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2 years ago

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Why must humans find substitutes for many minerals found on Earth? (A) form at an extremely slow rate (B) controlled by other co

untries (C) too deep in the Earth to collect

1 answer:

DochEvi [55]2 years ago

3 0

The correct answer is C, too deep in the Earth to collect. Hope this helps!

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Potassium impart purple colour but beryllium do not impart any colour to the flame.Why?

BaLLatris [955]

Answer:

<h2>The electrons in beryllium and magnesium are too strongly bound to get excited by flame. Hence, these elements do not impart any color.</h2>

6 0

2 years ago

250 mL of a solution of calcium oxalate is the evaporated until only a residue of solid calcium

Lana71 [14]

Answer:

2.3 * 10^-5

Explanation:

Recall that the solubility of a solute is the amount of solute that dissolves in 1 dm^3 or 1000cm^3 of solution.

Hence;

Amount of calcium oxalate = 154 * 10^-3/128.097 g/mol = 1.2 * 10^-3 mols

From the question;

1.2 * 10^-3 mols dissolves in 250 mL

x moles dissolves in 1000mL

x = 1.2 * 10^-3 mols * 1000/250

x= 4.8 * 10^-3 moldm^-3

CaC2O4(s) ------->Ca^2+(aq) + C2O4^2-(aq)

Hence Ksp = [Ca^2+] [C2O4^2-]

Where;

[Ca^2+] = [C2O4^2-] = 4.8 * 10^-3 moldm^-3

Ksp = (4.8 * 10^-3)^2

Ksp = 2.3 * 10^-5

4 0

2 years ago

Ayudameeeee Jorge AhAaaAA

Gelneren [198K]

Ok what you want. I got u

5 0

2 years ago

Read 2 more answers

An ionic compound contains

hodyreva [135]

Answer:

an ionic compound contains ions

Explanation:

7 0

3 years ago

Two voltaic cells are to be joined so that one will run the other as an electrolytic cell. In the first cell, one half-cell has

stiks02 [169]

Au³⁺ metal ion is reduced in the Au/Cr cell and Co²⁺ metal ion is reduced in the Co/Zr cell

<h3>What is a voltaic cell?</h3>

A voltaic cell is a cell that generates electricity by a spontaneous redox reaction.

It is an electrochemical cell, also known as a galvanic cell and

Electrical energy is created by converting chemical energy.

Examples of voltaic cells include the dry cell, nickel-cadmium cell, lead storage cell, and fuel cells.

The half-cell reactions for each cell are given by

$Au^{3+}(aq) + 3e^- \rightarrow Au(s)$ ; E° = 1.50 V

$Cr^{3+}(aq) + 3e^- \rightarrow Cr(s)$ ; E° = –0.74 V

$Co^{2+}(aq) + 2e^- \rightarrow Co(s)$ ; E° = –0.28 V

$Zn^{2+}(aq) + 2e^- \rightarrow Zn(s)$ E° = –0.76 V

Thus, Au³⁺ is reduced in the Au/Cr cell and Co²⁺ is reduced in the Co/Zr cell

Learn more about Voltaic cell:

brainly.com/question/24002834

#SPJ4

4 0

1 year ago