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3 years ago

As NH4Cl dissolves in water, and cools the solution,

Chemistry

1 answer:

azamat3 years ago

5 0

Answer:

d. delta H is positive, and delta S is positive

Explanation:

The process of dissolution of NH4Cl is:

NH4Cl(s) → NH4+(aq) + Cl-(aq)

As the solution is cooled, the process is absorbing energy, that means ΔH > 0. (ΔH < 0 when the heat is released).

As there are produced 2 ions from 1 solid molecule, the disorder is increasing and ΔS > 0

The right answer is:

<h3>d. delta H is positive, and delta S is positive</h3>

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An interpenetrating primitive cubic structure like that of CsCl with anions in the corners has an edge length of 664 pm. If the

san4es73 [151]

Answer:

the ionic radius of the anion $r^- = 312.52 \ pm$

Explanation:

From the diagram shown below :

The anion $Cl^-$ is located at the corners

The cation $Cs^+$ is located at the body center

The Body diagonal length = $\sqrt{3 \ a }$

∴ $2 \ r^+ \ + 2r^- \ = \sqrt{3 \ a} \\ \\ r^+ +r^- = \frac{\sqrt{3}}{2} a$

Given that :

$\frac{r^+}{r^-} =0.84$ (i.e the ratio of the ionic radius of the cation to the ionic radius of

the anion )

$0.84r^- \ + r^- \ = \frac{\sqrt{3}}{2}a \\ \\ 1.84 r^- = \frac{3}{2}a \\ \\ r^- = \frac{\sqrt{3}}{2*1.84}a$

Also ; a = 664 pm

Then :

$r^- = \frac{\sqrt{3} }{2*1.84}*664 \ pm\\ \\ r^- = 312.52 \ pm$

Therefore, the ionic radius of the anion $r^- = 312.52 \ pm$

4 0

3 years ago

Match each of Earth's spheres with its definition.

insens350 [35]

Answer:

Thin layer of gases suspended in the air surrounding.

Explanation:

Atmosphere, mark me brainlist.

7 0

3 years ago

Read 2 more answers

Name the bonds found between amino acids in a polypeptide chain

Anon25 [30]

Answer:

Explanation:

dunno

3 0

3 years ago

One gram of glass will rise 20° C when------------calories of heat are applied

astra-53 [7]

Answer:

3.2 Calories

Explanation:

Here we will use a formula

Heat added in calories = Mass of glass x Increase in temperature x specific heat of glass

As we know that, specific heat is the amount of energy required to raise the temperature of one gram of any substance by 1°C. It has a constant value for every substance and for glass the specific heat is .16 calories/gm

Incorporating the values of mass (m), temperature(T) and specific heat (c) in formula.

calories (small calories) = l.0 g x 20 degrees x .16 calories/gm/°C

= 3.2 calories

Hope it helps:)

6 0

4 years ago

Two identical balloons are inflated to a volume of 1.00 L with a particular gas. After 12 hours, the volume of one balloon has d

ratelena [41]

Answer:

43.7

Explanation:

Volume of gas = 1.00L

Time = 12 hours

Decrease in 1 balloon = 0.200L

Decrease in second balloon = 0.0603L

R1 = rate at which helium diffuses= 0.20/12= 0.0166

R2 = rate at which heavier gas diffuses = 0.0693/12 = 0.00502

Using grahms law

R1²/R2² = m/4

= 0.0166²/0.00502² = m/4

= 10.935 = m/4

When we cross multiply

m is the molar mass of heavier gas = 43.73

5 0

4 years ago