Pure Substance
Pure Substance: Overview
This topic covers concepts such as Mixtures, Properties of Materials, Properties of Plastic, Properties of Metal, Materials, Burning of Magnesium Ribbon, Molecules of Compounds, Atom, Molecule, Pure Substances, Elements, Compounds, etc.
Important Questions on Pure Substance
What is the name of the gas that helps in the support of combustion?
How much oxygen must be present in the air to support combustion?
_____ present in air supported combustion of wax.
Oxygen is a supporter of combustion.
What are the different physical properties of oxygen?
From the list provided below choose the ones that match the description given.
Ferrous sulphate, Copper carbonate, Triferric tetroxide, Trilead tetroxide, Sulphur dioxide, Carbon dioxide, Lead nitrate. Zinc nitrate, Oxygen, Nitrogen,
A gas that rekindles a glowing splint.
The minute particles of an element or compound which can exist independently and expresses all the characteristics properties of that compound is termed as a _____.
_____ is a group of two or more atoms which are joined together by chemical bond, which cannot be separated by general physical methods.
Define element. Give examples.
Sulphuric acid is an example for compound. Justify.
Identify the compounds in the following:
Soil, Sulphuric acid, Gold, Air, Water, Ammonia, Iron.
The substance formed by the chemical combination of two or more than two elements in a definite ratio is termed as a _____.
Put a spoonful of water in a bowl. Keep it in the sun. Look at the bowl after an hour.
Name four qualities of water.
Write names of things which flow like water.
What are the things like water that we can drink?
Put a spoonful of water in a bowl. Keep it in the sun. Look at the bowl after an hour. Where did the water from the bowl go?
Write down the specialities of water known to you.
