6. State some harmful effects of using fossil fuels? 7. When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished. a. Name the substance X. b. How does this substance extinguish the fire? c. Name another substance which behaves like X. 8. Write a short note on the causes and effects of global warming and acid rain. 9. Draw and label a candle flame with different zones and explain about the zones. 10. Find out the reasons why hydrogen is not used as a fuel although it has very high calorific value. Plz write the answers for all of this
Answers
Answer:
Explanation:
6. Transporting fuels from the mine or well can cause air pollution and lead to serious accidents and spills. When the fuels are burned, they emit toxins and global warming emissions. Even the waste products are hazardous to public health and the environment
7. a) Sodium hydrogen carbonate. (b) The heat of fire decomposes sodium bicarbonate to produce carbon dioxide gas. This carbon dioxide covers the fire like a blanket and cuts off supply of air to the burning substance. Due to this the fire gets extinguished. (c) potassium hydrogen carbonate
8.The effects of global warming or climate damage include far-reaching and long-lasting changes to the natural environment, to ecosystems and human societies caused directly or indirectly by human emissions of greenhouse gases. It also includes the economic and social changes which stem from living in a warmer world. Acid rain restricts global warming by reducing methane emissions from natural wetland areas, suggests a global climate study. Acid rain is the result of industrial pollution, which causes rainwater to carry small quantities of acidic compounds such as sulphuric and nitric acid
10. It is because hydrogen is a highly combustible and it reacts explosively when it comes in contact with air. And hence as a result, storing of the hydrogen gas is difficult and is dangerous at the same time. So, even though hydrogen has the highest calorific value, it is not used as a domestic fuel