{"id":124287,"date":"2021-02-16T05:40:21","date_gmt":"2021-02-16T05:40:21","guid":{"rendered":"https:\/\/www.indcareer.com\/schools\/?p=124287"},"modified":"2023-09-16T01:35:42","modified_gmt":"2023-09-16T01:35:42","slug":"ncert-solutions-for-8th-class-science-chapter-6-combustion-and-flame","status":"publish","type":"post","link":"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-8th-class-science-chapter-6-combustion-and-flame\/","title":{"rendered":"NCERT Solutions for 8th Class Science: Chapter 6-Combustion and Flame"},"content":{"rendered":"\n

NCERT Solutions for 8th Class Science: Chapter 6-Combustion and Flame<\/strong><\/h2>\n\n\n\n

Page No: 75<\/p>\n\n\n\n

Excercise<\/h2>\n\n\n\n

1. List conditions under which combustion can take place.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

The conditions required for combustion to take place are:
\u2192 Presence of a fuel
\u2192 Air (or oxygen)
\u2192 Ignition temperature (minimum temperature at which a substance catches fire).<\/p>\n\n\n\n

2. Fill in the blanks:<\/strong>
(a) Burning of wood and coal causes _________of air.
(b) A liquid fuel used in homes is ___________.
(c) Fuel must be heated to its ___________ before it starts burning.
(d) Fire produced by oil cannot be controlled by _________.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

(a) Burning of wood and coal causes pollution of air.
(b) A liquid fuel used in homes is LPG.
(c) Fuel must be heated to its ignition temperature before it starts burning.
(d) Fire produced by oil cannot be controlled by water.<\/p>\n\n\n\n

3. Explain how the use of CNG in automobiles has reduced pollution in our cities.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Combustion of fuels like petroleum causes formation of un-burnt carbon particles along with carbon monoxide gas. These harmful pollutants enter the air and cause respiratory diseases. Compressed Natural Gas (CNG) produces these harmful products in very less quantity. It is a comparatively cleaner fuel. Therefore, the use of CNG has reduced pollution in our cities.<\/p>\n\n\n\n

4. Compare LPG and wood as fuels.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

LPG<\/strong><\/td>Wood<\/strong><\/td><\/tr>
It has more calorific value about 55000 kJ\/kg<\/td>It has less calorific value about 17000 to 22000 kJ\/kg<\/td><\/tr>
It does not cause any environmental problem.<\/td>On burning wood release unburnt carbon particles which cause diseases such as asthma<\/td><\/tr>
It is smokeless fuel.<\/td>It gives out lot of smoke<\/td><\/tr>
It is easy to store and can be easily transported in cylinders and pipelines.<\/td>It needs a lot of space to store also very difficult to transport.<\/td><\/tr>
Low Ignition temprature<\/td>High Ignition temprature<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

5. Give reasons.<\/strong>
(a) Water is not used to control fires involving electrical equipment.
(b) LPG is a better domestic fuel than wood.
(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

(a) Water is a conductor of electricity, so it can easily conduct electric current and cause danger of electric shocks or short-circuits. Therefore, water can not be used to control the fire involving electrical equipment.
(b) LPG is a better domestic fuel as it does not produce smoke and un-burnt carbon particles, which cause respiratory problems.<\/p>\n\n\n\n

(c) Paper by itself catches fire easily because it has low ignition temperature but when wrapped around an aluminium pipe its temperature is lowered due to aluminium metal absorbing the heat supplied to paper. So it does not catch fire.<\/p>\n\n\n\n

6. Make a labelled diagram of a candle flame.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

\"Zones<\/a><\/figure>\n\n\n\n

7. Name the unit in which the calorific value of a fuel is expressed.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

The calorific value of a fuel is expressed in kilojoules per kilogram (kJ\/kg).<\/p>\n\n\n\n

8. Explain how CO2<\/sub> is able to control fires.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Being heavier than oxygen, CO2<\/sub> covers the fire like a blanket. Since the contact between the fuel and
oxygen is cut off, the fire is controlled.<\/p>\n\n\n\n

9. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Green leaves have a lot of moisture in them. This moisture does not allow them to catch fire easily. However, dry leaves have no moisturein them. Therefore, they catch fire easily.<\/p>\n\n\n\n

10. Which zone of a flame does a goldsmith use for melting gold and silver and why?<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

A goldsmith uses the outer part of the candle flame for melting gold and silver because in this zone the temperature is the highest which helps to melt these metals easily.<\/p>\n\n\n\n

