23 Which term identifies the half-reaction that occurs at the anode of an operating electrochemical cell?(1) oxidation (3) neutralization
(2) reduction (4) transmutation

Answers

Answer 1

Answer:

Answer: The correct answer is Option 1.

Explanation:

Electrochemical cell is defined as the device that is used for the conversion of the chemical energy produced in a redox reaction into the electrical energy. In this cell, oxidation reaction occurs at anode and reduction reaction occurs at cathode.

For the given options:

Option 1: Oxidation reaction

Oxidation reaction is defined as the chemical reaction where a substance looses its electrons. The oxidation state of this substance gets increased and the substance gets oxidized.

$X\rightarrow X^(n+)+ne^-$

Option 2: Reduction reaction

Reduction reaction is defined as the chemical reaction where a substance gains electrons. The oxidation state of this substance gets reduced and the substance gets reduced.

$X^(n+)+ne^-\rightarrow X$

Option 3: Neutralization reaction

Neutralization reaction is defined as the chemical reaction where an acid reacts with a base to produce a salt and water molecule.

$HX+BOH\rightarrow BX+H_2O$

Option 4: Transmutation

This is defined as the process in which a nucleus is converted to another nucleus.

From the above information, at anode, oxidation reaction occurs. Thus, the correct answer is option 1.

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10. A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (Assume that there''s no change in volume.)A. 1.702 kPa
B. 3.636 kPa
C. 854.46 kPa
D. 510 kPa

Answers

Answer : (C) 854.46 KPa.

Solution : Given,

Initial pressure = 400 KPa

Initial temperature = 110 K

Final temperature = 235 K

According to the Gay-Lussac's law, the absolute pressure is directly proportional to the absolute temperature at constant volume of an ideal gas.

P ∝ T

Formula used :

$(P_(1))/(P_(2))=(T_(1))/(T_(2))$

where,

$P_(1)$ = initial pressure

$P_(2)$ = final pressure

$T_(1)$ = initial temperature

$T_(2)$ = final temperature

Now put all the values in above formula, we get

$(400)/(P_(2))=(110)/(235)$

By rearranging the terms, we get the value of new/final pressure.

$P_(2)$ = 854.5454 KPa $\approx$ 854.55 KPa

Given that N and V are constants:

$P=(NRT)/(V)\n(400)=(8.31)(110)(N)/(V)\n400=914.59(N)/(V)\n(400)/(914.59)=(N)/(V)\n\nP=(8.31)(235)(N)/(V)\nP=(1953.90)(400)/(914.59)\nP=854.55\n854.55=about~854.46$

C. 854.46 kPa

What is a chemical solution and what are the names of its components?

Answers

Answer:

A chemical solution is defined as a homogeneous mixture of two or more substances. There are two components of chemical solution that include solute and solvent.

Solute is the component that get dissolved in another substance and solvent is the substance that dissolve solute.

For example: carbon dioxide in water. Where carbon-dioxide is solute and water is solvent.

Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will conduct an electric current. When an electrolyte forms into a solution, it dissolves or dissociates into ions, a process called ionization. If a substance does not ionize, it will not conduct an electric current. Electrolytes include most acids, bases, and salts. Some conductors include hydrogen and sodium chloride, copper sulfate, and potassium nitrate. Substances that are not electrolytes include distilled water, sugar water, and most organic compounds. Which of the following is a non-electrolyte?
A) H 2 SO 4 (sulfuric acid)B) HCL (hydrochloric acid)C) C 3 H 8 (propane gas)D) NaCl (table salt)

Answers

answer: C
because propane gas is organic compound

$This is the answer C because propane gas is the only which is a \n non-electrolyte. It's because propane gas is organic compound.$

The density of an elemental gas is 1.7824 g/l at stp. what is the molar mass of the element. what is the element?

Answers

Answer: The molar mass of the element is 40 g/mol and element is Calcium.

Explanation:

At STP:

1 mole of a gas contains 22.4 L of volume

Molar mass is defined as the mass of 1 mole of a substance.

To calculate mass of of the substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Volume of gas = 22.4 L

Density of gas = 1.7824 g/L

Putting values in above equation, we get:

$1.7824g/L=\frac{\text{Mass of gas}}{22.4L}\n\n\text{Mass of gas}=(1.7824g/L* 22.4L)=39.9g\approx 40g$

The element having molar mass 40 g is Calcium.

Hence, the molar mass of the element is 40 g/mol and element is Calcium.

At STP 1 mole of gas occupies 22.4L. So you just multiply 1.7824g/L by 22.4L and the Liters cancel out. So the final answer is 39.92 and element Argon is closest to this mass so Argon is the element.

common state of matter on earth for tin ,scientist related to tin and color,texture,hardness,smell of tin please help really important please i will be very thank full please

Answers

Tin (Sn), also known as stannum, is a silvery-white to grey solid metal. It is considered to have a smooth texture and a hardness of 1.5 on the Mohr's scale which is very soft. It is also odorless and inert which is why it is used in many packaging. Robert Boyle did studies on the oxidation of tin in the 1600s.

Which of the following is an example of a mixture? Option 1: Pure water Option 2: The air in your room Option 3: Gold Option 4: All of the above

Answers

Answer:

Explanation:

Pure water is not a mixture....it is only water

gold ...is only gold

2. air IS a mixture of various gases.....nitrogen , oxygen, co2 etc

Final answer:

Option 2: The air in your room. The air in your room is an example of a mixture because it consists of various gases that can be separated from each other.

Explanation:

The correct answer is Option 2: The air in your room.

A mixture is a combination of two or more substances that are not chemically bonded together. The air in your room is a mixture because it consists of various gases such as oxygen, nitrogen, carbon dioxide, and others. Each gas retains its individual properties and can be separated from the others.

On the other hand, pure water is a compound because it consists of two hydrogen atoms bonded to an oxygen atom, while gold is an element because it is composed of only gold atoms.