The element oxygen has valence electrons

Answers

Answer 1

Answer:

Answer:

it’s electron configuration is 1s^2 2s^2 2p^4. To determine valence electrons, add the outermost s and p orbitals. In an oxygen atom, 8 electrons are present. Electron present in the first shell (n=1) 2n^2=2 (1)^2=2 (1)=2.

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PLZZZZZZZZZZZZ HELPPPPPPPPP BRAINLIEST FOR WHO GETS IT RIGHTTTTTTWhat is the mass of reactants in the following equation?N2 + 3H2 ----> 2NH3
Question 3 options:

34.05 amu

31.03 amu

30.02 amu

15.01 amu

Answers

Answer: 34.05

Explanation:

2N and 6H = abt 34

1. Which statement describes the particles of an ideal gas, based on thekinetic molecular theory?*

O There are attractive forces between the particles.

O The particles move in circular paths.

O The collisions between the particles reduce the total energy of the gas.

О

The volume of the gas particles is negligible compared with the total volume of the

gas.

Answers

Answer:the volume of the gas particles is negligible compared with the total volume of the gas.--D

Explanation:

According to the Kinetic Molecular Theory for ideal gases, it states that

--Gases are composed of larges molecules which are in constant random motion in a straight line

--The volume of the gas particles is negligible compared to the total volume in which the gas is contained.

-----The Attractive and repulsive forces between gas molecules is insignificant ie There are no interactive forces.

----The collisions of the particles are perfectly elastic and energyis being transferred between the particles but the total energy remaining constant

From the statements of the kinetic Molecular theory of ideal gases, it can be seen that the statement which describes the particles of an ideal gas is option D which is The volume of the gas particles is negligible compared with the total volume of the gas--- ---This gives the reason why gases can be compressed. Since there are no inter molecular forces between them. The particles of an ideal gas will move at the same random motion resulting to high pressures, compressing the gas and making the volume negligible or insignificant.

A 135 g sample of H20 at 85°C is cooled. The water loses a total of 15 kJ of energy in the coolingprocess. What is the final temperature of the water? The specific heat of water is 4.184 J/g.°C.

A. 112°C

B. 58°C

C. 70°C

D. 84°C

E. 27°C

Answers

Answer:

B. 58°C

Explanation:

Hello,

In this case, the relationship among heat, mass, specific heat and temperature for water is mathematically by:

$Q=mCp\Delta T=mCp(T_2-T_1)$

In such a way, solving for the final temperature $T_2$ we obtain:

$T_2=T_1+(Q)/(mCp)$

Therefore, we final temperature is computed as follows, considering that the involved heat is negative as it is lost for water:

$T_2=85\°C+(-15kJ*(1000J)/(1kJ) )/(135g*4.184(J)/(g\°C) )\n\nT_2=58\°C$

Thereby, answer is B. 58°C.

Regards.

Final answer:

The final temperature of the water is approximately 58°C (Option B) after it has lost 15 kJ of energy in the cooling process.

Explanation:

To calculate the final temperature of the water, we can use the formula of heat loss or gain, Q = mcΔT, where Q is the heat loss or gain, m is the mass, c is the specific heat, and ΔT is the change in temperature.

Setting the given values into our formula: -15,000 J = (135 g) * (4.184 J/g°C) * (T_final - 85°C).

Solving this equation for T_final gives us T_final ≈ 58°C. Hence, the suitable answer would be option B: 58°C.

Learn more about Heat Transfer here:

brainly.com/question/13433948

#SPJ3

Explain how paper chromatography could be used to separate a mixture of different coloured inks

Answers

The mobile phase is a suitable liquid solvent or mixture of solvents. You probably used paper chromatographyas one of the first things you ever did in chemistry to separate out mixturesof coloured dyes - for example, the dyes which make up a particular ink

I hope that this answer helps you out

WORTH A LOT OF POINTS! just copy what on the picture for notes so i can copy and paste i do not feel like writing all of that down

Answers

Basically the two ljnes are a ladder and it builds up a DNA which then helps the body and protects it

Answer:

A base pair is a pair of bases that form hydrogen bonds in the double stranded DNA molecule.

- Adenine-thymine: A-T

- Guanine-cytosine: G-C

Replication Process:

- Double strand unwinds.

- New nucleorides line up via base pairing.

- Colvalent bonds link nucleotides together in the new strands.

Explanation:

All the following are characteristic properties of phosphorus. Which one is a chemical property?(a) When exposed to air, white phos- phorus will burn spontaneously, but red phosphorus will not.
(b) Red phosphorus and white phos- phorus are solids.
(c) The white form is soluble in liquid carbon disulfide but is insoluble in water.
(d) The red form of phosphorus is in- soluble in both water and carbon disulfide.
(e) The red form melts at about 600 ◦ C, and the white form melts at44◦ C.

Answers

Red phosphorus and white phosphorus are solid is a physical property

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