Chemistry, 29.01.2020 11:58, thomasalmo2014

In an exothermic reaction, the energy stored in the chemical bonds of the reactants is
a) equal to the energy stored in the bonds of the products
b) greater than the energy stored in the bonds of the products
c) less than the energy stored in the bonds of the products
d) less than the heat released

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Answers

option B) greater than the energy stored in the bonds of the products.

Justification:

1) In an exothermic reaction, energy is released to the surroundings as product of the reaction.

2) By an energy balance (convervation of energy), you get:

Chemical energy of the reactants = chemical energy of the products + E

Since, E >0 (exothermic reaction),

chemical energy of the reactants - chemical energy of the products > 0

And finally: chemical energy of the reactants > chemical energy of the products.

Also, you need to know that chemical energy is a kind of potential energy; it is the energy stored in the bonds of the compounds.

So, the answer is the energy stored the bonds of the reactants is greater than the energy stored in the bonds of the products (option B.)

answered: angeljaylyn123

answered: Guest

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.