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2 years ago

Does the solubility increase whenever the temperature does?

1 answer:

6 0

<span>The solubility of solutes is dependent on temperature. When a solid dissolves in a liquid, a change in the physical state of the solid analogous to melting takes place. Heat is required to break the bonds holding the molecules in the solid together. At the same time, heat is given off during the formation of new solute -- solvent bonds.</span>

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Q1. Calculate the amount of copper produced in 1.0 hour when aqueous CuBr2 solution was electrolyzed by using a current of 4.50

OLga [1]

Answer:

$\boxed{\text{Q1. 3.6 g; Q2. 0.2 A}}$

Explanation:

Q1. Mass of Cu

(a) Write the equation for the half-reaction.

Cu²⁺ + 2e⁻ ⟶ Cu

The number of electrons transferred (z) is 2 mol per mole of Cu.

(b) Calculate the number of coulombs

q = It

$\text{t} = \text{1.0 h} \times \dfrac{\text{3600 s}}{\text{1 h}} = \text{3600 s}\\\\q = \text{3 C/s} \times \text{ 3600 s} = \textbf{10 800 C}$

(c) Mass of Cu

We can summarize Faraday's laws of electrolysis as

$\begin{array}{rcl}m &=& \dfrac{qM}{zF}\\\\& = &\dfrac{10 800 \times 63.55}{2 \times 96 485}\\\\& = & \textbf{3.6 g}\\\end{array}\\\text{The mass of Cu produced is $\boxed{\textbf{3.6 g}}$}$

Note: The answer can have only two significant figures because that is all you gave for the time.

Q2. Current used

(a) Write the equation for the half-reaction.

Ag⁺ + e⁻ ⟶ Ag

The number of electrons transferred (z) is 1 mol per mole of Ag.

(a) Calculate q

$\begin{array}{rcl}m &=& \dfrac{qM}{zF}\\\\2.00& = &\dfrac{q \times 107.87}{1 \times 96 485}\\\\q &=& \dfrac{2.00 \times 96485}{107.87}\\\\& = & \textbf{1789 C}\\\end{array}$

(b) Calculate the current

t = 3 h = 3 × 3600 s = 10 800 s

$\begin{array}{rcl}q&=& It\\1789 & = & I \times 10800\\I & = & \dfrac{1789}{10800}\\\\& = & \textbf{0.2 A}\\\end{array}\\\text{The current used was $\large \boxed{\textbf{0.2 A}}$}$

Note: The answer can have only one significant figure because that is all you gave for the time.

4 0

2 years ago

What metals are more reactive than mercury choose all that apply

Valentin [98]

Answer: Silver is a metal that are more reactive than mercury.

Given from ; https://brainly.in/question/9583105

5 0

3 years ago

2.0g divided by 34.0 g times 100% equals what?

Lubov Fominskaja [6]

Answer: $\frac{1}{17}$

Explanation: \frac{2}{34}\cdot \:100\%\:=\frac{1}{17}

I tried my best, I hope this helps!

7 0

2 years ago

PLEASE HELP BEFORE 7 A.M. PACIFIC TIME <br> SEE ATTACHED.

anastassius [24]

For i: 33mL
For ii: 87-88mL
For iii:22.3mL

5 0

2 years ago

Read 2 more answers

Explain what might happen to tundra animals, such as polar bears, as earth's climate warms. pls explain

SCORPION-xisa [38]

Answer:

They will die.

Explanation:

Polar Bears were made to live in the frigid temperatures of the tundras. If there is a temperature change it can affect their habitat. It can destroy it and they would have to move out to another place. They can die due to global warming.

8 0

2 years ago