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3 years ago

Question 2 Describe the energy in coal and the way in which it’s converted to electrical energy.

Chemistry

1 answer:

Scilla [17]3 years ago

7 0

Answer:

Its rich carbon content gives coal most of its energy content. When coal is burned in the presence of air or oxygen, heat energy is released. This energy can then be converted to other forms of useful energy. Coal-fired plants produce electricity by burning coal in a boiler to produce steam. The steam produced, under tremendous pressure, flows into a turbine, which spins a generator to create electricity.

Hope this helps! :)

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8th grade science

morpeh [17]

Answer:

Copper and Iron

Explanation:

Metals, like copper and iron, are good conductors of heat; that is because metals are bounded by a 'cloud' of free electrons and these electrons can carry easily kinetic energy through the metal

On the other hand, foam and wood are isolators, that is, they are bad conductors of heat.

4 0

3 years ago

Read 2 more answers

At a festival, spherical balloons with a radius of 280. Cm are to be inflated with hot air and released. The air at the festival

evablogger [386]

Answer:

8608.18 balloons

Explanation:

Hello! Let's solve this!

Data needed:

Enthalpy of propane formation: 103.85kJ / mol

Specific heat capacity of air: 1.009J · g ° C

Density of air at 100 ° C: 0.946kg / m3

Density of propane at 100 ° C: 1.440kg / m3

First we will calculate the propane heat (C3H8)

3000g * (1mol / 44g) * (103.85kJ / mol) * (1000J / 1kJ) = 7.08068 * 10 ^ 6 J

Then we can calculate the mass of the air with the heat formula

Q = mc delta T

m = Q / c delta T = (7.08068 * 10 ^ 6 J) / (1.009J / kg ° C * (100-25) ° C) =

m = 93566.96kg

We now calculate the volume of a balloon.

V = 4/3 * pi * r ^ 3 = 4/3 * 3.14 * 1.4m ^ 3 = 11.49m ^ 3

Now we calculate the mass of the balloon

mg = 0.946kg / m3 * 11.49m ^ 3 = 10.87kg

The amount of balloons is

93566.96kg / 10.87kg = 8608.18 balloons

5 0

3 years ago

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An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing 50 grams of an alloy that contains 52% copper wi

AleksandrR [38]

Answer:

a) 128 grams

b) 81.25%

Explanation:

a) The mixture will be between the alloy and the pure copper, so the mass will be the sum of the mass of the compounds:

m = 50 + 78 = 128 g

b) In the alloy, 52% is copper, so to know the mass of copper in the alloy, we must multiply the total mass by 52% (which is 0.52)

0.52x50 = 26 g of copper

The total mass of copper in the mixture is 26 + 78 = 104 g

So, the percentual of copper is the mass of copper divided by the total mass

104/128 = 0.8125

Multiplying by 100%, to have the result in percentage

0.8125x100% = 81.25%

4 0

3 years ago

K2O+H2O=KOH<br> What,if anything, should be done to balance this chemical equation?

VladimirAG [237]

As is, the equation has:

Reactants:
2 K
2 O
2 H

Products:
1 K
1 O
1 H

So, we can add coefficients to balance the equation:
K2O + H2O = 2KOH

The coefficient means that there are 2 moles of KOH, and now the equation is balanced as there is 2 of everything on both sides.

4 0

4 years ago

Liquids and solids are referred to as “condensed phases” because the attractive forces are?

Anna11 [10]

<span>leave little space between the molecules.</span>

3 0

4 years ago

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