What are disadvantages of using fossil fuels to generate electricity? check all that apply. eventually, fossil fuels will be used up. substances in the smoke from power plants provide health benefits to people who inhale them. obtaining fossil fuels harms the environment. poisonous metals are present in the ash from coal-burning power plants. in some places, coal is abundant.

The fossil fuels are obtained by decomposition of organic matter buried thousands of years ago. So we have a limited supply of fossil fuels available for use and are considered as non renewable source of energy. We cannot generate them again, once exhausted.

a) so eventually the fossil fuels will be used up

b) False : the burning of fossil fuels generate only harmful gases and not useful for health

c) True: extraction of fossil fuel definitely harms the environment.

d) True: there are poisonous metals like aresenic in the ash produced by burning of coal

e) False: this is not a disadvantage that coal is abundant in some places

a,c,d

Explanation:

I just did the assignment, this was the answer on edgenutiy. hope this helps.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)