CHEMISTRY HIGH SCHOOL

The atomic mass of an element is 32.07 u and its atomic number is 16. The number of protons contained in the nucleus of an atom of this element is (A) 16
(B) 31
(C) 32
(D) 48

Answers

Answer 1
Answer:
I THINK IT IS 16 BECAUSE THE ATOMIC NUMBER AND THE NUMBER OF PROTONS ARE THE SAME
Answer 2
Answer: atomic number = number of electrons = number of protons( by JJ thomson's theory)

Thus, the number of protons is 16

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Answers

The answer is saturated

Both renewable and non renewable give us what?

Answers

Answer: Both heat and energy.

Explanation:

A neutral atom of iron has a mass number of 56 and an atomic number of 26. How many protons, electrons and neutrons are in this atom? Explain how you determine each number.

Answers

so here its given ..
mass no. = 56
and atomic no. = 26

=> in an atom there is an equal number of electrons and protons ...(e=p)..
=> also atomic number is the number of the electrons or protons ..
=> so here we got the no. of electrons and protons ..which is 26 ..
=> to find the number of neutrons in an atom , subtract atomic number from the mass number..i.e, 56 - 26 = 30 ...

=> so  there are 26 electrons , 26 protons and 30 neutrons in the given atom ...

Hope it helps !!!

A) How many moles of gold atoms are present in a 295-gram sample of gold? B) How many gold atoms would there be in the sample?

Answers

The molar mass of gold, Au, as seen on the periodic table, is 196.97 grams per mole. So, do this to find the number of moles in a 295 gram sample:

(295g\ Au)((1mol\ Au)/(196.97g\ Au)) = 1.49769mol\ Au

So, a 295 gram sample of gold has about 1.5 moles of gold in it.

To find the number of atoms, multiply the number of moles by Avogadro's number:

(1.49769mol\ Au)((6.022*10^(23)\ atoms)/(mol)) = 9.02 * 10^(23)\ atoms\ Au
5 gram of 197 Au contain 1.53*10^22 atoms. so just multiply that with 59 to get 295 grams :)

What is produced when an acid reacts with a metal?a. Salt and hydrogen
c. Water and base
b. Carbon and salt
d. Carbon dioxide and water

Answers

Answer: Option (a) is the correct answer.

Explanation:

When an acid reacts with a metal then there occurs formation of a salt along with liberation of hydrogen gas.

For example, Zn + 2HCl \rightarrow ZnCl_(2) + H_(2)

Here, Zn (zinc) is the metal which when added to hydrogen chloride acid them it leads to the formation of salt zinc chloride and hydrogen gas.

This type of reaction is also known as single displacement reaction.

Thus, we can conclude that salt and hydrogen is produced when an acid reacts with a metal.
The answer should be A.  The metal will replace the hydrogen as the cation which will result in the a salt and hydrogen gas.  An example is Mg reacting with HCl which produces MgCl₂ (salt) and H₂ (hydrogen).

I hope this helps.  Let me know if anything is unclear.

Which atomic model was proposed as a result of J. J. Thomson’s work?

Answers

J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. He then proposed the Plum Pudding Model.
The atomic model was proposed as a result of J. J. Thomson’s work was the plum pudding model.

Hope I helped : )
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