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3 years ago

1. Lines on a global map running parallel to the equator are lines of

Biology

2 answers:

iren2701 [21]3 years ago

7 0

Answer:

Your answer is C) latitude.

babymother [125]3 years ago

7 0

C. latitude. lines of latitude run parallel to the equator, and lines of longitude run parallel to the prime meridian.

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

Radda [10]

Answer:

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

Explanation:

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).

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

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

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

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

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

$=329.48 KJ/mol$

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

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3 years ago

The most abundant element in the atmosphere can also be found in ?

arsen [322]

The most abundant element in the atmosphere can also be is nitrogen since nitrogen gas accounts for about 78% of the atmospheric gases. Beans and whey protein are, of course, high in protein, and a fundamental component of proteins at the molecular level is a nitrogen-containing group called an amine group.

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3 years ago

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The gene that causes sickle cell disease is present in a higher percentage of residents of sub-saharan africa than among those o

Virty [35]

Sickle cell disease has a benefit in malaria infection because it makes the parasites easier to eliminate. This makes a person with sickle cell disease is more likely to survive the malaria infection, which found many in Africa.

Sickle cell disease has a few drawbacks because it makes the red blood cells less durable, which lead to the destruction of more red blood cells. In normal condition(where malaria doesn't exist like in America), this gene will make the organism less likely to survive than those who don't have the gene.

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4 years ago

Tolong di jawab ya.. kalo bisa fotoin aja cara kerjany

nevsk [136]

It is not Biology ☺so it is math

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4 years ago

What are 2 food making processes

Oksana_A [137]

Photosynthesis and chemosynthesis

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4 years ago