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प्रश्न
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
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उत्तर
Glucose and Oxygen.
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संबंधित प्रश्न
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
What are chemical reactions?
Is kerosene an electrolyte or a non-electrolyte ?
What do you observe when :
an iron nail is kept in tap water for few days
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Rusting of iron is a ______ chemical change.
State the main characteristics of chemical reactions. Give at least one example in each case.
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Name: A brown gas
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Which of the following is a chemical change?
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
Give two examples for the following case:
Chemical changes
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
