URGENT HELP PLEASE what is an isotope? And how do you calculate isotopes

1 answer:

4 0

Isotopes are atoms of the same element with the same number of protons but different number of neutrons. you calculate them by multiplying the abundance of the isotope by its relative atomic mass and then adding them up

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g Which ONE of the following pure substances will exhibit hydrogen bonding? A) methyl fluoride, FCH3 B) dimethyl ether, CH3C–O–C

luda_lava [24]

Answer:

C) formaldehyde, H2C=O.

Explanation:

Hello,

In this case, given that the hydrogen bondings are known as partial intermolecular interactions between a lone pair on an electron rich donor atom, particularly oxygen, and the antibonding molecular orbital of a bond between hydrogen and a more electronegative atom or group. Thus, among the options, C) formaldehyde, H2C=O, will exhibit hydrogen bonding since the lone pair of electrons of the oxygen at the carbonyl group, are able to interact with hydrogen (in the form of water).

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8 0

3 years ago

5. I have a mixture of salt, water,

dolphi86 [110]

Iron is left in the filter and salt solution (salt and water) passes into the cup.

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7 0

3 years ago

Is the name of the energy made by mitochondria

meriva

Answer:

the powerhouse of the cell

Explanation:

jk its called adenosine triphosphate

6 0

4 years ago

Which of the following Group 17 elements is the least reactive?

satela [25.4K]

The given question is incomplete. The complete question is :

Which of the following Group 17 elements is the least reactive

a) Flourine

b) Chlorine

c) Astatine

d) Iodine

Answer: c) Astatine

Explanation:

Halogen is the name given to Group 17 family with general electronic configuration of $ns^2np^5$ which have 7 valence electrons and thus easily gain one electron to attain stable configuration.

As we move down the group from flourine to chlorine to bromine to iodine to astatine , the valence shell moves farther from nucleus and thus tendency to accept the electron decreases and thus reactivity also decreases.

Thus Astatine is the least reactive of all.

7 0

3 years ago

To dilute a HCl solution from 0.400 M to 0.100 M the final volume must be

sp2606 [1]

Answer:

The final volume must be 400 mL.

Explanation:

Let us assume the Initial volume as 100ml

Using dilution factor formula

$\\$M_{1} \times V_{1}=M_{2} \times V_{2}$\\\\$0.400 M \times 100 m l=0.100 M \times V_{2}$$