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NeTakaya
3 years ago
8

I need an answer now please asap and you will me marked brainiest please it's missing I need it now.

Chemistry
1 answer:
kogti [31]3 years ago
8 0

Answer:

Molecular Mass:

1. 40g per mole

2. 19g per mole

3. 64g per mole

4. 32 g per mole

5. 17g per mole

6. 59.5g per mole

7.58.5 g per mole

8.220g per mole

9. 78g per mole

10. 200g per mole

Explanation:

Molecular Mass = Number of atom x atomic mass of an element

Your Welcome~

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Which of the fallowing scientific claims about the bond in the molecular compound HF is most likely to be true?
DENIUS [597]

The bond is highly polar is the scientific claim about the bond in the molecular compound HF is most likely to be true.

The term polar means that there is separation of charges, the bonds will be the more polar the greater the difference in electronegativity between the bonded atoms.

  • In hydrogen fluoride, for example, F is more electronegative than H because its nucleus, with 9 positive charges, attracts e-shares with H more strongly than the nucleus of H, with only one positive charge.

  • Therefore, the e- shared by covalence will be closer to F than to H and the molecule forms a permanent dipole.

Therefore, we can conclude that the bond is highly polar is the scientific claim about the bond in the molecular compound HF is most likely to be true.

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Sodium-24 has a half life how much sodium-24 will remain in an 18 g sample after 75 hours
frutty [35]

Answer:

\boxed{\text{0.56 g}}

Explanation:

The half-life of Na-24 (15 h) is the time it takes for half of it to decay.  

After one half-life, half (50 %) of the original amount will remain.  

After a second half-life, half of that amount (25 %) will remain, and so on.  

We can construct a table as follows:  

  No. of                 Fraction          Mass

<u>half-lives   t/da   Remaining   Remaining/g </u>

      0             0           1                      18

       1            15            ½                    9.0

      2           30            ¼                    4.5

      3           45            ⅛                    2.2

      4           60            ⅟₁₆                   1.1

      5           75            ⅟₃₂                   0.56

      6           90           ⅟₆₄                   0.28

We see that  \boxed{\textbf{0.56 g}} remain after five half-lives (75 h).

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3 years ago
What kind of melocule is water?A:nonpolarB:ionicC:polarD:charged
hram777 [196]
The correct answer is:  [C]:  "polar" .
_____________________________________________________  
   " Water " ; which is:  " H₂O " ; 
_____________________________________________________
is a:
_____________________________________________________

  — polar;  → {eliminate:  "Choice  [A]:  "non-polar"} ;

                  → {and consider:  "Choice: [C]:  "polar" } ; 

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                           →  {eliminate:  "Choice:  [D]:  "charged" .}.
_______________________________________________________
    — 
compound.
_______________________________________________________       

The correct answer is:  [C]:
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_______________________________________________________
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Why is a solution not a pure substance
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It is not a pure substance, because a solution are mixed chemicals in a way that the molecules are not bonded with one another. Thus, separating them from compounds and elements, which are pure substances.
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