Select the sentence that best describes why copper and some other metals are good conductors.Answer

Copper atoms have loosely held electrons; this means they can freely move in and out of the nucleus of the atom.

Copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.

Copper and some other metals have highly active inner shells. This means that electrons can be freely exchanged between shells.

Copper has a small number of electrons; this means it can easily shed these electrons and take electrons from other atoms.
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Answers

Answer 1

Answer: The correct answer for this question would be the second option. The statement that t describes why copper and some other metals are good conductors is that copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms. Hope this answer helps.

Answer 2

Answer:

Answer: Option (b) is the correct answer.

Explanation:

Electronic configuration of copper is $[Ar]4s1 3d^(10)$ and copper is known as the best conductor of heat and electricity.

This is because in copper there is availability of free electrons in its valence shell (outermost shell).

And, as it is known that electricity is the flow of electrons. This means that since copper metal contains a number of free electrons. Hence, it can easily conduct electricity.

Thus, we can conclude that copper and some other metals are good conductors because copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.

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Which one of the following statements is correct?A. An electron has a negative electrical charge.
B. An electron has a neutral electrical charge.
C. An electron is much larger than an atom.
D. An electron is located inside the nucleus of an atom.

Answers

Answer: Option (A) is the correct answer.

Explanation:

An atom consists of three sub atomic particles. These particles are protons, electrons and neutrons.

Protons have a positive charge. Whereas neutrons have no charge. On the other hand, electrons have a negative charge.

Thus, we can conclude that out of the given options, an electron has a negative electrical charge is the correct statement.

Which calculation set-up would be correct to determine the volume of concentrated hydrochloric acid (12.0 M HCl) that is required to make 500.0 milliliters of a 6.0 M HCl?

Answers

Answer : The volume of concentrated hydrochloric acid is, 0.25 liters

Explanation :

Using neutralization law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of concentrated hydrochloric acid = 12 M = 12 mole/L

$M_2$ = molarity of hydrochloric acid = 6 M = 6 mole/L

$V_1$ = volume of concentrated hydrochloric acid = ?

$V_2$ = volume of hydrochloric acid = 500 ml = 0.5 L

Now put all the given values in the above formula, we get the volume of concentrated hydrochloric acid.

$12mole/L* V_2=6mole/L* 0.5L$

$V_2=0.25L$

Therefore, the volume of concentrated hydrochloric acid is, 0.25 liters

M₁ *V₁ = M₂ * V₂

12.0 * V₁ = 6.0 * 500.0

12.0 V₁ = 3000

V₁ = 3000 / 12.0

V₁ = 250 mL

hope this helps!

what is the significance of the number that is written above each of the atomic symbol in the periodic table?

Answers

It is the atomic number of the element, which is the number of protons in the nucleus of an atom that determines the chemical properties of an element.

The fermentation of C6H12O6 will produce CO2 and 1. C3H5(OH)3 2. C2H5OH 3. Ca(OH)2 4. Cr(OH)3

Answers

Answer is "2 - C₂H₅OH".

Fermentation is a process which is used to produce energy from sugars (glucose, sucrose and fructose) in the absence of oxygen.

Fermentation with the glucose releases energy by producing carbon dioxide (CO₂) and ethanol (C₂H₅OH) as its byproducts.
The reaction is
C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + energy

Which type of reaction occurs when nonmetal atoms become negative nonmetal ions?A. oxidation
B. reduction
C. substitution
D. condensation

Answers

Answer: Option (B) is the correct answer.

Explanation:

When an atom gains electrons then it becomes rich in electrons and therefore it acquires a negative charge.

Also, it is known that a reduction reaction is a reaction in which an element gain electron(s).

For example, $Br_(2) + 2e^(-) \rightarrow 2Br^(-)$ is a reduction reaction.

Thus, we can conclude that when nonmetal atoms become negative nonmetal ions then type of reaction which occurs is reduction reaction.

The answer is B. reduction. The atom becoming negative ions means it gains electrons. The reaction which gain electrons is reduction reaction. So the answer is B.

What are the three factors that speed up solvation also called mixing and dissolving?

Answers

1. Temperature
2. Agitation ( Stirring )
3. Increasing the Surface area

however, 1 and 2 act opposite in gases while 3 doesn't affect gases.

The only thing that affect gases is
4. pressure

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