The periodic table displaysOA. all of the known elements that exist in the world today.
OB. only the important elements that exist in the world.
OC. only the important compounds that exist in the world.

Answers

Answer 1
Answer:

OA. all the known elements that exist in the world today.


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At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. What partial pressure of He would give a solubility of 0.730 M

Answers

We have that from the Question, it can be said that   The partial pressure of He would give a solubility of 0.730 M is

P_2=4.7atm

From the Question we are told

At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. What partial pressure of He would give a solubility of 0.730 M

Generally the equation for constant temperature  is mathematically given as

(C_2)/(C_1)=(P_2)/(P_1)\n\nTherefore\n\nP_2=(P_1C_1)/(C_1)\n\nP_2=(0.22*1.7)/(0.080)\n\nP_2=4.7atm\n\n

Therefore

The partial pressure of He would give a solubility of 0.730 M is

P_2=4.7atm

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Answer: Partial pressure of He that would give a solubility of 0.730 M is 15.5 atm

Explanation:

Henry's law states that the amount of gas dissolved or molar solubility of gas is directly proportional to the partial pressure of the liquid.

To calculate the molar solubility, we use the equation given by Henry's law, which is:

C_(He)=K_H* p_(liquid)

where,

K_H = Henry's constant =?

p_(He) = partial pressure = 1.7 atm

Putting values in above equation, we get:

0.080=K_H* 1.7atm\n\nK_H=0.047Matm^(-1)

To find partial pressure of He would give a solubility of 0.730 M

0.730=0.047Matm^(-1)* p_(liquid)

p_(liquid)=15.5atm

Thus partial pressure of He that would give a solubility of 0.730 M is 15.5 atm

Challenge question! One of the things hedoesn't mention is in order to use E=hf,
and any derivation of it, the energy must
be in JOULES. We have the energy in eV.
So this will be a two step question. First,
convert the energy to joules (or use the
number from our equation sheet) then
find the wavelength. Once you are done
with that, pick the correct answer below.
8.29x10^-16 m
3.75x10^26 m
2.48x10^-7 m
3.98x10^-26 m

Answers

bro this is too hard man can do just quit

Answer:

c

Explanation:

Which compound is classified as an electrolyte? a) C6H12O6
b)Ca(OH)2
c)C12H22O11
d)CH3OH

Answers

Answer:
            Option-B, Ca(OH)₂ is the correct answer.

Explanation:
                   By definition Electrolytes are those compounds which when poured in polar solvents dissociate into a positively charged specie called Cation and a negatively charged specie called an Anion. These ions have the potential to conduct electricity. 
                   So Ca(OH)₂ is dissolved in water it produces Ca⁺² cation and OH⁻ anions. So it acts as an Electrolyte.
                    While, C₆H₁₂O₆ (Glucose), C₁₂H₂₂O₁₁ (Table Sugar) and CH₃OH (Methanol) are covalent compounds and does not produce any positive or negative ions when dissolved in water.

Which of the following statements is true about exothermic reactions?

Answers

Answer:

An Exothermic Reaction , gives off more heat, and a little energy to its surroundings.

this can helps us figure out that the answer is , C, More heat is given off into its products.

Explanation:

The oxygen atom is smaller than the sulfur atom because _____(1) the outer electrons of oxygen are more effectively screened from the nuclear charge than are sulfur’s outer electrons. (2) the outer orbitals of oxygen are located closer to the nucleus than those of sulfur. (3) the oxygen atom is larger than the sulfur atom. (4) the outer electrons of oxygen are less effectively screened from the nuclear charge than are sulfur’s outer electrons. (5) the outer orbitals of oxygen are located farther away from the nucleus than those of sulfur.

Answers

Answer: Option (2) is the correct answer.

Explanation:

Atomic number of oxygen atom is 8 and its electronic distribution is 2, 6. So, it contains only 2 orbitals which are closer to the nucleus of the atom.

As a result, the valence electrons are pulled closer by the nucleus of oxygen atom due to which there occurs a decrease in atomic size of the atom.

Whereas atomic number of sulfur is 16 and its electronic distribution is 2, 8, 6. As there are more number of orbitals present in a sulfur atom so, the valence electrons are away from the nucleus of the atom.

Hence, there is less force of attraction between nucleus of sulfur atom and its valence electrons due to which size of sulfur atom is larger than the size of oxygen atom.

Thus, we can conclude that the oxygen atom is smaller than the sulfur atom because the outer orbitals of oxygen are located closer to the nucleus than those of sulfur.

Final answer:

The oxygen atom is smaller than the sulfur atom because the outer orbitals of oxygen are located closer to the nucleus than those of sulfur.

Explanation:

The correct option is (2) the outer orbitals of oxygen are located closer to the nucleus than those of sulfur.



To understand why the oxygen atom is smaller than the sulfur atom, we need to consider their electron configurations. Oxygen has 8 electrons and sulfur has 16 electrons. Oxygen's electron configuration is 1s²2s²2p⁴, while sulfur's electron configuration is 1s²2s²2p⁶3s²3p⁴.



The outer orbitals of an atom, which are the valence orbitals, are the ones involved in bonding. The electrons in these orbitals determine the size of the atom. In the case of oxygen and sulfur, the outer orbitals of oxygen (2p orbitals) are closer to the nucleus compared to sulfur's outer orbitals (3p orbitals). As a result, the oxygen atom is smaller than the sulfur atom.

Learn more about Atomic structure here:

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How to determine acid base reactions

Answers

Answer : Acid-base reaction is determined when hydrogen ion of an acid neutralize by the hydroxide ion of a base then it gives water.

Explanation :

Acid-base reaction : It is defined as the reaction in which an acid reacts with a base to give salt and water.

Acid-base reaction is determined when hydrogen ion of an acid neutralize by the hydroxide ion of a base then it gives water.

For example: When hydrochloric acid react with sodium hydroxide base to give sodium chloride salt and water.

The balanced acid-base reaction is:

HCl+NaOH\rightarrow NaCl+H_2O