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katovenus [111]
3 years ago
11

What is the physical composition of our

Chemistry
2 answers:
NemiM [27]3 years ago
6 0

Answer:

Air is mainly a mixture of two gases.

Explanation:

Air is mainly a mixture of two gases, nitrogen (around 78%) and oxygen (around 21%). It also contains carbon dioxide (around 0.03%), noble gases (around 0.9%), water vapour and a very small amount of other kinds of gases. Air makes up the atmosphere, which is essential for life on Earth.

(FYI, argon has the highest percentage of composition among the noble gases)

IceJOKER [234]3 years ago
5 0

Answer:

The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen

Components of Air - Oxygen, Nitrogen, Carbon dioxide, Water Vapour

Properties of Air

Colourless and Odourless: Air generally has no colour or odour

Occupy space: It is a mixture of different gases

Air exerts pressure: It has weight, and the pressure exerted by the weight of air is known as air pressure

Expansion: Another property is its expanding property.

Explanation:

Hope this helps:)

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Which trends appear as the elements in Period 3 are considered from left to right?
andreev551 [17]

Answer:

Metallic character decreases, and electronegativity increases.

Explanation:

Hello!

In this case, according to the organization of the periodic table, we can see that from left to right, the electronegativity increases as nonmetals are able to attract electrons more easily than metals.

Moreover, in contrast to the previous periodic trend, the metallic character decreases from left to right because the elements tend to decrease the capacity to lose electrons and consequently start attracting them.

Thus, the answer would be: "Metallic character decreases, and electronegativity increases".

Best regards!

8 0
3 years ago
A forensic anthropologist they discovers the bones of a human whose tibia has stopped growing but who's a clavicle appears to ha
yulyashka [42]

Explanation:

  • <em><u>the</u></em><em><u> </u></em><em><u>person</u></em><em><u> </u></em><em><u>was</u></em><em><u> </u></em><em><u>between</u></em><em><u> </u></em><em><u>1</u></em><em><u>3</u></em><em><u> </u></em><em><u>and</u></em><em><u> </u></em><em><u>16</u></em><em><u> </u></em><em><u>years</u></em><em><u> </u></em><em><u>old</u></em>
6 0
3 years ago
Which of the following is an example of a chemical change? A. Boiling water B. Burning paper C. Dissolving sugar in water D. Mel
SpyIntel [72]
It’s B.burning paper
8 0
4 years ago
Read 2 more answers
An aqueous HCL solution has a proton concentration equal to 6.00 mol/L. The HCL concentration in this solution is ————M.
Harman [31]

Answer:

HCl conc.= 6.0mol/L

Explanation:

From the dissociation of HCl= 1 mole H+ and 1mol Cl-, which is equivalent stoichiometrically in concentration to that of 1 mol HCl,

4 0
4 years ago
Please solve this problem. IT IS TOO URGENT ‍♂️​
kirill [66]

Answer:

1. Sulphuric acid

2. Car battery acid

3. Washing up liquid

4. Milk of magnesia

5. Metal polish

6. Oven cleaner

Explanation:

Universal paper can determine the pH of a solution. It ranges from dark red (pH 0 - very acidic) to orange/yellow, to green (pH 7 - neutral) to blue, dark blue and purple (pH 14 - very alkaline)

Sulphuric acid has the lowest pH as the universal indicator is red.

The next is car battery acid which is pink - not as acidic as red.

The next is washing up liquid, which is yellow, around pH 3 or 4.

The next is milk of magnesia with light blue, around pH 9 or 10.

Metal polish is dark blue - around pH 11.

Oven cleaner is the darkest, with purple.

4 0
4 years ago
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