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3 years ago

14

In Ursula’s model, the yellow straw represents the ____ (phloem, xylem, roots, or leaves) and the red striped straw represents t

he ____. (Roots, leaves, xylem, or phloem)

1 answer:

kvv77 [185]3 years ago

5 0

The first options answer is phloem while the second answer is roots

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How are species introduced to new ecosystems? Check all that apply. carried in on cargo crates transported in or on ships result

Bumek [7]

Ever one but the third and last option on edgenuit

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2 years ago

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xxMikexx [17]

Answer:

Sugars and phosphates

Explanation:

DNA is deoxyribonucleic acid.

The backbone is based on a repeated pattern of a sugar group (deoxyribose) and a phosphate group.

The image below shows one straightened-out strand of DNA with a backbone of alternating sugars and phosphates.

A is wrong. There is no ribose in DNA.

B is wrong. The nucleic acids A, C, G, and T join one strand of DNA to the other.

C is wrong. There is no RNA in DNA.

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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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