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Taya2010 [7]
3 years ago
13

Will mark brainliest

Chemistry
1 answer:
poizon [28]3 years ago
5 0

Explanation:

solid, liquids and gases are all made up of atoms and molecules

contrast

solids have a definite shape, liquids takes the shape of the container that contains it while gases do not have a shape

solids move about their mean positions, liquids move more freely while gases move in random motion

solids cannot be easily compressed, liquids can be compressed while gases can be easily compressed

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Between Lab Period 1 and Lab Period 2, design a separation scheme for all 4 cations. Use the results of your preliminary tests a
fiasKO [112]

Answer:

                    SEPARATION SCHEME FOR  CATIONS

GIVEN  CATIONS : Ag^{+} \ ,  Fe^{3+} , Cu^{2+}, Ni^{2+}

     

    Step 1:   Add 6mol/dm^3 of HCl to the mixture solution

    Result : This would cause a precipitate of AgCl to be formed

    Reaction :  Ag^{+} _{(aq)} + Cl^{-} _{(aq)}  ---------> AgCl(ppt)

    Step 2 : Next is to remove the precipitate and add H_2S to the remaining          

                 solution in the presence of 0.2 \ mol/dm^3 of HCl

     Result : This would cause a precipitate of CuS to be formed

     Reaction :  Cu^{2+}_{(aq)} + S^{2-}_{(aq)} ------> Cu_2S(ppt)

 

     Step 3: Next remove the precipitate then add 6 \ mol/dm^3 of aqueous      

                 NH_3 (NH_3 \cdot H_2 O) , process the solution in a centrifuge,when the  

                 process  is done then sort out the  precipitate from the  solution

                 Now this precipitate is   Fe(OH)_3 and the remaining solution

                contains  (Ni (NH_3)_6)

                 Next take out the precipitate to a different beaker and add HCl

                to it   this will dissolve it, then add a drop of NH_4SCN this will

                form  a precipitate  Fe(SCN)_{6}^{3-} which will have the color of

                 blood  indicating the presence of Fe^{3+}

             

   Reaction :   F^{3+}_{(aq)} + 30H^-_{(aq)} --------->Fe(OH)_3_{(aq)}

                        Fe (OH)_{(s)} _3  + 3H^{+}_{aq} -------> Fe^{3+}_{aq} + 3H_2O_{(l)}

                         Fe^{3+} + 6SCN^{-} -----> Fe(SCN)_6 ^{3-}

                      Now the remaining mixture contains Ni^{2+}

     

       

Explanation:

6 0
3 years ago
New oceanic lithosphere forms as a result of
Oksana_A [137]

Answer:

A. sea-floor spreading.

Explanation:

The sea-floor spreading is the result of the new oceanic lithosphere

3 0
3 years ago
Read 2 more answers
Which of these radioactive waste elements would be stored at New Mexico's Waste Isolation Pilot Plant?
Luden [163]
C and D they're both right
6 0
3 years ago
Read 2 more answers
Which of the following nuclei is most likely to decay by positron emission? Explain your choice.
Damm [24]

Answer:

(b) manganese-51

Explanation:

Positron emission or β+ decay is emission of positron from nucleus. It is observed for the nuclides in which ratio to the neutron and the proton is low. These type of nuclides lie below band of the stability. Positron decay is conversion of proton into neutron with emission of positron.

Manganese-51 is most likely to decay by the positron emission.

The n:p ratio:

For Cr-53 is:

\frac{29}{24}=1.21

For Mn-51 is:

\frac{26}{25}=1.04

For Fe-59 is:

\frac{33}{26}=1.27

As stated above, positron decay occurs when n:p ratio is low.

<u>Thus, Mn-51 has the lowest n:p ratio and therefore is likely to decay by the positron emission.</u>

3 0
4 years ago
256.3 mL + 2L + 137 mL=
Serjik [45]

Answer:

2 393.3 mL

Explanation:

(256.3 mL) + (2 L) + (137 mL) =

2 393.3 mL

3 0
4 years ago
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