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3 years ago

What event gave Darwin the idea for his theory of Evolution?

Biology

1 answer:

Sveta_85 [38]3 years ago

4 0

Answer:the idea that species change over time, give rise to new species, and share a common ancestor.

Explanation:

to better cope with environment

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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 element is capable of forming long chains by forming single, double, or triple bonds with itself?

Mnenie [13.5K]

The element carbon makes long chains forming, single, double or triple bonds with itself.

3 0

3 years ago

Bears are known to hibernate during the winter and give birth to their cubs 1 point

damaskus [11]

Answer:

ufuddsiodpfofiffopOI

Explanation:

3 0

2 years ago

What are the hormones responsible for both male and female characteristics?

Simora [160]

Answer:

The Leydig cells produce testosterone, which also is responsible for the secondary sexual characteristics of males. In females, FSH and LH cause estrogen and progesterone to be produced. They regulate the female reproductive system which is divided into the ovarian cycle and the menstrual cycle.

Explanation:

7 0

2 years ago

Why should we be moral

MrRissso [65]

Being moral helps people to distinguish between good and bad.

A person who lives a moral life has a much easier life. It is easier physically and emotionally to live by the laws and rules. You have peace of mind knowing that you have not intended harm to anyone.

8 0

2 years ago