Spanish : asked on pk4mk
 22.01.2021

I have no idea how to even answer this please help.

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Mathematics
Step-by-step answer
P Answered by PhD

A

Step-by-step explanation:

to calculate the slope m of a line use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (0, 0) and (x₂, y₂ ) = (3, 2) ← 2 points on the line

m = \frac{2-0}{3-0} = \frac{2}{3} → A

Chemistry
Step-by-step answer
P Answered by PhD
1) The depression of the freezing point is a colligative property.

For non ionic compounds it may be calculated  with the formula:

ΔTf = Kf * m

Where Kf is the cryoscopic constant of the water = 1.86°C/mol

And m is the molality, m = number of moles of solute / kg of solvent

You have 500.0 g of solvent = 0.5000 kg

And you can calculate the moles in 36.0 g of glucosa dividing  by its molar mass:

number of moles = mass in grams / molar mass = 36.0 g / 180.0 g/mol =  0.2 mol

=> m = 0.2 mol / 0.5000 kg = 0.4 m

=> ΔT = 1.86°C/m * 0.4m = 0.744 °C.

Given that the freezing point of pure water is 0.0°C, the new freezing point is 0°C - 0.744 °C = - 0.744°C

- 0.744 °C

2)  Elevation of boiling point is another colligative property.

It is calculate as:

ΔTb = i * Kb * m.

Whre i is van't Hoff constant, which accounts for the number of ions generated in ionic compounds.

Here, you do not have the i constant, but you can tell that each molecule of KCl dissociates into 2  ions (one K+ and one Cl-) which is to say that i = 2.

Kb is the boiling constant of the solvent, which here is water => Kb = 0.512 °C/m.

You also know the boiling point of the solution as 103.07°C. Given that the normal boiling point of pure water is 100.0°C, ΔT is 103.07°C - 100.0 °C = 3.07°C.

Then you can determine the molality, m = ΔTb / (i*Kb) = 3.07°C / (2*0.512°C/m) = 3.00 °C.

3.0 °C
English
Step-by-step answer
P Answered by PhD

Answer/Explanation:

Blogs are like a journal that people post online. Since you are technically not writing a "real" blog, you may use "WORD", which is Microsoft Word. If you want to use a blog site, you could use "Blogger" for example. It does not matter where you do the blog, as long as you type it out.

Blogs are written in first person, using "I", "me" or "my". They include personal ideas and perspectives.

Writing a blog about your story is like writing a commentary or review about it. Pretend you did not write the story and you have just read it. First, introduce the story with the author and a summarize it. You can include things like plot insights and analyses of your story, your personal opinion of why it was good or bad, or what you thought of the characters.

Remember to include a title, your name, and the date. The formatting does not matter as long as it's logical (near the top somewhere).

If you need some examples or ideas, you can search up "book blogs".

Chemistry
Step-by-step answer
P Answered by PhD
1) The depression of the freezing point is a colligative property.

For non ionic compounds it may be calculated  with the formula:

ΔTf = Kf * m

Where Kf is the cryoscopic constant of the water = 1.86°C/mol

And m is the molality, m = number of moles of solute / kg of solvent

You have 500.0 g of solvent = 0.5000 kg

And you can calculate the moles in 36.0 g of glucosa dividing  by its molar mass:

number of moles = mass in grams / molar mass = 36.0 g / 180.0 g/mol =  0.2 mol

=> m = 0.2 mol / 0.5000 kg = 0.4 m

=> ΔT = 1.86°C/m * 0.4m = 0.744 °C.

Given that the freezing point of pure water is 0.0°C, the new freezing point is 0°C - 0.744 °C = - 0.744°C

- 0.744 °C

2)  Elevation of boiling point is another colligative property.

It is calculate as:

ΔTb = i * Kb * m.

Whre i is van't Hoff constant, which accounts for the number of ions generated in ionic compounds.

Here, you do not have the i constant, but you can tell that each molecule of KCl dissociates into 2  ions (one K+ and one Cl-) which is to say that i = 2.

Kb is the boiling constant of the solvent, which here is water => Kb = 0.512 °C/m.

You also know the boiling point of the solution as 103.07°C. Given that the normal boiling point of pure water is 100.0°C, ΔT is 103.07°C - 100.0 °C = 3.07°C.

Then you can determine the molality, m = ΔTb / (i*Kb) = 3.07°C / (2*0.512°C/m) = 3.00 °C.

3.0 °C
Physics
Step-by-step answer
P Answered by PhD

To decrease friction in machinery, low-friction materials such as Teflon and other plastics are used. Contact surfaces are designed to be smooth as possible. Lubricants are introduced to reduce friction. To decrease drag on an airplane, smooth surfaces and a streamlined design are used.

Chemistry
Step-by-step answer
P Answered by Master

The expression of an equilibrium constant will given as:

K_c=\frac{[NH_3]^2}{[N_2][H_2]^3}

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K_{eq}

K is the constant of a certain reaction when it is in equilibrium

N_2 (g) + 3 H_2 (g)\rightleftharpoons 2 NH_3 (g) + heat

The expression of an equilibrium constant will given as:

K_c=\frac{[NH_3]^2}{[N_2][H_2]^3}

English
Step-by-step answer
P Answered by PhD

Answer/Explanation:

Blogs are like a journal that people post online. Since you are technically not writing a "real" blog, you may use "WORD", which is Microsoft Word. If you want to use a blog site, you could use "Blogger" for example. It does not matter where you do the blog, as long as you type it out.

Blogs are written in first person, using "I", "me" or "my". They include personal ideas and perspectives.

Writing a blog about your story is like writing a commentary or review about it. Pretend you did not write the story and you have just read it. First, introduce the story with the author and a summarize it. You can include things like plot insights and analyses of your story, your personal opinion of why it was good or bad, or what you thought of the characters.

Remember to include a title, your name, and the date. The formatting does not matter as long as it's logical (near the top somewhere).

If you need some examples or ideas, you can search up "book blogs".

English
Step-by-step answer
P Answered by Master
Different narratives they normally it more generally so you will be able to relate to the different parts of the population. Benjamin Frankiln is trying to "make the bitter pill of the truth about human conditions easier to swallow by wrapping it in common figurative language and critizing his critics. 

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