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3 years ago

Which of the following is made of cells?

Biology

2 answers:

7nadin3 [17]3 years ago

6 0

The answer is D. Leaf because it is made up of plant cells

zlopas [31]3 years ago

5 0

The answer is D because a leaf is made of cells

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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

Which statement concerning ATP and activity within the cell is correct?

Yuri [45]

Answer:

ATP is produced most efficiently by structure C.(mitochondria)

8 0

2 years ago

How many biosynthetic families are know for amino acid biosynthesis.

lana [24]

Answer:

There are six of them, based on the common compound that they are synthesized

Explanation:

The family of L- glutamate come from the cetoglutarate compound from the Kreps cycle. The family of L-serine, come from 3 - phosphoglicerate compound from the glucolisis. The L - aspartate family, that come from oxaloacetate compound, from the Krebs cylce. The piruvate family that come from the piruvate, from the glucolisis. The aromatic aminoacids, that come from eritrose - 4 - phosphate, from the pentose cycle. And the L histidine family, that come from the ATP.

3 0

3 years ago

Please please help please

Nikitich [7]

Both A and B are true

3 0

3 years ago

Read 2 more answers

A polar covalent bond is a bond between

Assoli18 [71]

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