Most substances become less dense as the temperature increases. Which substance is an exception to this rule

Chemistry

2 answers:

stealth61 [152]3 years ago

6 0

The substance is water

oee [108]3 years ago

4 0

Answer : Ice at 0° C.

Explanation : The statement that most of the substances becomes less dense as the temperature increases is not true for ice.

As when the temperature increases the ice melts into liquid which is found to be more denser than ice. The mass is observed to be the same, but the volume decreases as the melting process occurs.

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3 years ago

What is the voltage of the voltaic cell Zn|Zn2+||Cu2+|Cu at 298 K if [Zn2+] = 0.2 M and [Cu2+] = 4.0 M? Cu2+ + 2e- → Cu Eo = +0.

OLga [1]

Answer : The voltage of the voltaic cell is 1.14 V

Explanation :

From the given cell representation, we conclude that

The copper will undergo reduction reaction will get reduced. Zinc will undergo oxidation reaction and will get oxidized.

The oxidation-reduction half cell reaction will be,

Oxidation half reaction: $Zn\rightarrow Zn^{2+}+2e^-$

Reduction half reaction: $Cu^{2+}+2e^-\rightarrow Cu$

Oxidation reaction occurs at anode and reduction reaction occurs at cathode. That means, gold shows reduction and occurs at cathode and chromium shows oxidation and occurs at anode.

The overall balanced equation of the cell is,

$Zn+Cu^{2+}\rightarrow Zn^{2+}+Cu$