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3 years ago

What is the greatest question facing the human race?

Chemistry

2 answers:

UkoKoshka [18]3 years ago

7 0

Answer:

So, we have the information, the experts and the solutions to the biggest problems facing humanity: climate change, war, loss of jobs due to automation, risk of economic collapse, famine, poverty and overpopulation.

Explanation:

lubasha [3.4K]3 years ago

6 0

Explanation:

Will we put an end to Global Warming and survive?

Will humans ever set foot on Mars? etc.

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Which list includes three forms of energy?

loris [4]

I think the correct answer from the choices listed above is option 1. The list that includes three forms of energy would be chemical, mechanical and electromagnetic. Pressure and temperature are not energy. Hope this answers the question. Have a nice day.

5 0

3 years ago

Read 2 more answers

8. 53.4 mL of a 1.50 M solution of NaCl is on hand, but you need some 0.800 M

bulgar [2K]

8. 100.13 ml
9. 75 ml
10. 1066.7 ml, hope that's help

6 0

3 years ago

How many neutrons does element X have if its atomic number is 31 and its mass number is 80?

MrRissso [65]

49 neutrons in each nucleus.

<h3>Explanation</h3>

For each nucleus:

Mass number = Number of protons + Number of neutrons.

The atomic number of a nucleus is the same as its number of protons. The atomic number of the nucleus here is 31. There are 31 protons in each nucleus.

Mass number = 80;
Number of protons = Atomic number = 31;
The number of neutrons is to be found.

Again,

Mass number = Number of protons + Number of neutrons.

80 = 31 + Number of neutrons.

Number of neutrons = 80 - 31 = 49.

5 0

3 years ago

Which group contains elements that have the following characteristics:

alekssr [168]

Answer:

Explanation:

the answer to you question Is 1)

6 0

3 years ago

Read 2 more answers

Explain how you would decide which represents a greater mass: 3.25 x 1022 atoms of Ca or 2.45 grams of Mg?

elena55 [62]

Answer:

<u>You need to convert the number of atoms of Ca into mass in grams, using Avogadro's number and the atomic mass of Ca.</u>

Explanation:

The amount of matter is measured in grams. Thus, you need to convert the number of atoms of Ca (calcium) into mass to compare with 2.45 grams of Mg.

To convert the atoms of calcium into mass, you divide by Avogadro's number, to obtain the number of moles of atoms, and then divide by the atomic mass of calcium.

<u />

<u>1. Number of moles, n</u>

$n=\dfrac{\text{number of atoms}}{\text{Avogadro's number}}\\ \\ \\ n=\dfrac{3.25\times 10^{22}}{6.022\times 10^{23}}=0.053969mol$

<u />

mass = number of moles × atomic mass

mass = 0.053969mol × 40.078g/mol = 2.16g

Then, 2.45 g of Mg represent a greaer mass than the 3.25 × 10²² atoms of Ca.

4 0

3 years ago