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slamgirl [31]
4 years ago
14

Which geologic time did humans exist​

Chemistry
1 answer:
masha68 [24]4 years ago
8 0

<h2><u>PLEASE MARK BRAINLIEST!</u></h2>

It is believed that, 66 million years ago, the first human lived. This is according to fossil. It is thought that, after the Cretaceous–Paleogene extinction [the extinction of dinosaurs and 3/4 of plant and animal life], the first humans appeared.

I hope this helps!

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What is carbonixation ​
nydimaria [60]

Answer:

This has some interesting History in it.

Peat moss was once pounded into a sort of brick; sometimes with a little coal, these bricks were put to dry, and used for fuel.

The “Historical” part is in the name. I won’t go into why, ‘cause I type so slow and it is “extra”, but the peat, or coal, being TRULY organic, (that is made from plants) and burned as fuel is called “carbonixation”.

Explanation: Sort of a “Carbon + Oxidation”; many things in Chemistry have strange names that seem at first to make no sense; like “essence of Hartshorn”, is Ammonia (or ammonium hydroxide). A Hart is/was a type of deer in England and that area, and amines in the horn, when distilled, would yield Ammonia, “The Essence of Hartshorn”. Even the term “aromatic” has a long History, as do many compounds and nomenclature.

I hope that will do it.

8 0
3 years ago
Arrange elements in decreasing order of the number of valence electrons
meriva

Answer:

It’s voice and a

Explanation:

3 0
3 years ago
Gases are measured in different units. Which of the following measurements of pressure are equal? Select all that apply.
viva [34]

Explanation:

Pressure of a gas is the combined force with which the molecules bombard a unit area of the wall of the container.

    1 atm  = 760mmHg

               = 760torr

               = 101325Pa

               = 101325Nm⁻²

 1mmHg  = 1torr

        1Pa = 1Nm⁻²

101.325 kPa  and 101,325 Pa are the same

           1000Pa = 1kPa

101,325 Pa  and 1 atm

1atm and 101.325 kPa

6 0
3 years ago
- A jackrabbit's powerful legs are an example of a
dusya [7]

Answer:

I think it is b.

Explanation:

8 0
3 years ago
Read 2 more answers
Indicate the types of forces that are involved between the solute and solvent when forming a homogeneous solution between CH3CH2
Sliva [168]

Answer:

London dispersion forces

Explanation:

Intermolecular forces are the forces that facilitate interaction between solute and solvent molecules and thereby impact their solubility. These forces are broadly classified into four types arranged below from the strongest to the weakest:

1) Ionic > 2) Hydrogen bonding >3) Dipole-dipole >4) London dispersion

The hydrocarbons n-pentane CH_{3}CH_{2}CH_{2}CH_{2}CH_{3} and n--hexane CH_{3}CH_{2}CH_{2}CH_{2}CH_{2}CH_{3} are non-polar molecules. Therefore the only type of interaction that exists between them when forming a homogeneous solution are the weak london dispersion forces.

4 0
3 years ago
Read 2 more answers
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