3 years ago

Which physical method can be used for obtaining a sample of solid from a small beaker of salt water?

Chemistry

2 answers:

Makovka662 [10]3 years ago

6 0

I believe that the answer is B 100% sure

SOVA2 [1]3 years ago

3 0

Evaporation. People have been doing that since ancient times to get salt from sea water.

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What would be the IUPAC name of PoTs2

Vikentia [17]

Answer:

6-methylhept-1-en-3-one

Explanation:

6 0

3 years ago

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3241004551 [841]

Answer:

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5 0

3 years ago

A sample of hydrogen gas is found to be 8.50 L at a temperature of 38.0 C and a pressure of 725mm Hg. Find the volume at STP.

Vsevolod [243]

Temp must be Kelvin
38 C = 311.15 K
Volume at STP = 8.50 liters * (273.15 / 311.15) * (725 / 760) =
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Volume at STP = Present Volume * (273.15 / Present Temp °K) * (Present Pressure (Torr) / 760)

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3 years ago

A galvanic (voltaic) cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode c

Andre45 [30]

Answer: The standard potential of the cell is 0.77 V

Explanation:

We know that:

$E^o_{Ni^{2+}/Ni}=-0.25V\\E^o_{Cu^{+}/Cu}=0.52V$

The substance having highest positive $E^o$ reduction potential will always get reduced and will undergo reduction reaction.

The half reaction follows:

Oxidation half reaction: $Ni(s)\rightarrow Ni^{2+}(aq)+2e^-$

Reduction half reaction: $Cu^{+}(aq)+e^-\rightarrow Cu(s)$ ( × 2)

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

Putting values in above equation follows:

$E^o_{cell}=0.52-(-0.25)=0.77V$

Hence, the standard potential of the cell is 0.77 V

5 0

3 years ago

Calculate the no. of moles in 25gm of calcium phosphate Plz Fast Urgent

madreJ [45]

Answer:

0.162 mol

Explanation:

n=m/M

M= 20*3 + 15*2 + 8*4*2

M=154 g/mol

n=25g/154g/mol

n=0.162 mol

7 0

3 years ago