CHEMISTRY HIGH SCHOOL

17. What standard reduction electrode has a half-cell potential of 0.00 V? Oxygen hydrogen
lithium
Fluorine

Answers

Answer 1
Answer: I believe Hydrogen is the standard reduction electrode that has a half-cell potential of 0.00 V. In electrochemical cell, an electric potential is created between two dissimilar metals. This potential is a measure of the energy per unit charge which is available from reduction or oxidation reactions to drive the reaction. 

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Bromine, a liquid at room temperature, has a boiling point of 58°C and a melting point of –7.2°C. Bromine can be classified as acompound.
impure substance.
mixture.
pure substance.

Answers

Answer:

D. pure substance.

Explanation:

Answer:

:D

Explanation:

Name a substance in the air which makes the surface of limestone change

Answers

The substance in the air that makes the surface of limestone change is sulfur dioxide (SO2).

What are limestone?

Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in the form of the mineral calcite. It can form in a variety of ways, but most commonly it is formed from the accumulation of the remains of marine organisms such as coral, shells, and other calcium-rich materials.

Limestone is a common building material and is used in construction, as a flux in the production of iron and steel, and in agriculture as a soil conditioner. It is also used in the chemical industry to produce lime, carbon dioxide, and other chemicals. Limestone can be found in many parts of the world and is usually formed in shallow, warm marine environments.

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A substance in the air which can change the surface of limestone would be oxygen, O2.

As this reaction takes place at higher temperatures, it is observed that the equilibrium shifts toward the products. The reaction is

Answers

As this reaction takes place at higher temperatures, it is observed that the equilibrium shifts toward the products. The reaction is an endothermic reaction since it requires energy for the reaction to proceed which describes an endothermic reaction.

The answer is: endothermic reaction.

This reaction is endothermic (enthalpy is higher than zero), which means that heat is added.  

According to Le Chatelier's principle when the reaction is endothermic heat is included as a reactant and when the temperature increased, the heat of the system increase, so the system consume some of that heat by shifting the equilibrium to the right, producing more products.

A person pushes horizontally with a force of 220. N on a 56.0 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.21. (a) What is the magnitude of the frictional force? (b) What is the magnitude of the crate's acceleration?

Answers

Explanation:

(a)   As it is given that there is no vertical displacement. Hence, the forces on y-axis are equal and opposite.

Also, it is known that F = mg

So,            F = 56 kg * 9.8 m/s^(2)

                    = 548.8 N

Also,   F_(f) = \mu N

where,   \mu = coefficient of kinetic friction

                 N = force calculated

Putting the values into the formula as follows.

            F_(f) = \mu N

                       = 0.21 * 548.8

                      = 115.25 N

Hence, the magnitude of the frictional force is 115.25 N.

(b)   Now, let us assume that the acceleration is towards the positive x-direction.

                F - F_(f) = ma

        548.8 N - 115.25 = 56 * a

                  a = 7.74 m/s^(2)

Therefore, the magnitude of the crate's acceleration is 7.74 m/s^(2).

Which type of reaction occurs in the following? 2HgO(s) 2Hg(l) + O2(g)A.a decomposition reaction in which a metal is reduced
B.an acid-base neutralization reaction to produce oxygen gas
C.a displacement reaction involving two metals
D.a combustion reaction involving burning a metal in oxygen

Answers

In this reaction, reactant HgO decomposed into more than one products and reaction is called decomposition. Hg in HgO has oxidation number of +2 whereas oxidation number of Hg in product side is zero( zero because Hg is in its elemental form) so Hg is reduced. Hence option A is correct.

what is decomposition ?

Decomposition can be defined as the  “to break down” of complex substance or organic matter into a simpler inorganic matter.

It is one of the essential processes of the ecosystem, decomposition is a metabolic process which take up raw materials in the form of complex compounds, processing it and then converting it into simpler compounds.

some of the Bacteria, fungi and a few other microorganisms are involve in the process of decomposition as feed on dead organisms to survive.

in this process decaying and dead animals and plants serve as the raw materials undergo breakdown process and produces nutrients, carbon dioxide, and water;  Microbes  which involve in this process collectively known as saprophytes.

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In this reaction, reactant HgO decomposes into more than one products hence reaction is called decomposition.Hg in HgO has oxidation number of +2 whereas oxidation number of Hg in product side is zero( zero because Hg is in its elemental form) so Hg is reduced. Hence A is correct option. 

What is the molar mass N
what is the molar mass U

Answers

The molar mass for N is 14.007 g/mol

The molar mass for U is 238.03g/mol

The molar mass is the same as mass number if it is only one element with no subscripts.

If it was H2O then it would be 18.016g/mol
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