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Ilya [14]
3 years ago
8

Write the name of the main gases in the air​

Chemistry
2 answers:
GaryK [48]3 years ago
7 0

Answer:Nitrogen — 78 percent.

Oxygen — 21 percent.

Argon — 0.93 percent.

Carbon dioxide — 0.04 percent.

Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.

Explanation:

Delicious77 [7]3 years ago
3 0

Answer:

Nitrogen

Oxygen

Argon

Carbon Dioxide

Methane

Ozone

Explanation:

N₂ accounts for 78% of the atmosphere.

O₂ accounts for 21% of the atmosphere.

Ar accounts for 0.9% of the atmosphere.

CO₂, CH₄, and O₃ only take up 0.1% of the atmosphere.

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Why does a candle relight if a match is held above the wick just after the flame is<br> blown out?
shutvik [7]

Answer with Explanation:

A candle relights when a match is held above the wick because its trail of smoke still contains some of the wax. When candles are burned, the heat of the flame turns the the wax (which is originally solid) into liquid (commonly near the wick) and then evaporates as gas. The vaporized wax actually protect the wick and this is the reason why it is not burned. So, when you put off a candle, the vaporized wax is still present near the wick. This, remember, holds heat and light energy. Thus, this explains why the candle can be relighted once you hold a match above the wick. It then allows the match to ignite.

Thus, this explains the answer.

5 0
3 years ago
Determine the volume of water to be added to the nitric acid solution at a concentration of 8.61 mol / L to prepare 500 mL of th
Alex_Xolod [135]

Answer:

398 mL

Explanation:

Using the equation for molarity,

C₁V₁ = C₂V₂ where C₁ = concentration before adding water = 8.61 mol/L and V₁ = volume before adding water, C₂ = concentration after adding water = 1.75 mol/L and V₂ = volume after adding water = 500 mL = 0.5 L

V₂ = V₁ + V' where V' = volume of water added.

So, From C₁V₁ = C₂V₂

V₁ =  C₂V₂/C₁

= 1.75 mol/L × 0.5 L ÷ 8.61 mol/L

= 0.875 mol/8.61 mol/L

= 0.102 L

So, V₂ = V₁ + V'

0.5 L = 0.102 L + V'

V' = 0.5 L - 0.102 L

= 0.398 L

= 398 mL

So, we need to add 398 mL of water to the nitric solution.

6 0
2 years ago
How is a pair of molecular orbitals formed?
Montano1993 [528]
When two atoms combine, the overlap of their atomic orbitals produces molecular orbitals. 
3 0
3 years ago
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A highway engineer is researching de-icing compounds for clearing ice from streets in winter. She wants a compound that has +2 i
wolverine [178]

Magnesium combined with chlorine.

How?

  • Look at the question .Compound has -1 charge in it .Hence it contains Halogen.
  • Looking at the options Option B and C contain Iodine and chlorine i.e halogens .

Now come to metals side.

  • Potassium has valency 1(Look the Electronic configuration below)

\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^1

Hence it will contain +1 charge which is omitted directly .

Now come to option C.

  • Magnesium has charge +2(Look at EC below

\\ \sf\longmapsto 1s^22s^22p^63s^2

Hence the compound formed is given by

\\ \sf\longmapsto MgCl_2

Hence option C is correct.

3 0
2 years ago
According to bohr model, why do atoms get larger as you proceed down a group in the periodic table
Mars2501 [29]
Increase the radius of the atom
4 0
3 years ago
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