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3 years ago

The Periodic Table is arranged according to?

Chemistry

2 answers:

Serhud [2]3 years ago

7 0

Answer:

The number of protons each element has.

Explanation:

The periodic table is arranged by atomic number, which is the number of protons in the nucleus of each element.

lesya692 [45]3 years ago

5 0

Answer:

The number of protons each element has.

Explanation:

<u>The number of protons each element has is also known as the atomic number.</u> Elements are arranged from left to right and top to bottom in order of increasing atomic number. The order generally coincides with increasing atomic mass. The rows are called periods.

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Select the correct characteristics describing normal-phase and reversed-phase chromatography. Normal-phase chromatography Revers

qwelly [4]

Answer:

(a) Polarity of phase: 1. Stationary phase is polar

b) Eluent strength of solvent: 1. Increases as solvent becomes more polar

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e) Polarity of phases: 1. Stationary phase is polar

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2 years ago

1. Which of the following is a type of chemical used in fertilizer?

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#1 is phosphate , #2 is pesticides, #3 is geometric settings, dominant water source as precipitation ,ground water , or surface water.and hydrobodynamics.#4 is microbiology.#5 is c, #6 is D,#7 is d

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3 years ago

At 20 ?C the vapor pressure of benzene (C6H6)is 75 torr, and that of toluene (C7H8) is 22 torr

tia_tia [17]

Answer:

(a) Benzene = 0.26; toluene = 0.74

(b) Benzene = 0.55

Explanation:

1. Calculate the composition of the solution

For convenience, let’s call benzene Component 1 and toluene Component 2.

According to Raoult’s Law,

$p_{1} = \chi_{1}p_{1}^{\circ}\\p_{2} = \chi_{2}p_{2}^{\circ}$

where

p₁ and p₂ are the vapour pressures of the components above the solution

χ₁ and χ₂ are the mole fractions of the components

p₁° and p₂° are the vapour pressures of the pure components.

Note that

χ₁ + χ₂ = 1

So,

$\begin{array}{rcl}p_{\text{tot}} &=& p_{1} + p_{2}\\p_{\text{tot}} & = & \chi_{1}p_{1}^{\circ} + (1 - \chi_{1})p_{2}^{\circ}\\36 & = & \chi_{1}\times 75 + (1 - \chi_{1}) \times 22 \\36 & = & 75\chi_{1} + 22 -22\chi_{1}\\14 & = & 53\chi_{1}\\\chi_{1} & = & \mathbf{0.26}\\\end{array}$

χ₁ = 0.26 and χ₂ = 0.74

2. Calculate the mole fraction of benzene in the vapour

In the liquid,

p₁ = χ₁p₁° = 0.26 × 75 mm = 20 mm

∴ In the vapour

$\chi_{1} = \dfrac{p_{1}}{p_{\text{tot}} } = \dfrac{\text{20 mm} }{\text{36 mm}} = 0.55$

Note that the vapour composition diagram below has toluene along the horizontal axis. The purple line is the vapour pressure curve for the vapour. Since χ₂ has dropped to 0.45, χ₁ has increased to 0.55.

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3 years ago

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ale4655 [162]

Answer:

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Explanation:

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3 years ago