CBSE Class 7 Geography - Physical and Chemical Change
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Chapter 6 : Physical and Chemical Change
Fill in the blanks :
1. Changes that lead to the formation of new substances are called ________________
2. Melting of candle wax is a______________ change but its burning is a ______________ change.
3. Growth of a plant is a ____________ change while formation of clouds is a _____________ change.
4. A brown layer formed when an iron article is left exposed in air in an open area is called ___________
5. Large crystals of pure substance are obtained by _____________
6. The brown layer deposited on an iron nail dipped in copper sulphate solution is due to ______________
Name the following
1. Write the chemical formula of lime water.
2. Write the chemical name of Mg(OH)2
3. Write the chemical name and formula of rust.
4. Write the chemical name of blue vitriol.
Complete the following chemical reactions :
1. Magnesium oxide (MgO) + water (H2O) ______________
2. Iron (Fe) +oxygen (O2 ) + water (H2O) ________________
3. Carbondioxide ( CO2) + Lime water [Ca(OH)2] _______ + _______
4. Copper sulphate + Iron ______________ + _________________
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