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4 years ago

How does changing the surface area increase the reaction rate of a chemical change

1 answer:

6 0

Effect of increasing surface area on the rate of a reaction. ... Increasing the surface area of a solid reactant exposes more of its particles to attack. This results in an increased chance of collisions between reactant particles, so there are more collisions in any given time and the rate of reaction increases.

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Consider the following intermediate chemical equations.

geniusboy [140]

<u>Answer:</u> The enthalpy of the overall chemical equation is -205.7 kJ

<u>Explanation:</u>

Hess's law is defined as the law which states that the total amount of heat absorbed or released for a given chemical reaction will remain the same whether the process occurs in one step or several steps.

In this law, a chemical equation is treated as an ordinary algebraic expression that can be added or subtracted to yield the required overall equation.

The enthalpy change or heat of the overall reaction is the summation of the enthalpies or heats of the intermediate reactions involved in the process.

The given overall chemical equation follows:

$CH_4(g)+4Cl_2(g)\rightarrow CCl_4(g)+4HCl(g);\Delta H^o_{rxn}$

The intermediate equations for the above reaction are:

(1) $CH_4(g)\rightarrow C(s)+2H_2(g);\Delta H_1=74.6 kJ$

(2) $CCl_4(g)\rightarrow C(s)+2Cl_2(g);\Delta H_2=95.7kJ$

(3) $H_2(g)+Cl_2(g)\rightarrow 2HCl(g);\Delta H_3=-92.3kJ$

According to Hess law, the enthalpy of the reaction becomes:

$\Delta H^o_{rxn}=[1\times (\Delta H_1)] + [1\times (-\Delta H_2)] + [2\times (\Delta H_3)]$

Putting values in above expression, we get:

$\Delta H^o_{rxn}=[1\times (74.6)] + [1\times (-95.7)] + [2\times (-92.3)]\\\\\Delta H^o_{rxn}=-205.7kJ$

Hence, the enthalpy of the overall chemical equation is -205.7 kJ

8 0

3 years ago

Which is a waste product of aerobic respiration? A. water B. energy C. oxygen D. glucose

Svetradugi [14.3K]

Answer: A

Explanation:

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4 years ago

What does it mean if data are reproducible but not accurate?

egoroff_w [7]

If data results a reproducible but not accurate, it means that there was a high level of precision, but not complete accuracy.

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4 years ago

Read 2 more answers

What forms white light?

leva [86]

Answer:

Combination of all the wavelengths of visible light.

Explanation:

Hope it helps you :))))

Have a good day

6 0

2 years ago

Which of the following statements is true regarding bacteria and animal cells?

Fantom [35]

The most accurate answer is A.

Bacterial cells are generally very small, almost 10 times smaller than most animal and plant cells. Most bacterial cells measure about 0.2 to 10 microns or micrometers which in inches is 0.0000079 to 0.00039.

One of the reasons that bacterial cells are so small is that they require a large surface area to volume ratio to be able to take in nutrients. They take in nutrients from their surroundings through the process of diffusion.

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4 years ago