IV. Research and answer the following:
1 A portion of ships are replaced each year. Why?
2. The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the
cylinder it exists as a liquid. When it comes out from the cylinder it becomes a
gas (Change-A) then it burns (Change-B). The following statements pertain to
these changes. Choose the correct one. With propet vreosona
(1) Process - A is a chemical change.
(ii) Process - B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
Anaerobic bacteria digest animal waste and produce biogas (Change -A). The
biogas is then burnt as fuel (Change -B). The following statements pertain to
these changes. Choose the correct one. (NCERT) Loith proper reason
(i) Process - A is a chemical change.
(ii) Process - B is a chemical change.
(ii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
Look at the image given and explain the principle
used in this separation technique.
Water is formed by a combination of hydrogen and oxygen, but if we bring a
burning matchstick near it, neither the oxygen element present in it supports
combustion nor the hydrogen element in it burns with a pop sound, rather water
extinguishes the burning matchstick. Explain the reason.
Answers
Answer:
Explanation:
1.Ships should be maintained properly and they should be taken care of in the more organized manner to take away them from any unwanted and unhappy incidents. that's why to remain them keep working well a portion of ships is replaced with new portion .
2.Both processes A and B are chemical change
a gas change into liquid and vice versa due to chemical reaction on it.
3.Both processes A and B are chemical change
digestion of waste and change into fuel are both chemical reactions.
Answer:
"1. Due to corrosion, the iron parts of the ship become weak due to the active contact of the parts with water and air. This is why some parts of ships are changed regularly, to avoid mishaps.
2. Process A, in this case, is a change of state, whereas process B occurs from combustion, which is a chemical process. Hence, the correct answer to this question is the option (ii) which process B is a chemical change."
Explanation: