CHEMISTRY HIGH SCHOOL

State in term of molecular polarity why ethanol is soluble in water

Answers

Answer 1
Answer:

Explanation:

As we all know that like disolves in like solvent.

Here both water and Ethanol are polar. Hence Ethanol soluble in water.

Moreover, both forms intermolecular hydrogen bonds. It enhances the solubility of ethanol.

Both water and Ethanol are called as associate liquids. Hence solubility is more.
Answer 2
Answer:

Alcohols have higher boiling point than other hydrocarbons due to their polarity and from the fact that they form very strong intermolecular hydrogen bonding. This is due to the large difference in their electronegativity that forms between the oxygen and the hydrogen atom. 

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Which iron pot has the least thermal energy?A. A5 kg pot at 130°C
B. A 2 kg pot at 120°C
C. A 5kg pot at 25°C
D. A 2 kg pot at 25°C

Answers

Final answer:

The 2 kg pot at 25°C has the least thermal energy because it has both a smaller mass and a lower temperature than the other options.

Explanation:

The thermal energy of an object is related to both its mass and its temperature. In this case, we are considering iron pots of different masses and temperatures. Given the options, the 2 kg pot at 25°C would have the least thermal energy. This is because it has both a smaller mass and a lower temperature than all the other options listed.

The thermal energy is calculated by multiplying the mass, specific heat, and change in temperature. An object with a smaller mass and lower temperature would therefore have less thermal energy.

Learn more about Thermal Energy here:

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Answer: D. A 2 kg pot at 25C.

Explanation:

What is the mass of 2.50 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?

Answers

Two things are given to us: The "molar mass" of NaOH and the number of molecules of NaOH. 

The molar mass is different from "mass"; 1 mole of NaOH is equal to 40.0g/mol.
When the question asks, what is the mass? It is referring to how many grams there are. 

First, we are going to convert the molecules to atoms using Avogadro's number (=6.02 x 10^23)

(2.50 x 10^22 molecules) x (6.02 x 10^23 atoms) = 0.042 mol

Next, we are going to convert from moles to grams.

 0.042 mol of NaOH x 40.0 g of NaOH/1 mole = 1.68g of NaOH.

There are 1.68 grams in 2.50 x 10^22 molecules of NaOH.

Hello!

What is the mass of 2.50 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?

Data:

Molar Mass of NaOH = 40 g/mol

Solving: According to the Law Avogradro, we have in 1 mole of a substance, 6.02x10²³ atoms/mol or molecules

1 mol -------------------- 6.02*10²³ molecules

y mol -------------------- 2.50*10²² molecules

(1)/(y) = (6.02*10^(23))/(0.250*10^(23))

Product of extremes equals product of means

6.02*10^(23)*y = 0.250*10^(23)*1

6.02*10^(23)\:y = 0.250*10^(23)

y = (0.250*10^(23))/(6.02*10^(23))

\boxed{y \approx 0.042\:mol}

Solving: Find the mass value now

40 g ----------------- 1 mol of NaOH

x g ------------- 0.042 mol of NaOH

x = 40*0.042

\boxed{\boxed{x = 1.68\:g}}\end{array}}\qquad\quad\checkmark

Answer:

The mass is 1.68 grams

_______________________

I Hope this helps, greetings ... Dexteright02! =)

125 cm3 of a solution contains 0.25 moles of the solute. What is the concentration of the solution?

Answers

Answer:

Explanation:

125 cm3 -> 0.125 L

M = no. mole / volume (L)

M = 0.25 / 0.125 = 2 M

What are transferred in an oxidation-reduction reaction

Answers

hydrogen atoms or electrons

Answer:

C. Electrons

Explanation:

How many moles of copper are equivalent to 3.44 × 1023 atoms of copper?

Answers

3.44x10^23 divided by 6.02x10^23 equals 0.571 mol Cu.

if 1200 j of heat were absorbed by a 25 g block of iron, by how much would the temperature of the iron increase?

Answers

m = mass of the block of iron = 25 g

Q = heat absorbed by the block of iron = 1200 J

ΔT = increase in the temperature of iron due to heat absorbed = ?

c = specific heat of block of iron = 0.450 J/(g C)

Heat absorbed by the block of iron is given as

Q = m c ΔT

inserting the values in the above formula

1200 = 25 (0.450) ΔT

1200 = (11.25) ΔT

ΔT = 1200/11.25

ΔT = 106.67 C
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