CHEMISTRY HIGH SCHOOL

When the compound, Na2S, is mixed with water, the Na2S is:soluble because all Na+1 compounds are soluble in water

insoluble because most Na+1 compounds are insoluble in water

soluble because all S−2 compounds are soluble in water

insoluble because there are no water soluble S−2 compounds

Answers

Answer 1
Answer:

Answer: Option (a) is the correct answer.

Explanation:

Atomic number of sodium is 11 and its electronic distribution is 2, 8, 1. Whereas atomic number of sulfur is 16 and its electronic distribution is 2, 8, 6.

So, when both sodium and sulfur chemically combine together then it results in the formation of an ionic bond due to transfer of an electron from sodium to sulfur atom.

Sodium changes into Na^(+) by losing an electron and sulfur changes into S^(2-) by gain of two electrons from two sodium atoms.

As it is known that water is a polar solvent and all ionic substances will dissolve in water.

Therefore, we can conclude that when the compound, Na_2S, is mixed with water, the Na_2S is soluble because all Na^(+1) compounds are soluble in water.
Answer 2
Answer:

When the compound, Na2S, is mixed with water, the Na2S is soluble because all Na+1 compounds are soluble in water. The rest of the choices do not answer the question above.

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What is the correct molar mass for the compound CaBr3

Answers

CaBr₃ = 40 + 80 * 3 = 280 g/mol

hope this helps!

what volume of a 0.716 m kbr solution is needed to provide 25.5 g of kbr? 35.7 ml 14.7 ml 299 ml 0.299 ml 153 ml

Answers

Answer:

\huge{ \boxed{299 \: ml}}

Explanation:

The volume of KBr required can be found by using the formula;

v = (m)/(M * c)

c is the concentration in M , mol/dm³ or mol/L

v is the volume in L or dm³

m is the mass in grams

M is the molar mass in g/mol

From the question;

m = 25.5 g

c = 0.716

Molar mass (M) of KBr = 39 + 79.9 = 118.9 g/mol

\therefore \: v = (25.5)/(118.9 * 0.716) \n = 0.299 \: l \n \n \text{but} \: 1 \: l \: = 1000 \: ml \n \therefore0.299l \: = (0.299)/(1) * 1000 \: ml \n = 299 \: ml \n \therefore \: v = 299 \: ml

What controls which substances can move into and out of a cell?

Answers

the cell wall and nucleus

A 182 pound male body was found decomposing in a dense wooded area 1.43 kilometers away from the nearest road. How many meters would a suspect have to drag the body into the woods if the victim was already deceased and transferred to this secondary location from the vehicle

Answers

Answer:

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Explanation:

An element X has two isotopes. X–15 has 7 protons and 8 neutrons. Determine the atomic number and mass number of the second isotope, which has 10 neutrons in its nucleus.. How would I do this and get the answer?

Answers

Answer:The atomic mass of the second isotope of an element X 17 amu with atomic number of 7 and it is represented by X-17.

Explanation:

Number of protons in isotope X-15,(p) = 7

Number of neutrons in isotope X-15,(n) = 8

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Atomic number = Number of protons in an atom of an element

Number of protons in the isotopes of same element remains the same

Number of neutrons in second isotope of an element X,(n) = 10

Atomic mass of the second isotope of an element X= (p) + (n) = 7 + 10= 17 amu

The atomic mass of the second isotope of an element X 17 amu with atomic number of 7 and it is represented by X-17.

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Answers

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