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2 years ago

Help on 2 and 3 due tomorrow pls help

Chemistry

1 answer:

Luda [366]2 years ago

4 0

Answer:

b= they are grouped differently, but all the atoms are still there.

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Can sugar and water be separated using distillation?

Bogdan [553]

Answer:

Yes.

Explanation:

Because distillation separates substances based on their different boiling points.

8 0

3 years ago

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Does adding 1 mol of NaCl to 1 kg of water lower the vapor pressure of water to the same extent, a lesser extent, or a greater e

igor_vitrenko [27]

Answer:

Adding 1 mol of NaCl to 1 kg of water lower the vapor pressure of water <em><u>to the same extent</u></em> by adding 1 mol of $C_06H_{12}O_6$ to 1 kg of water.

Explanation:

1) Moles of NaCl , $n_1=1 mol$

Mass of water = m= 1 kg = 1000 g

Moles of water = $n_2=\frac{1000 g}{18 g/mol}=55.55 mol$

Vapor pressure of the solution = $p$

Vapor pressure of the pure solvent that is water = $p_o=17.5 Torr$

Mole fraction of solute(NaCl)= $\chi_1=\frac{n_1}{n_1+n_2}$

$\frac{p_o-p}{p_o}=\frac{n_1}{n_1+n_2}$

$\frac{17.5 Torr-p}{17.5 Torr}=\frac{1 mol}{1 mol+55.55 mol}$

$p=17.19 Torr$

The vapor pressure for the NaCl solution at 17.19 Torr.

2) Moles of sucrose , $n_1=1mol$

Mass of water = m = 1 kg = 1000 g

Moles of water = $n_2=\frac{1000 g}{18 g/mol}=55.55 mol$

Vapor pressure of the solution = $p'$

Vapor pressure of the pure solvent that is water = $p_o=17.5 Torr$

Mole fraction of solute ( glucose)= $\chi_1=\frac{n_1}{n_1+n_2}$

$\frac{p_o-p}{p_o}=\frac{n_1}{n_1+n_2}$

$\frac{17.5 Torr-p}{17.5 Torr}=\frac{1 mol}{1 mol+55.55 mol}$

$p'=17.19 Torr$

The vapor pressure for the glucose solution at 17.19 Torr.

p = p' = 17.19 Torr

Adding 1 mol of NaCl to 1 kg of water lower the vapor pressure of water to the same extent by adding 1 mol of $C_06H_{12}O_6$ to 1 kg of water.

3 0

3 years ago

So I have an F in science, and everything is due today. Am I going to fail 9th grade because I didn't pass that class?

Elis [28]

Answer:

i dk how ur school works, but you'll most likely have to take that science again to get the credits u need to graduate

Explanation:

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3 years ago

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HELP When a scientist thinks of a reason for why he or she observed something, this reason is called _______.

nydimaria [60]

Answer:

an inference

Explanation:

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3 years ago

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Which general trends in first ionization energy and electronegativity values are demonstrated by group 15 elements as they are c

MaRussiya [10]

Answer: (1) The first ionization energy decreases and the electronegativity decreases

Explanation:

When we move from top to bottom in a periodic table the atomic size of elements increases and it becomes easy to remove valence electron from the elements at low energy.Thus decrease in ionisation energy from top to bottom.

Metallic character increases as we move down into a group of a periodic table and metals have low electronegativity than non-metals. So, value of electronegativity decreases from top to bottom.

3 0

3 years ago