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3 years ago

14

What are two possible outcomes (signs or symptoms) that can result when chemical mediators such as leukotrienes and interleukin-

4 are released in the tissues?

1 answer:

LiRa [457]3 years ago

6 0

It's such a great day to be alive I know the Suns still shinninh when I close my eyes

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3 years ago

Biological significance of pruning

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Imagine that you have found the remnants of a robin's egg on the ground. From your biology course, you know that this eggshell i

amid [387]

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The birds are oviparous in nature and produces eggs that are hatched later by the parent. the egg hatching require proper heat and protection from the external enemy.

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3 years ago

How is enthalpy used to predict whether a reaction is endothermic or exothermic?

Radda [10]

<u>Answer:</u>

<em> $329.48 KJ/mol$ heat is released by the combustion of $2 mol$ of methane</em>

<u>Explanation:</u>

The value of enthalpy determines whether the reaction is exothermic or endothermic. If the enthalpy change is positive, then the reaction is endothermic (heat or energy released) and if the enthalpy change is negative then the reaction is exothermic (heat or energy absorbed).

$2CH_4(g)+4O_2(g) => 2CO_2(g)+4H_2O(g)$

$\Delta H \ reaction=[ 2(\Delta HfCO_2)+ 4(\Delta HfH_2O)]-[2(\Delta HfCH_4)+4(\Delta HfO_2)]$

= $2 ( -(393.5 KJ)/mol)-[2( -74.6 KJ/mol)+4(-241.82 KJ/mol)]$

$= -787 KJ/mol-[ -149.2 KJ/mol-967.28 KJ/mol]$

$= -787 KJ/mol+1116.48 KJ/mol$

$=329.48 KJ/mol$

<em>In this question, </em><em>the enthalpy of formation</em><em> has positive value and hence the </em><em>reaction is endothermic</em><em> in which the heat is released. </em>

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3 years ago

PLS HELP I WILL GIVE BRAINLIEST FOR FIRST ANSWER!! Which of these structures relies on the circulatory system to transport the c

Alchen [17]

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D. pituitary gland

~+. lil more info .+~

The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic). The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.

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3 years ago