CHEMISTRY HIGH SCHOOL

When an electron is displaced in a semiconductor, the hole that's left behind isA. attracted to the negative terminal of the voltage source.
B. attracted to the anode of the voltage source.
C. considered an impurity in the crystal.
D. incapable of carrying a charge.

(D. is wrong)

Answers

Answer 1
Answer: answer is A : attracted to the negative terminal of the voltage source
 I think, that the "hole"moves as it captures a free electron leaving another hole in a slightly different place. The electron leaving leaves a net + charge, which is attracted to the negative terminal. Because the "hole" behaves as a positive charge it is attracted towards the negative terminal.
Answer 2
Answer:

Answer:

A. attracted to the negative terminal of the voltage source.

Explanation:

bc that is what the hole that's left behind does

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What is the pressure in atm exerted by 2.48 moles of a gas in a 250.0 ml container at 58c?

Answers

Explanation:

The given data is as follows.

     V = 250.0 ml,                  T = 58^{o}C = 58 + 273 = 331 K

      n = 2.48 moles,              P = ?    ,             R = 0.082 atm L /K mol

Therefore, calculate the pressure using ideal gas equation as follows.

                       PV = nRT

                        P = (nRT)/(V)

                            = (2.48 mol * 0.082 atm L/K mol * 331 K)/(250.0 ml)

                            = 0.269 atm

Thus, we can conclude that pressure of the given gas is 0.269 atm.
T = 58 + 273.15 = 331.15

R = 0.082 atm

V = 250.0 mL / 1000 = 0.25 L

P =  n x R x T / V

P = 2.48 x 0.082 x 331.15 / 0.25

P = 67.342 / 0.25

P = 269.368 atm

hope this helps!

A solid is cooled to a very low temperature assuming the mass remains constant how if at all does this affect the density of the solid?

Answers

Temperature is related to the kinetic energy the atoms within any givensubstance. Within a solid, we can therefore assume that the density willincrease as the solid is cooled to a low temperature, as this willcause a loss in kinetic energy and the atoms won't be able to move asfreely.

Which elements have the most similar chemical properties? boron and carbon oxygen and sulfur aluminum and bromine argon and silicon

Answers

Answer: Option (b) is the correct answer.

Explanation:

Elements which belong to same group show similar chemical properties.

This is because elements which are present in the same group have same number of valence electrons. Hence, they tend to show same type of reactivity which makes them exhibit similar chemical properties.

As chemical properties are defined as the properties which tend to show difference in chemical composition of a substance.

For example, toxicity, reactivity, combustion etc are all chemical properties.

Here, oxygen and sulfur are both group 16 elements. So, they tend to show similar chemical properties.

Thus, we can conclude that oxygen and sulfur elements have the most similar chemical properties.

Final answer:

Among the given pairs, oxygen and sulfur display the most similar chemical properties because they are in the same group of the periodic table (Group 16, or the chalcogens), and thus have the same number of valence electrons (six), leading to similar chemical reactivity.

Explanation:

Among the pairs of elements presented in the original question (boron and carbon, oxygen and sulfur, aluminum and bromine, argon, and silicon), the pair that has the most similar chemical properties is oxygen and sulfur. This is due to their placement within the same group on the periodic table, specifically the chalcogens, or Group 16.

Elements in the same group of the periodic table typically exhibit similar chemical properties because they have the same number of valence electrons. For example, boron and carbon, although neighbors on the periodic table, do not exhibit highly similar chemical properties due to their different numbers of valence electrons.

On the other hand, oxygen and sulfur, both being members of Group 16, have six valence electrons and thus exhibit similar chemical reactivity and form similar types of compounds, despite their differences in physical properties.

Learn more about Similarity in Chemical Properties here:

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Can i get help with this dont really get it​

Answers

Answer:

Number 2 is Direction

Explanation:

The old answer for number four was incorrect

I apologize for the inconvenience but I do not have an answer that fits in the lines for number 4

1. The speed limit on most city streets is (25 miles). How many meters per minutehour
is this?
This is a conversion.

Answers

Answer:

Speed = 670.56 (m)/(min)

Explanation:

Given

Speed = (25 mi)/(hr)

Required

Convert to meters per minutes

Speed = (25 mi)/(hr)

Start by converting the speed from miles to meters

1\ mile = 1609.34\ meters.

So, we have:

Speed = (25 * 1609.34\ m)/(hr)

Speed = (40233.5\ m)/(hr)

Next, we convert time from hours to minutes

1\ hour = 60\ minutes

So, we have:

Speed = (40233.5\ m)/(60\ min)

Speed = 670.56 (m)/(min)

Hence, the equivalent of 25 miles per hour is 670.56 meters per minutes

Which pair below describes isotopes of the same element? A) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons B) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons C) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons D) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons

Answers

Answer: The atom with 6 protons and 6 neutrons and an atom with 6 protons and 7 neutrons are the isotopes of same element.

Explanation:

Isotopes are defined as the chemical species that belong to the same element but differ in their mass number.

This also means that the chemical species have same number of protons and electrons but different number of neutrons.

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

From the given options:

The elements having same number of protons will be the isotopes of same element.

Hence, the atom with 6 protons and 6 neutrons and an atom with 6 protons and 7 neutrons are the isotopes of same element.
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