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प्रश्न
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
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उत्तर
Metals: Mercury, sodium, magnesium, copper
Non-metals: Diamond, sulphur, iodine, carbon, helium
Metalloids: Arsenic, germanium, boron
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संबंधित प्रश्न
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Give reason why graphite is used for making elecrode in a dry cell.
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
What are the three general classes of matter ? Give one example of each type.
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
How much water should be mixed with 12 mL of alcohol so as to obtain 12 % alcohol solution ?
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Name the process by which all the dye can be recovered from black ink.
The dyes present in fountain pen ink can be separated by the technique of :
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Wipe the board with a duster and then tap the duster against the table. What do you see?
______ is a smallest particle.
Liquids cannot be compressed and they have fixed volume.
Gases change to liquid by the process of ______.
The physical state of water at 373 K is ______.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
Define the term matter.
