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3 years ago

Pls help i will mark u

Biology

1 answer:

rewona [7]3 years ago

8 0

Prophase: spindle fibers are developed during this phase.

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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.

3 0

3 years ago

Compare lysosomes and vacuoles to the excretory system. They both ...

slavikrds [6]

Answer:

The lysosome and vacuole are similar to the excretory system. They both store waste and removes waste. The nucleus is similar to the nervous system. The both provide instructions for the functioning of the system. Summary. Cells are highly organized which allows for specialization of each cellular process.

Explanation:

mark as brainliest :)

8 0

3 years ago

Which of the following is NOT true of

stich3 [128]

They aren't all the same is not true of evolutionary trees.

<h3>What are evolutionary trees?</h3>

Evolutionary trees are trees that help to arrange and reconstruct the evolutionary history of species or groups of organisms belonging to either genera, families, or orders. The trees reconstruct and show case two form of information that is related to evolutionary change, cladogenesis and anagenesis.

Therefore, They aren't all the same is not true of evolutionary trees.

Learn more about evolutionary tress here.

brainly.com/question/2189834

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2 years ago

The fine adjustment knob is used to focus an image only on what powers?

mamaluj [8]

It only can focus on high powers

7 0

3 years ago

Read 2 more answers

Known as the _____ vegetables, cabbage, cauliflower, broccoli, and brussels sprouts contain a variety of phytochemicals that def