8. How does carbon dioxide extinguish a fire?
9. What makes gaseous fuel better than solid and liquid fuels?
10. If you were a scientist exploring the possibility of life on another planet,
wh
11. What is the difference between a vulnerable species and an endangered species
12. Name one country that lies in the Pacific Ring of fire. Are all earthquakes to be?
13. Why are hydrogen fuel cells not used extensively?
14. What would change if the gravitational force acting on us changed massor
15. What is the difference between green manure and biofertiliser?
Answers
Answer:
Fuel may be solid, liquid or gas. A combustion reaction maybe written as-. (a) Charcoal burns in air to give carbon dioxide and heat.
Answer:
8. Carbon dioxide extinguishes work by displacing oxygen, or taking away the oxygen element of the fire triangle. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.
9.The higher the calorific value of a fuel, the more is its efficiency. The calorific value of gaseous fuels are more. ... And unlike other solid and liquid fuels it does not leaves any ash. and it produces very little air pollution.
10. question incomplete
11.These are different classifications on the chances that the species can become extinct. Vulnerable means that the species is vulnerable to become an endangered species but there is more people can do to prevent it from getting to endangered. Endangered is the stage before critically endangered ( then the extinct).
12. Indonesia, yes
13.Hydrogen is highly flammable - more so than regular fuel - and is harder to contain than oil. This means that any car fitted with a hydrogen fuel cells is a lot more likely to blow up or set on fire if it is exposed to extreme heat, if it breaks down or if it overheats.