Calculate the volume of 2.408x1024 molecules of water vapor at STP.

select the periodic table tab, and look at the second row, or period, of the table. how does this row reflect the subshells of t

nikklg [1K]

The second row of the periodic table reflects second energy level which corresponds to 2 subshells obtained in this row.

Periodic table is arranged in rows and columns, the columns represents the group of the elements and the rows represents the energy level of the elements.

When we observe the second row of the periodic table, we will notice the following;

The second row of the periodic table corresponds to second energy level.
The maximum number of shells is 2.
The number of electrons in the second subshell increases from left to right
The maximum number of electrons in the second subshell is 8, which is found in group zero (noble gases group).

Thus, we can conclude that the second row of the periodic table reflects second energy level which corresponds to 2 subshells obtained in this row.

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7 0

3 years ago

Most of the world’s energy comes from what three sources?

Simora [160]

Answers:

Most of the world’s energy comes from what three sources?

Oil, coal, and gas.

These energy sources are called fossil fuels and they are non-renewable resources.

Fuel type: oil

How it's formed: from the remains of ancient marine organisms

Its uses: transportation, industrial power, heating and lighting, lubricants, petrochemical industry, and use of by-products

Fule type: coal

How it's formed: when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial

Its uses: electricity generation, metal production, cement production, chemical production, gasification, and other industrial uses

Fuel type: gas

How it's formed: decomposed organic matter mixed with mud, silt, and sand on the seafloor

Its uses: heating & cooling buildings, cooking foods, fueling vehicles, and electricity generation

5 0

3 years ago

Which of the following elements is most likely to form an ion that will then form an ionic bond with an ion of a Group 1A elemen

solniwko [45]

Group 1A (the alkali metals) almost always form cations (positive ions). They'd need anions (negative ions) to ionic bond with. Beryllium (Be) is group 1A already and forms Be+ cation. Bromine is a halogen, and forms Br-, an anion. Platinum is a metal, and usually won't ionic bond with anything. Francium is rare and highly radioactive, plus it so happens to be group 1A as well. Only bromine can form the anion that the group 1A cations need.

3 0

3 years ago

What is the process where a solid changes directly into a gas without first turning into a liquid?

olya-2409 [2.1K]

Tip for next time, when you are looking at these things, rather than just posting it, take a look at your options. A solid to a gas, this means that melting cant be an option because that is solid to a liquid, evaporation cant be an option because that is liquid to a gas and condensation cant be because that is gas to a l. Therefore the answer must be sublimatio.

6 0

3 years ago

Read 2 more answers

A sample of gaseous PCl₅ was introduced into an evacuated flask so that the pressure of pure PCl₅ would be 0.50 atm at 523 K. Ho

Lera25 [3.4K]

Answer:

Kp = 0.2215

Kc = 0.0052

Explanation:

Step 1: The balanced equation

PCl5(g) → PCl3(g) + Cl2(g)

Step 2: given data

Initial pressure PCl5 = 0.50 atm

Temperature = 523 Kelvin

The actual pressure in the flask was found to be 0.74 atm.

Step 3: Calculate the pressure after the decomposition

Pressure of PCl5 after decomposition = 0.5 - X

Since the equation has a ratio 1:1 the pressure after the decomposition of PCl3 and Cl2 is X

Step 4: Calculate total pressure at equilibrium

0.74 atm = 0.5 atm - X + 2X

X = 0.74 - 0.5 = 0.24 atm

Step 5: Calculate Kp

Kp = P(PCl3)* P(Cl2) / P(PCl5)

Kp = 0.24² / 0.26 = 0.2215

Step 6: Calculate Kc

The ideal gas wet: P*V = nRT

with P= the pressure of the gas in atm

with V= the volume of the gas in L

with n= the number of moles

with R= the gas constant in L*atm/mol*K

T = the temperature in Kelvin

P= nRT/V

Kp= Kc*(RT)^Δn

Kc=Kp/(RT)^Δn

Kc= 0.2215 / (0.08206*523)^1

Kc= 0.0052

7 0

3 years ago