Chemistry, 02.03.2020 21:48 milkshakegrande101

Select True or False: PbO2 is oxidized in this process. (Batteries in our cars generate electricity by the following chemical reaction.) Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

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Answer from: jessicascott120305

Answer : The given statement is false.

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

Reducing agent : It is defined as the agent which helps the other substance to reduce and itself gets oxidized. Thus, it will undergo oxidation reaction.

Oxidizing agent : It is defined as the agent which helps the other substance to oxidize and itself gets reduced. Thus, it will undergo reduction reaction.

The given chemical reaction is,

$Pb+PbO_2+2H_2SO_4\rightarrow 2PbSO_4+2H_2O$

In this reaction, the oxidation state of Pb is (0), oxidation state of Pb in PbO_2 is (+4) and oxidation state of Pb in PbSO_4 is (+2).

The oxidation-reduction half reaction will be :

Oxidation : $Pb\rightarrow Pb^{2+}+2e^-$

Reduction : $Pb^{4+}+2e^-\rightarrow Pb^{2+}$

In this reaction, PbO_2 shows reduction that means it is reduced and Pb shows oxidation that means it is oxidized.

Hence, the given statement is false.

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

The gas would begin to expand, and eventually the can would burst or explode.

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Select True or False: PbO2 is oxidized in this process. (Batteries in our cars generate electricity...

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