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3 years ago

What is liquid nitrogen

2 answers:

7 0

Liquid nitrogen is nitrogen in a liquid state at an extremely low temperature. It is a colorless clear liquid with a density of 0.807 g/ml at its boiling point (−195.79 °C (77 K; −320 °F)) and a dielectric constant of 1.43.

Diano4ka-milaya [45]3 years ago

3 0

Liquid nitrogen is nitrogen in a liquid state at an extremely low temperature. It is a colorless clear liquid with a density of 0.807 g/ml

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What is the name given to the ions of the halogens on the periodic table?

WARRIOR [948]

Answer:

halides

Explanation:

This is one electron away from having a full octet of eight electrons, so these elements tend to form anions having -1 charges, known as halides: fluoride, F-; chloride, Cl-, bromide, Br-, and iodide, I-. In combination with other nonmetals, the halogens form compounds through covalent bonding.

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3 years ago

Resumen de la alquimia farmaceutica

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Answer: English??

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3 years ago

Fossil fuels are used to generate most of the electricity used on Earth. But where do they come from? Watch this video to gain a

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Answer: Now that you see to some extent bit about place nonrenewable fuel sources come from, can you analyze in what way or manner the Sun’s light strength is ultimately being the reason for the strength in fossil fuels? Describe the way that light strength must enjoy become the synthetic strength in fossil fuels and therefore energetic energy. (Hint: Think about by means of what plants in an environment take their energy.)

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2 years ago

What force in Newtons is needed to accelerate a 40 kg mass across a surface at 7.5 m/sec²?

jeka94

According to Newton's laws, the relationship between acceleration and mass and force is F=ma.
40kg×7.5m/s²=300N
so the answer is 300N.

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3 years ago

Polymers are large molecules composed of simple units repeated many times. Thus, they often have relatively simple empirical for

elena55 [62]

Answer:

(a) $C_5H_8O_2$

(b) $CHCl$

(d) $CH$

(e) $C_3H_3N$

Explanation:

Hello,

(a) For the lucite, one computes the moles of C, H and O that are present:

$n_C=0.599gC*\frac{1molC}{12gC}=0.05molC\\n_H=0.0806gH*\frac{1molH}{1gH}=0.0806molH\\n_O=0.32gO*\frac{1molO}{16gO}=0.02molO\\$

Now, dividing each moles by the smallest moles (oxygen's moles), one obtains:

$C=\frac{0.05}{0.02} =2.5;H=\frac{0.0806}{0.02} =4;O=\frac{0.02}{0.02} =1$

Finally, we look for the smallest whole number subscript by multiplying by 2, so the empirical formula turns out into:

$C_5H_8O_2$

(b) For the Saran, one computes the moles of C, H and Cl that are present:

$n_C=0.248gC*\frac{1molC}{12gC}=0.021molC\\n_H=0.02gH*\frac{1molH}{1gH}=0.02molH\\n_{Cl}=0.731gCl*\frac{1molCl}{35.45gCl}=0.021molCl\\$

Now, dividing each moles by the smallest moles (hydrogen's moles), one obtains:

$C=\frac{0.021}{0.02} =1;H=\frac{0.02}{0.02} =1;Cl=\frac{0.021}{0.02} =1$

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

$CHCl$

$n_C=0.86*\frac{1molC}{12gC}=0.072molC\\n_H=0.14gH*\frac{1molH}{1gH}=0.14molH$

Now, dividing each moles by the smallest moles (carbon's moles), one obtains:

$C=\frac{0.072}{0.072} =1;H=\frac{0.14}{0.072} =2$

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

$CH_2$

(d) For the polystyrene, one computes the moles of C and H that are present:

$n_C=0.923*\frac{1molC}{12gC}=0.077molC\\n_H=0.077gH*\frac{1molH}{1gH}=0.077molH$

Now, dividing each moles by the smallest moles (either carbon's or hydrogen's moles), one obtains:

$C=\frac{0.077}{0.077} =1;H=\frac{0.077}{0.077} =1$

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

$CH$

(e) For the orlon, one computes the moles of C, H and N that are present:

$n_C=0.679*\frac{1molC}{12gC}=0.057molC\\n_H=0.057gH*\frac{1molH}{1gH}=0.057molH\\n_N=0.264gN*\frac{1molN}{14gN}=0.019molN$

Now, dividing each moles by the smallest moles (nitrogen's moles), one obtains:

$C=\frac{0.057}{0.019} =3;H=\frac{0.057}{0.019} =3;N=\frac{0.019}{0.019} =1$

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

$C_3H_3N$

Best regards.

3 0

3 years ago