Which one of the following will have the higher boiling point: 1-pentanol or hexane? (BLB Ch. 11)

Answers

Answer 1

Answer:

Answer:

1-pentanol

Explanation:

Hexane is non-polar in nature. This is due to :

The bond in the molecule is C-H, which is non-polar in nature because the carbon and the hydrogen having very similar electronegativity values.

Hexane is also symmetric.

The intermolecular force acting in the molecule of the hexane are induced the dipole-dipole forces or London Dispersion forces / van der Waals forces which is a very weak force.

On the other hand, in the case of 1-pentanol, hydrogen bonding exist which is a strong intermolecular force.

Hence, more amount of thermal energy is required to boil 1-pentanol. hence, it has more boiling point.

Answer 2

Answer:

Final answer:

The boiling point of 1-Pentanol is higher than hexane because it has stronger intermolecular forces caused by hydrogen bonding. Hexane, on the other hand, has weaker van der Waals forces.

Explanation:

The boiling point of a substance is determined by its intermolecular forces. 1-pentanol has a higher boiling point than hexane because of the presence of hydrogen bonding in 1-pentanol, which is a stronger intermolecular force than the van der Waals forces present in hexane. Hence, more energy is required to break the intermolecular forces in 1-pentanol making its boiling point higher.

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Which of the following electron configurations represents an excited state of the indicated atom? Group of answer choices a.Na: 1s2 2s2 2p6 3s2 3p2 3s1
b.Ne: 1s2 2s2 2p6
c.N: 1s2 2s2 2p3
d.P: 1s2 2s2 2p6 3s2 3p2 4s1
e.He: 1s2

Answers

Answer: The electronic configuration of the atom that represents excited state is P: $1s^22s^22p^63s^23p^24s^1$

Explanation:

There are 2 states classified under energy levels:

Ground state: This is the lower energy state which is termed as stable state.
Excited state: This is the upper energy state and is termed as the unstable state. All the electrons which are present in this state always come back to the ground state.

For the given options:

For a: Sodium

The atomic number of sodium element is 11. The ground state electronic configuration of this element is $1s^22s^22p^63s^1$

For b: Neon

The atomic number of neon element is 10. The ground state electronic configuration of this element is $1s^22s^22p^6$

For c: Nitrogen

The atomic number of nitrogen element is 7. The ground state electronic configuration of this element is $1s^22s^22p^3$

For d: Phosphorus

The atomic number of phosphorus element is 15. The ground state electronic configuration of this element is $1s^22s^22p^63s^23p^3$

One electron from the valence shell jumps into outer shell and the excited state electronic configuration becomes $1s^22s^22p^63s^23p^24s^1$

For e: Helium

The atomic number of helium element is 2. The ground state electronic configuration of this element is $1s^2$

Hence, the electronic configuration of the atom that represents excited state is P: $1s^22s^22p^63s^23p^24s^1$

Final answer:

The sodium atom with the electron configuration 1s2 2s2 2p6 3s2 3p2 3s1 is in an excited state because other sodium atom stages are not completely filled.

Explanation:

An atom is in an excited state when one or more electrons have moved to a higher energy level. Normal electron configurations have the electrons in the lowest possible energy states (or orbitals). In this case, the answer choice is (a) sodium (Na) with the electron configuration 1s2 2s2 2p6 3s2 3p2 3s1. Sodium normally has the 3s state fully occupied, so the presence of an electron in a higher energy state (3p) and the vacancy in the lower energy state (3s) indicates an excited state.

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Please match word and definition < electrons and electric current move easily 1. electric current < Prevents electrons from moving 2. insulator flow of an electrical charge in a circuit 3. electric circuit 4. conductor provides a path for electrons to flow

Answers

Due to property of conduction, conductor allows electrons and electric current to move easily,insulators prevent electric current from moving, electric current is the flow of an electrical charge in a circuit and electric circuit provides a path for electrons to flow.

What is conduction?

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

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Answer:

1st box:4

2nd box:2

3rd box:3

4th box:1

Explanation:

I am not 100% sure on this, but i am pretty confident that this is the answer! BUT If this is somehow wrong, please tell me so i can comment a better answer! :)

Calculate the energies of one photon of ultraviolet (λ = 1 x 10⁻⁸ m), visible (λ = 5 x 10⁻⁷ m), and infrared (λ = 1 x 10⁴ m) light. What do the answers indicate about the relationship between the wavelength and energy of light?

