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kakasveta [241]
3 years ago
12

Can somebody please explain endothermic and exothermic reactions?​

Physics
2 answers:
4vir4ik [10]3 years ago
7 0
An endothermic process is any process which requires or absorbs energy from its surroundings, usually in the form of heat. It may be a chemical process, such as dissolving ammonium nitrate in water, or a physical process, such as the melting of ice cubes.

DescriptionAn exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy. Exothermic Reaction means "exo" meaning releases and "thermic" means heat.



Hope this helps :)
Alina [70]3 years ago
3 0

Answer:

An exothermic reaction is a reaction in which heat is liberated to the surroundings

An endothermic reaction is a reaction in which heat is absorbed from the surroundings

Explanation:

Exothermic reaction is one in which heat is liberated to the surroundings.this occurs when the total heat content of the products is less than that of the reactants.

Endothermic reaction is one in which heat is absorbed from the surroundings.this occurs when the total heat content of the products is more than that of the reactants

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djyliett [7]

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<u>Explanation:</u>

The Fetus Stage of Pregnancy:

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7 0
4 years ago
A 15-µF capacitor is charged to 40 V and then connected across an initially uncharged 25-µF capacitor. What is the final potenti
Kobotan [32]

Answer:

24volts

Explanation:

If a 15-µF capacitor is charged to 40V, the charge across the capacitor can be calculated using the formula;

Q = CV where;

Q is the charge flowing across the capacitor

C is the capacitance of the capacitor. = 15-µF

V is the voltage = 40V

Q = 15×10^-6×40

Q = 0.0006coulombs

If the charge of 0.0006coulombs is then connected across an initially uncharged 25-µF capacitor, the potential difference across the 25-µF can be calculated using the initial expression;

Q = CV

V = Q/C

V = 0.0006/25×10^-6

V = 24Volts

Therefore, the final potential difference across the 25-µF capacitor will be 24volts

6 0
3 years ago
Read 2 more answers
Account for each of the following properties of solids: (a) the definite volume, (b) the relatively high density, (c) the extrem
9966 [12]

Answer:

<em>a. The molecules of solid are closely packed together</em>

<em>b. particles are so close, hence a high density</em>

<em>c.rate of diffusion is slow due to strong force of attraction between molecules of solid.</em>

Explanation:

(a)The molecules of solids are very much packed together hence very hard to compress and the force of attraction between molecules is strong hence very hard to expand . For this reason solids occupy a definite volume.

b. Because the molecules of solid is more closer than those of liquid and gas. Solids have a much higher density, hence a higher relative density. Density = mass/volume. for solids a huge amount of mass occupies a low volume space. A low volume and huge mass will result in high density

c. The diffusion of solids is very slow due to the strong force of attraction between the molecules of solids. However this diffusion can be made faster by the application of heat. This will increase the kinetic energy of the solid molecules.

6 0
3 years ago
Explain and answer plz
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3 0
3 years ago
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The operating temperature of a tungsten filament in an incandescent light bulb is 2450 K, and its emissivity is 0.350. Find the
natulia [17]

Answer:

The value is   A =  2.80 *10^{-4} \  m^2

Explanation:

From the question we are told that

The  operating temperature is  T  =  2450 \  K

The emissivity is  e =  0.350

 The  power rating is  P  =  200 \  W

Generally the area is mathematically represented as

      A = \frac{P}{ e *  \sigma  *  T^2}

Where  \sigma is the Stefan Boltzmann constant  with value  

      \sigma  =  5.67 *10^{-8} \  W/m^2\cdot K^4

So

     A =  \frac{200}{0.350 *  5.67*10^{-8} *  2450^{4}}

     A =  2.80 *10^{-4} \  m^2

8 0
3 years ago
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