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3 years ago

What is chemical reaction ??

Chemistry

2 answers:

vitfil [10]3 years ago

7 0

Answer:

A chemical reaction involves, breaking and making of bonds between reactants to give rise to formation of new products. A chemical reaction is basically rearrangement of atoms.

sweet [91]3 years ago

6 0

By definition, chemical reactions are those that cause the chemical bonds between atoms to break and reorganize, giving rise to different substances.

<h3>Substances present in a chemical reaction</h3>

In a chemical reaction there are the substances that react, that is, the reactants, and the substances produced, called products.

<h3>Mass of a chemical reaction</h3>

The mass of the participating substances is the same before and after the reaction, that is, it is conserved. This happens because only a rearrangement takes place between the atoms of the reactants, which break and form new bonds.

<h3>Energy necessary of a chemical reaction</h3>

It must be taken into account that for a chemical reaction to occur the reactants must collide since energy is necessary to break the chemical bonds between atoms.

<h3>Summary</h3>

In summary, chemical reaction is the way one substance reacts against another. In this way, the chemical bonds between atoms are broken and new bonds are formed.

Learn more about chemical reaction:

<u>brainly.com/question/3461108?referrer=searchResults</u>

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Calculate the standard reaction enthalpy for the reaction NO2(g) → NO(g) + O(g) given +142.7 kJ/mol for the standard enthalpy of

bulgar [2K]

Answer:

The standard reaction enthalpy for the given reaction is 235.15 kJ/mol.

Explanation:

$O_2(g) \rightarrow \frac{2}{3}O_3(g),\Delta H^o_{1}=142.7 kJ/mol$ ..[1]

$O_2(g) \rightarrow 2 O(g),\Delta H^o_{2}=498.4 kJ/mol$ ..[2]

$NO(g) + O_3(g)\rightarrow NO_2(g) + O_2(g) ,\Delta H^o_{3} = -200 kJ/mol$ ..[3]

$NO_2(g)\rightarrow NO(g) + O(g),\Delta H^o_{4}=?$ ..[4]

Using Hess's law:

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

2 × [4] = [2]- (3 ) × [1] - (2) × [3]

$2\times \Delta H^o_{4}=\Delta H^o_{2} -3\times \Delta H^o_{1}-2\times \Delta H^o_{3}$

$2\times \Delta H^o_{4}=498.4 kJ/mol-3\times 142.7 kJ/mol-2\times -200 kJ/mol$

$2\times \Delta H^o_{4}=470.3 kJ/mol$

$\Delta H^o_{4}=\frac{470.3 kJ/mol}{2}=235.15 kJ/mol$

The standard reaction enthalpy for the given reaction is 235.15 kJ/mol.

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3 years ago

Approximately, how many days does it take for an insect to grow from an egg to an adult?

vlabodo [156]

D.)14 to 16 days ... at least for a fly with is an insect also
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yawa3891 [41]

Answer:

emissions by factories is the answer

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Factories produce air pollution which is polluted air, the other options

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3 years ago

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Sliva [168]

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What is chemical reaction ??​

What is chemical reaction ??