When a hydrocarbon fuel is burned, almost all of the carbon in the fuel burns completely to form co2 (carbon dioxide), which is the principal gas causing the greenhouse effect and thus global climate change. on average, 0.73 kg of co2 is produced for each kwh of electricity generated from a power plant that burns natural gas. a typical new household refrigerator uses about 700 kwh of electricity per year. determine the amount of co2 production that is due to the refrigerators in a city with 300,000 households?

               1.5 × 10⁸ Kg of CO₂ / Year

According to statement,

                        1 kwh generation produces  =  0.73 Kg of CO₂

So,

              700 kwh generation will produce  =  X Kg of CO₂

Solving for X,

                      X =  (700 kwh × 0.73 Kg) ÷ 1 kwh

                       X =  511 Kg of CO₂ / Year

Also, as calculated,

                           1 household produces  =  511 Kg of CO₂ / Year

Then,

                 300,000 households will produce  =  X Kg of CO₂ per Year

Solving for X,

                     X =  (300000 households × 511 Kg) ÷ 1 household

                    X =  153300000 Kg of CO₂ / Year

Or,

                    X  = 1.5 × 10⁸ Kg of CO₂ / Year

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.