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Answers
photo synthesis is called endothermic reaction because the warm Air in the atmosphere is taken by the plants to produce O2 molecules which cool the atmosphere air.so it's called endothermic reaction.
1. A process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction is called as chemical reaction..
2. Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. ... Use coefficients of products and reactants to balance the number of atoms of an element on both sides of a chemical equation.
3. A physical change is a change in which no new substance is formed while a chemical change results in the formation of one or more new substances. Physical Change:- Change in physical properties of the substance, i.e. shape, size, color etc.
4. When Calcium oxide i.e. quick lime is added to water filled in a bucket, it reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.
5. (i) Change in state
(ii) Change in colour
(iii) Evolution of a gas
(iv) Change in temperature.
6. Unlike many other endothermic reactions, photosynthesis does not absorb energy as heat. Instead, during plants absorb energy from sunlight to turn carbon dioxide and water into oxygen and glucose, which is a type of sugar molecule. The energy is stored in the glucose molecules, ready to be used when needed.
7. Silver articles when exposed to air become black after sometime. This is because the silver metal reacts with sulphur present in the atmosphere and forms silver sulphide (black colour).
8. Metals such as gold (Au) and platinum (Pt) present at the bottom of the activity series do not corrode easily.
9. (i) We apply paint on iron articles so that it doesn't corrode.
(ii) Nitrogen is used while packing because nitrogen doesn't react with the food products.
(iii) When Iron nail (Fe) kept in Copper sulphate (CuSO4) there takes reaction between them. As Iron is more reactive than Copper it can replace Copper from CuSO4. CuSO4 is in blue Colour and FeSO4 is in light green colour. So, there will be change in the composition and colour of the solution (from blue to light green).
10. Combination reaction:-The reaction in which two or more elements or reactants react together to form a single product with entirely different properties is called combination reaction.
Example :-
H2+Cl2=2HCl
Decomposition reaction:-The reaction in which single element breaks down to give two or more products is called decomposition reaction.
Example:-
NaCl= Cl+Na
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