What is the name of the group that contains elements that are difficult to extract from nature?

5. What is the pH of an aqueous solution of the strong acid, Perchloric Acid (HClO4), with a concentration of 0.007 M?

bogdanovich [222]

Answer:

The pH is approximately: 2.1549

Explanation:

pH = - log(0.007)

8 0

2 years ago

Can someone help me please

Nostrana [21]

The answer is a as it is balanced and has the shown molecules

6 0

2 years ago

In the reaction Pb + 2Ag+ – Pb2+ + 2Ag, the Ag+ is.

Travka [436]

<h2><u>Question :-</u></h2>

In the reaction Pb + 2Ag+ – Pb2+ + 2Ag, the Ag+ is.

a) Reduced, and the oxidation number changes from +1 to 0.

b) Reduces and the oxidation number changes from +2 to 0.

c) Oxidized and the oxidation number changes from 0 to +1.

d) Oxidized, and the oxidation number changes from +1 to 0.

<h2><u>Solution :-</u></h2>

<h3><u>Given Information :-</u></h3>

<u>Reaction ➢</u> Pb + 2Ag⁺ ⟶ Pb²⁺ + 2Ag

Whether Ag⁺ is:-

a) Reduced, and the oxidation number changes from +1 to 0.

b) Reduces and the oxidation number changes from +2 to 0.

c) Oxidized and the oxidation number changes from 0 to +1.

d) Oxidized, and the oxidation number changes from +1 to 0.

<h3><u>Answer :-</u></h3>

Firstly let us know the meaning of Oxidation & Reduction and Oxidizing & Reducing Agent :-

Oxidation is process of loss of electron(s). Either atom or ion undergoing oxidation, is known as reducing agent.
Reduction is process of gain of electron(s). Either atom or ion undergoing reduction, is known as oxidizing agent.

In this reaction, Ag⁺ gains an electron to get <u>reduced</u> to Ag. The oxidation number changes from +1 to 0. Therefore, Ag+ is an oxidizing agent.

Since, this possibility is given in option a). Reduced, and the oxidation number changes from +1 to 0. Hence, option a is the correct answer.

<h2><u>Final Answer :-</u></h2>

Option a. Reduced, and the oxidation number changes from +1 to 0 is correct answer.

5 0

2 years ago

At what temperature will 41.6 grams N, exert a pressure of 815 mmHg in a

ratelena [41]

None of the given options are correct, and the correct answer is 174 K.

<u>Explanation:</u>

Mass of N = 41.6 g

Moles = $$\frac{given mass}{molar mass}$

= $$\frac{41.6 g}{28 g/ mol}$ = 1.5 moles

Pressure, P = 815 mm Hg = 1.07 atm

Volume, V = 20 L

R = gas constant = 0.08205 L atm mol⁻¹ K⁻¹

Temperature, T = ? K

We have to use the ideal gas equation,

PV = nRT

by rearranging the equation, so that the equation becomes,

T = $$\frac{PV}{nR}$

Plugin the above values, we will get,

T = $$\frac{1.07 \times 20}{1.5 \times 0.08205}$

= 174 K

So the temperature of the nitrogen gas is 174 K.

8 0

2 years ago

Are all acids colourless?

ra1l [238]

Answer:

Explanation:

No, there are colored acids, too. For example, the colorful indicators you use in acid/base titrations are all weak acids. Very strong acids tend to be colorless, simply because they are mostly small molecules (HCl, HNO3, H2SO4. etc.)

3 0

2 years ago

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