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natali 33 [55]
3 years ago
14

How many

Chemistry
1 answer:
MatroZZZ [7]3 years ago
5 0

Answer:

8 neutrons

A is the number of neutrons plus protons in the nucleus. However, we already know that there are 7 protons. Therefore, there must be 8 neutrons in the nucleus to add up to 15. Table 3.

Element Symbol Number of Neutrons

carbon 146C 8

nitrogen 147N 7

157N 8

oxygen 168O 8

Explanation:

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18. How many moles of atoms are there in each of
Lelechka [254]

a) 1 mole of Ne

b) i/2 mole of Mg

c) 1570 moles of Pb.

d) 2.18125*10^-13 moles of oxygen.

                     

Explanation:

The number of moles calculated by Avogadro's number in 6.23*10^23 of Neon.

6.23*10^23= 1/ 6.23*10^23

                   = 1 mole

The number of moles calculated by Avogadro's number in 3.01*10^23 of  Mg

3.2*10^23=1/6.23*10^23

                = 1/2 moles of Pb.

Number of moles in 3.25*10^5 gm of lead.

atomic weight of Pb=

n=weight/atomic weight

  = 3.25*10^5/ 207

  = 1570 moles of Pb.

Number of moles 4.50 x 10-12 g O

number of moles= 4.50*10^-12/16

                            =  2.18125*10^-13 moles of oxygen.

3 0
3 years ago
Which force holds together an atom's nucleus? a the strong force b the weak force c electromagnetism d gravity?
hichkok12 [17]
<span>a) The strong nuclear force

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4 0
4 years ago
how does a substances temperature change when the average kinetic energy of its particles increases and they decrease
alukav5142 [94]
Temperature is a measure of the energy of moving particles, so if the average kinetic energy is increasing, then the temperature would increase as well. 
6 0
3 years ago
Which describes TWO important functions of DNA?
Troyanec [42]

Answer:

It copies itself and gives instructions for building cells.

It provides energy to cells and passes from parent to  offspring

Explanation:

The DNA is the genetic materials of the cell upon which any form of inheritance is predicated.

This giant molecules is a very important organelle in all living organisms. It has a double helix structure and can be found within the nucleus.

  • The DNA copies itself and gives instruction for building cells.
  • It has important information needed by the cell to produce protein so DNA replication is a vital process.
  • The DNA is also able to ration energy within the cell.
  • It passes genetic materials from parents to offspring
5 0
3 years ago
Read 2 more answers
Give the structure of the product obtained when cyclopropene loses a proton. Will the product be aromatic or not?
astra-53 [7]

Answer:

not aromatic

Explanation:

Cyclopropene -

as the compound is is made to lose a proton , and gains a negative charge on its ring ,

Now, The ring can become aromatic or anti - aromatic depending on the number of π electrobns ,

According to Huckel 's rule ,

The cyclic compounds with ( 4n+2 ) π electrons , where , n = 0, 1, 2, 3 ... , are considered to be aromatic in nature ,

And the cyclic compounds with ( 4n ) π electrons , where , n = 1, 2, 3 ... , are considered to be anti - aromatic in nature.

Now, for the cyclopropene structure , the number of π electron are equal to 4 , 2 from the double bond and 2 from the negative charge .

Therefore , the compound becomes not aromatic or anti - aromatic .

3 0
3 years ago
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