a) Copper can be used for making electric wires because they are ductile in nature as copper is a metal. (b) Graphite is a non-metal which has the...
Metals are malleable, ductile and sonorous. Therefore aluminium can be considered as a metal because it possesses these properties.
(i) Malleability - Metals show this property but non-metals don’t. (ii) Ductility - Metals show this property but non-metals don’t. (iii) Electr...
Metals are malleable and ductile that is they can be drawn to thin wires and can be hammered but non-metals are neither malleable nor ductile.
Elements can be divided into metals, non-metals and metalloids. Metals: Aluminium and copper Non-metals: Potassium and calcium Metalloids: Ar...
Hydrogen and oxygen are considered as elements which cannot split into different substances by applying any kind of energy like heat or electricity wh...
Two solid elements at room temp. - Iron and copper Two liquid elements at room temp. - Mercury and bromine Two gaseous elements at room temp. - ...
Air is a mixture because 1. It contains two or more pure substances. 2. By physical processes it can be separated into simpler substance. 3. It...
Elements are Mercury, Iron, Diamond, Nitrogen, Graphite, Hydrogen, Oxygen and chlorine.
Other name for impure substance is Mixture. Examples: Milk and sea water.
Ice, iron, hydrochloric acid, calcium oxide and mercury are the pure substances.
(i) Pure substances which are made up of same kind of atoms. Example: Sulphur (ii) Pure substances which are made up of same kind of molecules. ...
A pure substance is made up of same type of particles or atoms. All the elements and compounds are pure substances because they contain the same kind ...