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3 years ago

How is coal extracted? How do Humans use it? What are the benefits?

Chemistry

1 answer:

marishachu [46]3 years ago

4 0

Coal is extracted by mining.

Once coal has been extracted, it can be used directly for heating and industrial processes or to fuel power plants for electricity.

Benefits are:

Coal energy is an affordable energy source because of the coal's stable price compared to other fuel sources.

Coal is easy to burn.

Coal produces high energy upon combustion.

Coal energy is inexpensive.

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Which of the following is a physical change? A) sawing a piece of wood in half. B) burning a piece of wood. C) rust forming on a

algol13

The on that is considered a physical change is : A. Sawing a piece of wood in half

When you cut a piece of wood, the chemical compound within the wood will not change at all, which mean that it's a physical change

hope this helps

5 0

3 years ago

Which part of the flower produces seeds? (992 points)

Nata [24]

Answer:

The pistil, B.

Explanation:

The seeds are formed from the ovule which is contained in the ovary; all in the base, the pistil.

5 0

3 years ago

Sam believes the rock is more denser than the pencil. He measured the mass of the rock to be 8.5 grams and volume to be 4.5mL. H

mezya [45]

Answer:

Rock

Explanation:

Let's calculate the density of each object:

Rock:

$Density = \frac{mass}{volume}=\frac{8.5\ g}{4.5\ mL}=1.9\ g/mL$

Pencil:

$Density = \frac{mass}{volume}=\frac{2.4\ g}{4.5\ mL}=0.53\ g/mL$

Therefore the rock is denser.

6 0

3 years ago

Can anyone help with number 8.

Stels [109]

A tornado! I think or it could be rain

7 0

3 years ago

Why is it important that there is only a small amount of water in the beaker

natita [175]

Answer:

because too much can neutralise the results

4 0

4 years ago

Read 2 more answers