Calculate the wavelength of light produced if an electron moves from n=6 state to n=5 state of an electron in a hydrogen atom.

Answer:

Molecular mass, [tex]M=28.89\ \text{g/mol}[/tex]

Explanation:

Given that,

Mass of gas, m = 0.46 g

Volume of the container, V = 515 cm^3

Pressure, P = 153 kPa

Temperature, T = 322 K

We need to find the molecular mass of this gas. We know that,

PV =nRT

n = no of moles

[tex]n=\dfrac{PV}{RT}\\\\n=\dfrac{153\ kPa\times 0.515\ L}{8.31447\ LkPaK^{-1}{mol^{-1}}\times (322+273)\ K }\\\\n=0.01592\ \text{moles}[/tex]

No of moles = mass/molecular mass

Let molecular mass is M

[tex]M=\dfrac{m}{n}\\\\M=\dfrac{0.46}{0.01592}\\\\M=28.89\ \text{g/mol}[/tex]

So, the molecular mass of this gas is [tex]28.89\ \text{g/mol}[/tex]

Answer and Explanation:

Because metallic bonding involves delocalized electrons. It is described as a "sea of electrons", because the electrons are not confined around the nucleus of metal atoms, but they are delocalized: thay can be located in one nucleus and then in another neighbor atom. Thus, the electrons have more freedom to move from one part of the metal to another and electricity is well conducted.

Answer:

ΔG < 0

Explanation:

The condition for spontaneity of a chemical reaction is that ∆G<0. Hence for any biochemical reaction to proceed as written, ∆G must have a negative value.

If ∆G >0, the reaction is not spontaneous and will not proceed as written. ∆G=0 means that the reaction has attained equilibrium.

Answer:

adding a hydroxyl group

adding a carboxyl group

Explanation:

The addition of a hydroxyl or a carboxyl group to the molecule will increase its solubility. This is because, the -OH group will form hydrogen bonds with the water molecules. The formation of such hydrogen bonds will lead to improvement in the solubility of the anti cancer agent and solve the problem of poor solubility of the anticancer agent in water.

Answer:

Explanation:

Resonance structure occurs in an organic compound that undergoes resonance effects. This resonance effect is sometimes called the mesomeric effect helps to increases the stability of organic compounds that have alternating single bonds and double bonds.

The second resonance structure diagram for the ion given in the question can be found in the attached diagram below.

Answer: Auroras

Explanation:

Hope this helps

Answer:

Option Auroras is correct

Explanation:

I got it right.

Answer: Convection

Explanation: Convection is the transfer of heat energy in a fluid. This type of heating is most commonly seen in the kitchen with a boiling liquid. Air in the atmosphere acts as a fluid.

Answer:

1. 1.100x10⁴mg

2. 2444mg

Explanation:

1. The 18.00g milk chocolate bar contain 11.00g of sugar. In miligrams:

11.00g * (1000mg / 1g) = 1.100x10⁴mg

2. If a bar of 18.00g contain 11.00g of sugar, a bar of 4.000g will contain:}

4.000g bar * (11.00g / 18.00g)  = 2.444g of sugar.

In miligrams:

2.444g * (1000mg / 1g) = 2444mg

Explanation:

Arsenic.................

The electron configuration 1s22s22p63s23p64s23d104p3 represents Arsenic.

The electronic configuration is represented as follows;

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p³.

Count the number of electrons to know the element. The number of electron in an electronically neutral atom is equal to the number of proton.

The number of proton is the atomic number of the element. Therefore,

2 + 2 + 6 + 2 + 6 + 2 + 10 + 3 = 33

The atomic number is 33. The element with atomic number of 33 is Arsenic. Therefore, the element is Arsenic.

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Answer:

THE TEMPERATURE AT THE EXTERNAL PRESSURE OF 490 TORR IS 550.72 C

Explanation:

Heat of vaporization = 30.72 kj/mol

Normal boiling point = 80.1 C

Pressure = 490 torr

So therefore, with the above variables given, the relationship between heat of vaporization, pressure and temperature is given by this equation:

ln (P2/P1) = - ^H vap/ R ( 1/ T2 - 1/T1)

H vap = 30.72 kj/mol

P1 = 760 torr ( this is so because the normal boiling point occurs at the vapor pressure equal to the atmospheric pressure which value is 760 torr)

T1 = 80.1 + 273 = 353.1 K

P2 = 490 torr

R = 8.314 J/mol K

T2 = unknown

Re-arranging the formula bu=y making T2 the subject of the equation, we have;

T2 = 1 / (1/T1) - (R / Hvap) (ln (P2/P1))

Introducing the variables into the equation, we have:

T2 = 1 / (1 / 353.1 ) - (8.341 / 30.72 * 10 ^3) ln (490 / 760)

T2 = 1/ (0.00283 - 0.27* 10^-3 ln 0.6447)

T2 = 1 / 0.00283 - 0.27*10^-3 (- 0.43897)

T2 = 1 / 0.00283 + 0.1185 * 10 ^-3

T2 = 1 / 0.1214 *10^-3

T2 = 1 / 0.001214

T2 = 823.72

T2 = 823.72 - 273 = 550.72 C

The temperature when the external pressure is 490 torr is 550.72 C

Answer:

Mixture.

Explanation:

Hello,

In this case, when blending we are continuously sliding the substances until we obtain small particles that when do not chemically but physically combine we say they are forming a mixture. Nevertheless, when they chemically combine they form a chemical compound due to the formation of bonds between them.

