What is the Big Bang

Answers

Answer 1

Answer: the rapid expansion of matter from a state of extremely high density and temperature that according to current cosmological theories marked the origin of the universe.

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What is the mass of 12.3 moles of helium (He)?

Answers

Answer : The mass of 12.3 moles of helium (He) is, 49.2 grams.

Solution : Given,

Moles of helium = 12.3 moles

Molar mass of helium = 4 g/mole

Formula used :

$\text{Mass of helium}=\text{Moles of helium}* \text{Molar mass of helium}$

$\text{Mass of helium}=(12.3mole)* (4g/mole)=49.2g$

Therefore, the mass of 12.3 moles of helium (He) is, 49.2 grams.

Answer:

C. 49.2 g He

Explanation:

I got it right

What is the name of the body part that passes messagesfrom the sensory neurons to the brain?
o Lungs
O Nerve Cells
o Brain
o Stimulus please help me thanks

Answers

The answer would be nerve cells. Hope that helps you!

Given the balanced equation representing reaction:N2 + energy ==> N + N
Which statement describes this reaction?
( I) Bonds are broken, and the reaction is endothermic.
(2) Bonds are broken , and the reaction is exothermic.
(3) Bonds are formed, and the reaction is endothermic.
(4) Bonds are formed, and the reaction is exothermic.

Answers

Answer: Option (1) is the correct answer.

Explanation:

In a $N_(2)$ molecule, the nitrogen atoms are bonded together by triple bond.

Therefore, in order to break this triple bond high heat or energy has to be provided.

Thus, the reaction $N_(2) + energy \rightarrow N + N$ shows that N triple bond N is broken down as energy is absorbed by $N_(2)$ molecule.

Hence, we can conclude that in the given reaction bonds are broken, and the reaction is endothermic.

( I) Bonds are broken, and the reaction is endothermic.
(2) Bonds are broken , and the reaction is exothermic.
(3) Bonds are formed, and the reaction is endothermic.
(4) Bonds are formed, and the reaction is exothermic.

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