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प्रश्न
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
उत्तर
A mixture is an impure substance containing more than one element or compound, mechanically mixed together in any proportion and the mixture retains the properties of its constituents i.e. elements or compounds.
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संबंधित प्रश्न
Give two examples for the following: Metals
Name a soft metal.
Choose the most appropriate answer
A solvent of Iodine is
Fill in the blank
Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.
Name the substance you will add to speed up sedimentation.
Differentiate between:
Homogenous and heterogenous substances
Answer the following question:
Why are copper and aluminium used to make electric wires?
Indicate whether the following statement is true or false:
Metals reflect light and are good conductors of electricity
Tick (√) the correct alternative from the choice given for the following statement.
The most abundant elements in the universe are
Tick (√) the correct alternative from the choice given for the following statement
A non-metal which is a good conductor of electricity.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name - a poisonous gas almost as heavy as air.
Select the correct answer from the choice given below.
An element which is a poor conductor of heat
Write the names of elements from the following symbol:
Zn
Explain the difference between Metals and non-metals.
Non-metal conducting electricity :______ :: Metal conducting electricity : Copper
Give an example for the elements derived from their Latin names.
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
Higher-Order Thinking questions:
Why is hydrogen considered an element?
Reason out
Elements are called semimetals.