Answers

Answer:

Energy of ultraviolet light is 19.878 10⁻¹⁸ J

Energy of visible light is 3.9756 X 10⁻¹⁹ J

Energy of infrared light is 19.878 X 10⁻³⁰ J

The answers indicate that wavelength is inversely proportional to the energy of light (photon)

Explanation:

Energy of photon E = hc/λ

where;

h is Planck's constant = 6.626 X 10⁻³⁴js

c is the speed of light (photon) = 3 X 10⁸ m/s

λ is the wavelength of the photon

⇒For ultraviolet ray, with wavelength λ = 1 x 10⁻⁸ m

E = (6.626 X 10⁻³⁴ X 3 X 10⁸)/ (1 x 10⁻⁸)

E = 19.878 10⁻¹⁸ J

⇒For Visible light, with wavelength λ = 5 x 10⁻⁷ m

E = (6.626 X 10⁻³⁴ X 3 X 10⁸)/ (5 x 10⁻⁷)

E = 3.9756 X 10⁻¹⁹ J

⇒For Infrared, with wavelength λ = 1 x 10⁴ m

E = (6.626 X 10⁻³⁴ X 3 X 10⁸)/ (1 x 10⁴)

E = 19.878 X 10⁻³⁰ J

From the result above, ultraviolet ray has the shortest wavelength, but it has the highest energy among other lights.

Also infrared has the highest wavelength but the least energy among other lights.

Hence, wavelength is inversely proportional to the energy of light (photon).

The steps in a reaction mechanism are as follows. Which species is acting as a catalyst? Step 1: Ag+(aq) + Ce4+(aq) <-----> Ag2+(aq) + Ce3+(aq) Step 2: Tl+(aq) + Ag2+(aq) -----> Tl2+(aq) + Ag+(aq) Step 3: Tl2+(aq) + Ce4+(aq) -----> Tl3+(aq) + Ce3+(aq)

Answers

The specie which is acting as a catalyst is; Ag+(aq).

Discussion:

The catalyst is a specie that exists in the same form at the beginning and end of the reaction.

The reaction's mechanism is as follows;

Step 1: Ag+(aq) + Ce⁴+(aq) <-----> Ag²+(aq) + Ce³+(aq)

Step 2: Tl+(aq) + Ag²+(aq) -----> Tl²+(aq) + Ag+(aq)

Step 3: Tl²+(aq) + Ce⁴+(aq) -----> Tl³+(aq) + Ce³+(aq)

Evidently, although Ag+(aq) was converted to Ag²+(aq) in Step 1 of the reaction; the Ag²+(aq) is reverted back to Ag+(aq) in Step 2 of the reaction.

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Answer:

Ag⁺ acts as the catalyst.

Explanation:

Hello,

In this case, each step is reorganized:

- Step 1:

$Ag^+(aq) + Ce^(4+)(aq) \rightleftharpoons Ag^(2+)(aq) + Ce^(3+)(aq)$

- Step 2:

$Tl^+(aq) + Ag^(2+)(aq) \rightarrow Tl^(2+)(aq) + Ag^+(aq)$

- Step 3:

$Tl^(2+)(aq) + Ce^(4+)(aq) \longrightarrow Tl^(3+)(aq) + Ce^(3+)(aq)$

In such a way, Ag⁺ is converted to Ag²⁺ in the first step, but then it is regenerated to simple Ag⁺, therefore, Ag⁺ acts as the catalyst.

Best regards.

I need to find the answer for
_ ML = 8,000,000 L

Answers

Answer:

To find the value of the blank in the equation "_ ML = 8,000,000 L," you can simply fill in the blank with a number:

"_ ML = 8,000,000 L" can be filled in as "8,000 ML = 8,000,000 L."

So, the answer is 8,000 ML.

Culled from AI

Four different methods are described for validating the results of a particular analysis. Indicate for each whether the method primarily checks the accuracy of the analysis or the precision of the analysis.a. Five aliquots of the same sample are injected for gas chromatographic analysis by one person on the same day.
i. Accuracy
ii. Precision
b. A known amount of analyte is added to an aliquot of the sample and analyzed with sample.
i. Accuracy
ii. Precision
c. Aliquots from a blood sample are sent to three separate laboratories for analysis using the same method.
i. Accuracy
ii. Precision
d. Identical standard are analyzed by two different methods.
i. Accuracy
ii. Precision

Answers

Answer:

a) Precision

b) Accuracy

c) Accuracy and precision

d) Accuracy

Explanation:

When an experiment is done more than once to determine if the results are statistically ok, two forms of the validations are possible the accuracy and precision. When the values of the various experiments are close to the known value, then they are accurate. When the values are close to each other they are precise. So, sometimes the results are precise but are not accurate, and vice-versa.

a) Here, the person wants to find if the 5 aliquots will have close results, so, he or she is looking for precision.

b) Here the amount of analyte is already known, and the person wants to identify if the value will be the same when analyzed together with another sample, thus he or she is looking for accuracy.

c) Here the three results will be compared with each other (precision) and with the standard value of the method (accuracy).

d) The methods will be tested, and the values will be compared with the standard known value, so the person is looking for accuracy.

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A sample of solid calcium hdroxide, Ca(OH)2 is allowed to stand in water until a saturated solution is formed. A titration of 75.00mL of this solution with 5.00 x 10-2 M HCl 36.6 mL of the acid to reach the end pointCa(OH)2 + 2HCl ? CaCl + 2H2O What is the molarity?