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nordsb [41]
3 years ago
10

Why are all of the substances on the periodic table classified as elements?

Chemistry
1 answer:
natta225 [31]3 years ago
6 0

Because just like compounds, the table of chemicals can be looked at as having all the different pieces of it.  So the different chemicals are the different "elements" to the periodic table.

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When performing labratory experiments, which of the following items is ALWAYS necessary to use?
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A sample of nitrogen occupies 10.0 liters at 25°C what would be the new volume at 20°C? 7.9 L Ob 9.8 L 10.2 L 10.6 L
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Answer:

  9.4 liter

Explanation:

1) Data:

V₁ = 10.0 L

T₁ = 25°C = 25 + 273.15 K = 298.15 K

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 T₂ = 20°C = 20 + 273.15 K = 293.15 K

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2) Formula:

Used combined law of gases:

  PV / T = constant

  P₁V₁ / T₁ = P₂V₂ / T₂

3) Solution:

Solve the equation for V₂:

  V₂ = P₁V₁ T₂ / (P₂ T₁)

Substitute and compuite:

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V₂ = 98.7 KPa × 10.0 L × 293.15 K / (102.7 KPa × 298.15 K)

V₂ =  9.4 liter ← answer

You can learn more about gas law problems reading this other answer on

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Answer :

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In the Lewis-dot structure the valance electrons are shown by 'dot'.

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The number of lone pairs of electrons around the hydrogen atom = 0

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