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प्रश्न
Classify the substances given in Fig. 2.2 into elements and compounds
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उत्तर
Elements – Cu, Zn, F2, O2, diamond (C), Hg
Compounds – CaCO3, H2O,
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संबंधित प्रश्न
Write true or false
All pure substances have characteristic melting and boiling points.
Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements
Tick (√) the correct alternative from the choice given for the following statement.
Sand is a compound of
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
Complete the statement given below by filling in the blanks with the correct words.
Atom contains ________ , with positively charged _____.
Write the names of elements from the following symbol:
Ti
There are ______ number of known elements.
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
Water contains _____ and _____ element.
Reason out
Elements are called semimetals.