Regards.

Answer:

6.0 × 10² mL

Explanation:

Step 1: Given data

A recipe for spaghetti sauce requires 2.5 cups of tomato sauce.

Step 2: Calculate the US Quarts (qt) corresponding to 2.5 cups of tomato sauce

We will use the relationship 1 qt = 4 cups.

2.5 cups × (1 qt/4 cups) = 0.63 qt

Step 3: Calculate the milliliters (mL) corresponding to 0.63 qt of tomato sauce

We will use the relationship 1 qt = 946 mL.

0.63 qt × (946 mL / 1 qt) = 6.0 × 10² mL

Answer:

A. relative humidity B. air temperature C. air pressure D. atmospheric

Explanation:

just completed the assignment

Answer:

Basically reconfirming what the other guy said

Explanation:

Relative humidity

Air temperature

Air pressure
Atmostpheric

Yall have a nice day.

Answer:

C

Explanation:

'Ordered Arrangement' basically means that it is a solid at room temperature. Room temperature is approximately 15-20C so we are looking for melting and boiling points that are above room temperature so it hasn't/can't melt or boil at room temperature and would therefore be solid. Option C is the only one where both points are temperatures above room temperature therefore option C is the only one where the substance would be in an 'ordered arrangement' at room temperature.

Hope this helped!

Answer:

childhood trauma.

Explanation:

I took the test and the answer i got correct was Childhood trauma.

Answer:

1 0.005Km

2 3000mg

3 700 cm

5. 2500mm

6 0.0045

Explanation:

Explanation:

steps of the technological design process include: identify a problem, research the problem, generate possible solutions, select the best solution, create a model, test the model, refine and retest the model as needed, and communicate the final solution.

Answer:

A) 2.8 atm

Explanation:

Answer:

Limitation of comparative investigation is that when it is done on a huge population, huge amount cost is required. Explanation: Benefit of comparative investigation is that we can get descrete information about specific breed or species. It is important for the study of behaviour of many organisms.

Explanation:

Answer:

9.96x10⁻⁹ moles of ions are in a cubic kilometer

Explanation:

As the problem states, in the near-earth space there are 6x10¹⁵ ions.

Moles are an amount of substance defined as 6.022x10²³. 1 mole of ions are 6.022x10²³ ions

1 mole of substance is 6.022x10²³ particles.

As there are 6x10¹⁵ ions in a cubic kilometer, the moles are:

6x10¹⁵ ions * (1mol / 6.022x10²³ ions) =

Based on the formula for calculating moles of particles, there are 9.96 * 10⁻⁹ moles of ions in a cubic kilometer of  interplanetary space.

The moles of ions is determined using the formula below:

Data provided:

Number of ions = 6 * 10¹⁵ ions

Moles of ions =  6 * 10¹⁵ ions/6.02 * 10²³

moles of ions = 9.96 * 10⁻⁹ moles of ions.

Therefore, there are 9.96 * 10⁻⁹ moles of ions in a cubic kilometer of  interplanetary space.

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Answer:

A.326

Explanation:

B is incorrect because that would be 4 significant figures.

C is incorrect because that would be 5 significant figures.

D is incorrect because, while it is 3 significant figures, it is rounding the .6 down which doesn't make sense. since it's .6 you should be rounding up not down.

Answer:

silicon

Explanation:

Answer:

you are caculating for the mass/wight of ethanol

Explanation:

DxV=M

Answer:

a. 5

b. 4

c. 3

d. 2

Explanation:

How many constitutionally isomeric monochlorination products are possible from the following?

a. 2-Methylpentane

In 2-methylpentane, there are five possible monochlorinated substitutional products in the reaction of chlorination of 2-methylpentane in the presence of sunlight.

b. In 3-methylpentane there are four possible monochlorinated substitutional products in the reaction of chlorination of 3-methylpentane in the presence of sunlight.

c. In 2,2-Dimethylbutane there are three possible monochlorinated substitutional products in the reaction of chlorination of 2,2-Dimethylbutane in the presence of sunlight.

d. In 2,3-Dimethylbutane there are two possible monochlorinated substitutional products in the reaction of chlorination of 2,3-Dimethylbutane  in the presence of sunlight.

Answer:

Hexane > pentane > neopentane

Explanation:

The boiling point of alkanes varies with chain length. The greater the length of the chain, the greater its boiling point.

Since hexane consists of a longer chain than pentene, its boiling point is definitely higher than that of pentane.

Similarly, neopentane is a branched alkane, the boiling point of a branched alkane is always lower than that of its straight chain counterparts.

Hexane has the highest boiling point due to its higher molecular weight, followed by pentane, and neopentane has the lowest boiling point due to its highly branched structure.

The boiling point is primarily influenced by two factors: molecular weight and branching. The higher the molecular weight, the stronger the van der Waals forces and, therefore, the higher the boiling point. Branching in a molecule tends to disrupt the intermolecular forces, reducing the boiling point.

Hexane has a higher molecular weight than pentane, so it would generally have a higher boiling point than pentane.

Neopentane is highly branched, with four methyl (CH3) groups attached to the central carbon. This branching significantly disrupts the intermolecular forces, reducing the boiling point compared to straight-chain molecules like pentane and hexane.

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Answer:

Solids.

Explanation:

Group 8 on the Periodic Table consists of transition metals:

- Fe (Iron)

- Ru (Ruthenium)

- Os (Osmium)

- Hs (Hassium)

Usually, transition metals are solids.