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Romashka-Z-Leto [24]
3 years ago
8

During a reaction, thermal energy from the environment is converted into chemical energy stored in the products. Which of the fo

llowing can you determine?
A. The reaction is single replacement.
B. The reaction is exothermic.
C. The reaction is endothermic.
D. The reaction is a decomposition.
Chemistry
2 answers:
JulsSmile [24]3 years ago
6 0

<u>Answer:</u> The correct answer is Option C.

<u>Explanation:</u>

Thermal energy is defined as the energy present in a system which is possessed by the movement of particles present within a system.

Chemical energy is defined as the energy which is present in the bonds forming a chemical compound.

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element.

Exothermic reactions are defined as the reactions in which heat is released.

Endothermic reactions are defined as the reactions in which heat is absorbed.

Decomposition reaction is defined as the reaction in which a single large substance breaks down into two or more smaller substances.

According to the question:

When a chemical reaction takes place, thermal energy is getting converted to chemical energy. This means that energy is being absorbed in a chemical reaction.

Thus, the reaction will be endothermic in nature.

Hence, the correct answer is Option C.

jonny [76]3 years ago
5 0

Answer:

C. The reaction is endothermic.

Explanation:

An endothermic reaction is a reaction that requires or absorbs energy to take place. This reaction is endothermic because it absorbs thermal energy from the environment.

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For this reaction, C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ. If two moles of C3H8(g) reacted with excess oxygen,
algol13
<span> 1C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ

1mol </span>C3H8(g) ---- –2200 kJ
2mol C3H8(g)  ----2(–2200 kJ)=-4400kJ
4 0
3 years ago
Find the standard enthalpy of formation of ethylene, C2H4(g), given the following data: C2H4(g) + 3 O2(g) --&gt; 2CO2(g) + 2 H2O
Brums [2.3K]

Answer : The standard enthalpy of formation of ethylene is, 52.4 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The formation reaction of C_2H_4 will be,

2C(s)+2H_2(g)\rightarrow C_2H_4(g)    \Delta H_{formation}=?

The intermediate balanced chemical reaction will be,

(1) C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)     \Delta H_1=-1411kJ

(2) C(s)+O_2(g)\rightarrow CO_2(g)    \Delta H_2=-393.5kJ

(3) H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(l)    \Delta H_3=-285.8kJ

Now we will reverse the reaction 1, multiply reaction 2 and 3 by 2 then adding all the equation, we get :

(1) 2CO_2(g)+2H_2O(l)\rightarrow C_2H_4(g)+3O_2(g)     \Delta H_1=+1411kJ

(2) 2C(s)+2O_2(g)\rightarrow 2CO_2(g)    \Delta H_2=2\times (-393.5kJ)=-787kJ

(3) 2H_2(g)+2O_2(g)\rightarrow 2H_2O(l)    \Delta H_3=2\times (-285.8kJ)=-571.6kJ

The expression for enthalpy of formation of C_2H_4 will be,

\Delta H_{formation}=\Delta H_1+\Delta H_2+\Delta H_3

\Delta H=(+1411kJ)+(-787kJ)+(-571.6kJ)

\Delta H=52.4kJ

Therefore, the standard enthalpy of formation of ethylene is, 52.4 kJ

7 0
3 years ago
The amount of gravitational force impacts the weight of objects.<br> true or false
ElenaW [278]

Answer:

True

Explanation:

It's how gravity works.

8 0
3 years ago
While preforming an experiment involving colors and heat,Susan noticed that the black paper was warmer than the white piece of p
Firdavs [7]

Answer:

Blackbody radiation

Explanation:

This phenomenon described by Susan is know as black body radiation. Different materials by color reacts to incident radiation on them in diverse manner.

  • A white surface will reflect all the wavelength of light incident on it.
  • A black surface will absorb all the wavelength of light on it.

This absorption causes the black surface to be hotter compared to other surfaces.

3 0
2 years ago
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