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3 years ago

When zinc pieces are are put in copper sulphate solution what happens ?

1 answer:

4 0

Explanation -
Zinc is more reactive than copper. So, by adding zinc to CuSO4 solution, zinc displaces copper from copper sulphate & forms zinc sulphate solution. This is indicated by colour change from blue to colourless. CuSO4 solution has a blue colour while ZnSO4 solution is colourless.

Chemical equation -
Zn(s) + CuSO4(aq) -> Cu(s) + ZnSO4 (aq).

Type of reaction -

It's a displacement reaction.

It's a redox reaction. Oxidation number of Cu decreases from 2 to 0 so it's reduced. Oxidation number of Zn increases from 0 to 2 so it's oxidised.

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Who asks scientific questions?

Katena32 [7]

Answer:

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Student conducts an experiment to determine the enthalpy of solution for lithium chloride dissolved in water. the student combin

nirvana33 [79]

Answer:- $\Delta H_s_o_l_n=-37.2\frac{kJ}{mol}$

Solution:- First of all we calculate the heat absorbed or released when the solute is added to the solvent. Here the solute is LiCl and the solvent is water.

To calculate the heat absorbed or released we use the formula:

$q=ms\Delta T$

q = heat absorbed or released

m = mass of solution

s = specific heat capacity

and $\Delta T$ = change in temperature

mass of solution = mass of solute + mass of solvent

mass of solution = 5.00 g + 100.0 g = 105.0 g

(note:- density of pure water is 1 g per mL so the mass is same as its volume)

$\Delta T$ = 33.0 - 23.0 = 10.0 degree C

s = $4.18\frac{J}{g.^0C}$

Let's plug in the values in the formula and calculate q.

q = $105.0g(4.18\frac{J}{g.^0C})(10.0^0C)$

q = 4389 J

To calculate the enthalpy of solution that is $\Delta H_s_o_l_n$ we convert q to kJ and divide by the moles of solute.

moles of solute = $5.00g(\frac{1mol}{42.39g})$

= 0.118 moles

q = $4389J(\frac{1kJ}{1000J})$ = 4.389 kJ

$\Delta H_s_o_l_n=\frac{4.389kJ}{0.118mol}$

$\Delta H_s_o_l_n$ = $37.2\frac{kJ}{mol}$

Since the heat is released which is also clear from the rise in temperature of the solution, the sign of enthapy of solution will be negative.

So, $\Delta H_s_o_l_n=-37.2\frac{kJ}{mol}$

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3 years ago

Which event always involves a chemical change? boiling melting conducting burning

Pachacha [2.7K]

Answer:

Burning

Explanation:

Because it's right.

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When two atoms of the same element have different numbers of neutrons and therefore different atomic masses, what are they?

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All atomic elements consist of a positively charged nucleus surrounded by a cloud of negatively charged electrons. When two atoms of the same element have different numbers of neutrons and therefore a different atomic mass they are known as isotopes of the given element. An example of an isotope is deuterium, which is an isotope of hydrogen.

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The correct tool for measuring mass is ...

QveST [7]

A electronic balance

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