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attashe74 [19]
3 years ago
9

Why is mining for coal a long-term concern?

Chemistry
2 answers:
Delvig [45]3 years ago
8 0

Answer:

B

Explanation:

Coal is a non-renewable resource, so the supply can't produce faster than we can mine it.

Step2247 [10]3 years ago
8 0

Answer: Is B: the supply will eventually be exhausted.

Explanation:

there is only so much coal in the world as in many other elements. That is why we are looking for more appropriate and resourceful way of supplying energy and it is a lot safer for the workers involved

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How many electrons in an atom could have n = 2, l = 1, ml = 0?
Ivenika [448]
Since the magnetic quantum number can only go from −l to +l , you'll have these values for ml.
ml=−2,−1,0,+1,+2.
SInce each of these orbitals can hold a maximum of two electrons.
7 0
4 years ago
Which temperature is equal to 120. K?<br> (1) -153°C (3) +293°C<br> (2) -120.°C (4) +393°C
Marysya12 [62]
First of all, the formula for finding Kelvin is Celsius + 273
Therefore, if we subtract 273, we get the temperature in degrees
120 - 273 = - 153

Therefore, the answer is (1), or -153 degrees Celsius

Hope this helped!! :D
3 0
3 years ago
Es una mezcla de gases que rodea la Tierra​
DENIUS [597]

Answer:

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8 0
3 years ago
TRUE OR FALSE QUESTIONS
s344n2d4d5 [400]

1: <u>FALSE</u> The physical properties of metals include <u>shininess</u>, malleability, ductility, and conductivity.

2: <u>FALSE</u> Neutrons are the particles in an atom that have a <u>neutral charge</u>. They aren't positive like protons. They aren't negative like electrons.

3: <u>TRUE</u> Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements. He is also known as the <u>"father of the periodic table" </u>

6 0
3 years ago
Read 2 more answers
For a sample of stomach acid that is 2.02×10−2 M in HCl, how many moles of HCl are in 14.6 mL of the stomach acid?
GaryK [48]

Answer:

0.0002949 moles

Explanation:

Concentration = 2.02×10−2 M

Volume = 14.6 mL = 0.0146 L (Upon converting to litres)

Number of moles = ?

These variables are related by the fllowing equation;

Concentration = Number of moles / Volume

Number of moles = Concentration * Volume

Number of moles = 2.02×10−2 * 0.0146 = 0.0002949 moles

8 0
3 years ago
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