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3 years ago

Jerry listed the following process on his notebook:

Chemistry

1 answer:

topjm [15]3 years ago

5 0

Answer:

Explanation:

1. The dew is formed when the water vapor at the atmosphere contacts the leaves, which are at a low temperature, so, the vapor temperature decreases, and the liquid is formed. So, it's a gas to liquid change.

2. Ice cubes are at the solid-state, thus this transformation is solid to a liquid change.

3. The cold juice is at a low temperature, so when the water vapor of the air contacts with the glass, its temperature decreases, and its change to a liquid phase. So, it's a gas to liquid change.

4. The evaporated water from the Earth's surface goes to the atmosphere, and, at high altitudes, the temperature is low, so the water vapor condenses and the drops get closer together forming the clouds. So, it's a gas to a liquid change.

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Imagine two solutions with the same concentration and the same boiling point, but one has ethanol as the solvent and the other h

defon

Answer: m = 0.42; Tb = 79°

Explanation: The relationship between boiling point of the solvent above a solution is directly proportional to the molal concentration of the solute, i.e.:

ΔT = $K_{b}.m$

where

ΔT is the change in boiling point of the solvent;

$K_{b}$ is the molal boiling point elevation constant;

m is the molal concentration of the solute in the solution;

For there two solutions:

1) Ethanol:

ΔT = $K_{b}.m$

Tb - $T_{normal} = K_{b}.m$

Tb - 78.4 = 1.22.m (1)

2) Carbon Tetrachloride:

Tb - $T_{normal} = K_{b}.m$

Tb - 76.8 = 5.03.m (2)

Solving the system of equations:

Tb - 78.4 = 1.22.m

Tb = 1.22.m + 78.4 (3)

Substituing (3) in (2)

1.22.m + 78.4 - 76.8 = 5.03m

3.81m = 1.6

m = 0.42

With m, find Tb:

T - 76.8 = 5.03.0.42

T = 2.11 + 76.8

T = 79°

<u>Molal</u> concentration is <u>0.42</u> and boiling point is 79°

4 0

3 years ago

What are two things affected by friction

11111nata11111 [884]

Answer:

speed and how slidey things are

Explanation:

4 0

3 years ago

How many moles are in 6.4grams of copper

anzhelika [568]

Answer:

One mole of copper atoms has Avogadro number of copper atoms i.e. 6.022×10

atoms.

Given the mass of Copper is 6.4g

Number of Copper atoms in 6.4g =

molar mass

given mass

×Avogadro number

63.55

6.4

×6.022×10

copper atoms

=6.064×10

copper atoms

Explanation:

8 0

3 years ago

Write the IUPAC and common names, if any, of the carboxylate salts produced in the reaction of each of the following carboxylic

Tems11 [23]

Answer:

Following are the explanation to this question:

Explanation:

The salts of carboxylate are named by the writing, which is also named as the creation of the first, which is followed by the name of the carboxylic acid were '-ic' of the acid end and replaced by the 'ate'.

Following are the description of the given reaction:

In reaction A:

2-Bromopropanoic acid= $C_3H_5BrO_2$

$C_3H_5BrO_2+NaOH$ ⇄ $C_3H_4BrNaO_2 +H_2O$

The IUPAC name is Sodium-2-Bromopropanate

In reaction B:

2-Methylhexanoic acid= $C_7H_{14}O_2$

$C_7H_{14}O_2+NaOH$ ⇄ $C_7H_{13}NaO_{2}+H_2O$

The IUPAC name is Sodium-2-Methyl hexanoate

5 0

3 years ago

How many moles of gas at 58° C does it take to fill a 1.75 L flask to a pressure of 12.5 kPa? Please help I will give brainliest

marin [14]

Answer:

0.008 moles of gas are present

Explanation:

Given data:

Volume of gas = 1.75 L

Number of moles = ?

Temperature of gas = 58°C

Pressure of gas = 12.5 KPa

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

Now we will convert the temperature.

58+273 = 331 K

Pressure = 12.5/101 = 0.12 atm

by putting values in formula:

0.12 atm× 1.75 L = n× 0.0821 atm.L/ mol.K ×331 K

0.21 atm.L = n× 27.17atm.L/ mol

n = 0.21 atm.L /27.17atm.L/ mol

n = 0.008 mol

3 0

3 years ago