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sweet [91]
3 years ago
14

In which reaction would the activation energy result in an endothermic reaction?

Chemistry
2 answers:
miv72 [106K]3 years ago
7 0

Answer : The correct option is, An egg cooking

Explanation :

  • Endothermic reaction : It is a type of chemical reaction in which the energy is absorbed from the surrounding.
  • Exothermic reaction : It is a type of chemical reaction in which the energy is released into the surrounding.

Water freezing  : It is an exothermic process. In this process, the heat is released when the phase changes from the liquid state to solid state.

An egg cooking  : It is an endothermic process. In this process, the heat is absorbed when the phase changes from the solid state to liquid state.

A candle burning : It is an exothermic process because the more amount of  heat is released when candle burns.

Iron rusting : It is an exothermic process because heat is released during the iron rusting process.

Hence, an egg cooking  is an endothermic reaction.

egoroff_w [7]3 years ago
3 0

Just did the test.

Answer is "An egg cooking".

I thought it was a candle burning because it keeps going until the light goes out but was wrong :( lol.

Hope this helps!

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If an electromagnetic wave has a frequency of 4.5 x 10^18 Hz, what is its wavelength? The speed of light is 3 x 108 m/s.
Mekhanik [1.2K]

Answer:

Wavelength, λ  = 6.7 x 10^-11 m

Explanation:

Frequency and wavelength are inversely proportional to each other.

In this problem;

f =  4.5 x 10^18 Hz

wavelength, λ = ?

Speed of light, c = 3 x 108 m/s.

These variables are related by the following equation;

c = λ * f

Making λ subject of focus, we have;

λ = c / f

λ = 3 x 10^8 / 4.5 x 10^18

λ  = 0.67 x 10^-10

λ  = 6.7 x 10^-11 m

3 0
3 years ago
A piece of unknown metal weighs 348g. When the metal piece absorbs 6.64kj of heat , its temperature increases from 24.4C to 43.6
Morgarella [4.7K]

Answer:

This metal could be the aluminium with a specific heat of H = 993 \frac{J}{kgC}

Explanation:

A pie of unknown metal presents a mass (M) of 348 g. This metal is heated using energy (E) of 6.64 kJ and the temperature increases from T1 =24.4 to T2 =43.6°C. We can calculate the specific heat (H) of this metal as follows

H = \frac{E}{M*(T2-T1)}

We can replace previously presented data in this equation. After simplifying and converting to adequated units, we found that

H = \frac{6640 J}{0.348 Kg*(43.6-24.4) C} =\frac{6640 J}{6.686 KgC}

Finally, the specific heat of this metal is

H = 993 \frac{J}{kgC}

The aluminium could be the metal, its specific heat is similar to that found in this problem.

Finally,  we can conclude that this metal could be the aluminium with a specific heat of H = 993 \frac{J}{kgC}

7 0
3 years ago
Which radioisotopes have the same decay mode and have half-lives greater than
AveGali [126]

The correct answer is (3)


I-131 and P-32


The explanation:


according to attached table:


- we can see that the half life of p 32 is 14.28d (more than one hour)

- and the half life of I-131 is 8.021 d (more than one hour)


and They both have β- decay mode and with half-lives greater than hour.


4 0
4 years ago
Read 2 more answers
How many grams are in 6.00 moles of NaCl?
Anastasy [175]

Is it 350.4, I assume?

5 0
3 years ago
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2HgO O2 + 2Hg
stepladder [879]

Answer:

33.5 grams of oxygen will be produced

Explanation:

7 0
2 years ago
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