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3 years ago

Substances that cannot be separated and found on a periodic table

Chemistry

2 answers:

galina1969 [7]3 years ago

5 0

B. elements i hope that helps

GaryK [48]3 years ago

4 0

Substances that cannot be separated and found on a periodic table are elements.

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If aluminum is heated from 650°C to 670°C, then it will change from a A.liquid to a gas. B.liquid to a solid. C.solid to a liqui

kirill115 [55]

Answer: C

Explanation:

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3 years ago

Please answer as fast as you can

ki77a [65]

Answer:

Probably answer D.

Explanation:

It makes the most sense because it's just changing the temp of the water

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2 years ago

Read 2 more answers

I need to solve for x in this equation ln(760/630)=32/8.314(1/x-1/329.5)

Anuta_ua [19.1K]

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3 years ago

Use the provided reduction potentials to calculate ArGº for the following balanced redox reaction: Pb2+(aq) + Cu(s) → Pb(s) + Cu

nydimaria [60]

Answer : The correct option is, +91 kJ/mole

Solution :

The balanced cell reaction will be,

$Cu(s)+Pb^{2+}(aq)\rightarrow Cu^{2+}(aq)+Pb(s)$

Here copper (Cu) undergoes oxidation by loss of electrons, thus act as anode. Lead (Pb) undergoes reduction by gain of electrons and thus act as cathode.

First we have to calculate the standard electrode potential of the cell.

$E^0_{[Pb^{2+}/Pb]}=-0.13V$

$E^0_{[Cu^{2+}/Cu]}=+0.34V$

$E^0_{cell}=E^0_{cathode}-E^0_{anode}$

$E^0_{cell}=E^0_{[Pb^{2+}/Pb]}-E^0_{[Cu^{2+}/Cu]}$

$E^0_{cell}=-0.13V-(0.34V)=-0.47V$

Now we have to calculate the standard Gibbs free energy.

Formula used :

$\Delta G^o=-nFE^o_{cell}$

where,

$\Delta G^o$ = standard Gibbs free energy = ?

n = number of electrons = 2

F = Faraday constant = 96500 C/mole

$E^o$ = standard e.m.f of cell = -0.47 V

Now put all the given values in this formula, we get the Gibbs free energy.

$\Delta G^o=-(2\times 96500\times (-0.47))=+90710J/mole=+90.71kJ/mole\approx +91kJ/mole$

Therefore, the standard Gibbs free energy is +91 kJ/mole

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3 years ago

What questions, if we were to answer them, would

Margarita [4]

Answer:

When our bodies are dry and wind blows by, we lose some energy to the air molecules. When are bodies are wet, we have a substance on our skin that likes to absorb heat. So when wind blows by, we lose a LOT of energy to the air molecules. When the body loses heat energy, our body temperature drops.

Explanation:

hope it helps

plzz mark it as brainliest...

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3 years ago