11. In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

The calorific value of fuel is the amount of heat produced by the complete combustion of 1 kg of fuel.
Now,
Heat produced by 4.5 kg of fuel = 180000 kJTherefore, heat produced by 1Kg of fuel = 180000\/4.5 = 1KJ\/Kg
= 40,000 kJ\/kg
Hence, the calorific value of the fuel is 40,000 kJ\/kg.<\/p>\n\n\n\n

12. Can the process of rusting be called combustion? Discuss.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Combustion is a chemical process in which a substance reacts with oxygen and gives out energy during the process in the form of either heat or light or both. Rusting of iron is an exothermic process as heat is released during rusting. Hence, it is a kind of slow combustion.<\/p>\n\n\n\n

13. Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the  outermost part of the flame. Whose water will get heated in a shorter time?<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

The water in the Ramesh’s beaker will heat up in a shorter time. This is because the outermost zone of a flame is the hottest zone, while the yellow zone (in which Abida had kept the beaker) is less hot.<\/p>\n\n\n\n

Chapterwise NCERT Solutions for 8th Class Science<\/h2>\n\n\n\n
Chapter 1 \u2013 Crop Production and Management<\/a><\/td><\/tr>
Chapter 2 \u2013 Microorganisms: Friend and Foe<\/a><\/td><\/tr>
Chapter 3 \u2013 Synthetic Fibres and Plastics<\/a><\/td><\/tr>
Chapter 4 \u2013 Materials: Metals and Non-Metals<\/a><\/td><\/tr>
Chapter 5 \u2013 Coal and Petroleum<\/a><\/td><\/tr>
Chapter 6 \u2013 Combustion and Flame<\/a><\/td><\/tr>
Chapter 7 \u2013 Conservation of Plants and Animals<\/a><\/td><\/tr>
Chapter 8 \u2013 Cell Structure and Functions<\/a><\/td><\/tr>
Chapter 9 \u2013 Reproduction in Animals<\/a><\/td><\/tr>
Chapter 10 \u2013 Reaching the Age of Adolescence<\/a><\/td><\/tr>
Chapter 11 \u2013 Force and Pressure<\/a><\/td><\/tr>
Chapter 12 \u2013 Friction<\/a><\/td><\/tr>
Chapter 13 \u2013 Sound<\/a><\/td><\/tr>
Chapter 14 \u2013 Chemical Effects of Electric Current<\/a><\/td><\/tr>
Chapter 15 \u2013 Some Natural Phenomena<\/a><\/td><\/tr>
Chapter 16 \u2013 Light<\/a><\/td><\/tr>
Chapter 17 \u2013 Stars and the Solar System<\/a><\/td><\/tr>
Chapter 18 \u2013 Pollution of Air and Water<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

About<\/h2>\n\n\n\n

The National Council of Educational Research and Training is an autonomous organization of the Government of India which was established in 1961 as a literary, scientific, and charitable Society under the Societies Registration Act. Its headquarters are located at Sri Aurbindo Marg in New Delhi. Visit the Official NCERT website<\/a> to learn more. <\/p>\n\n\n\n

\n
NCERT Solutions<\/a><\/div>\n\n\n\n
NCERT Solutions for Class 8<\/a><\/div>\n\n\n\n
NCERT Solutions for Class 8 Science<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

NCERT Solutions for 8th Class Science: Chapter 6-Combustion and Flame Page No: 75 Excercise 1. List conditions under which combustion can take place. Answer The conditions required for combustion to take place are:\u2192 Presence of a fuel\u2192 Air (or oxygen)\u2192 Ignition temperature (minimum temperature at which a substance catches fire). 2. Fill in the blanks:(a) Burning […]<\/p>\n","protected":false},"author":302,"featured_media":627580,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"newspack_featured_image_position":"","newspack_post_subtitle":"","newspack_article_summary_title":"Overview:","newspack_article_summary":"","newspack_hide_updated_date":false,"newspack_show_updated_date":false,"footnotes":""},"categories":[1411,58],"tags":[1527],"boards":[1180],"class_list":["post-124287","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-book-solutions","category-class-8","tag-ncert-science-class-8","boards-ncert","entry"],"yoast_head":"\nNCERT Solutions for 8th Class Science: Chapter 6-Combustion and Flame - IndCareer Schools<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for 8th Class Science: Chapter 6-Combustion and Flame Page No: 75 Excercise 1. 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