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3 years ago

In the female reproductive cycle menstrual flow occurs when the concentrations of

Biology

1 answer:

olga nikolaevna [1]3 years ago

8 0

.....estrogen and progesterone are low

In women, menstrual flow occurs as a result of the actions of some hormone between the pituitary gland in the brain and the ovaries. Female sex hormones prepare the body for fertilization every month and without fertilization there is menstrual flow. Menstruation is activated by reduced levels of the hormones estrogen and progesterone at the end of the previous menstrual flow.

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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 nitrogen bases are complementary to each other

storchak [24]

Answer:

Adenine and guanine are purines, while thymine, cytosine and uracil are pyrimidines.

Hope this helps! Sorry no one answered your question sooner :(

7 0

3 years ago

Marital homogamy tends to occur in the choice of marriage partners because of

ohaa [14]

Had to look for the options and here is my answer. The answer that fits the blank is SPATIAL NEARNESS. When we say spatial nearness, this refers to small distance or closeness and marital homogamy becomes a choice in marriage. Marital homogamy refers to the relationship wherein someone marries another who are of the same sociological status.

3 0

3 years ago

Why does net productivity diminish with increasing trophic levels??

geniusboy [140]

Due to the bad trophic efficiency transfer, there is a loss in the consumption of most energy to cellular respiration at trophic levels. It also loses energy to heat, metabolism and other subsistence for biomass production. There is a higher energy loss when it is at higher trophic levels.

4 0

3 years ago

Which examples from the list below are considered Biotic factors?

ddd [48]

Biotic factors may include things like:
-predation
-disease
-competition
-parasitism
-consumption
and -symbiosis

Hope this helps then!! :)

5 0

3 years ago