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2 years ago

The best description of the Big Bang Theory is ______________

Chemistry

2 answers:

sergij07 [2.7K]2 years ago

7 0

Answer:

B. the universe began with hot dense energy compressing into matter after which all matter and energy began to rapidly expanding away from each other.

hope it helps

Tema [17]2 years ago

5 0

The answer is the letter “c”

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In chromatography why is it important to remove the strip of paper until it reaches the end

Zielflug [23.3K]

<h3>Answer:</h3>

$\:$

Because the water doesn't have to reach all the way to the top.

6 0

2 years ago

The standard on which the atomic mass unit is based is the mass of a

pashok25 [27]

Answer;

D. carbon-12 atom

Explanation;

-One atomic mass unit is the mass that is exactly equal to one-twelfth the mass of one carbon-12 atom. Therefore, the mass of carbon-12 is 12 amu and this provides the standard that is used in measuring the atomic mass of all other elements.

-The atomic mass of carbon is 12.01 and not 12.00 in the periodic table.

-Due to the fact that there are more than one element for most naturally occurring elements, the average mass of the naturally occurring mixture of isotopes is taken while determining the atomic mass of an element.

3 0

2 years ago

How many moles are in 16.94g of water?

alexira [117]

16.94/18=.9411111

sig figs: 0.9411 mole of water

7 0

3 years ago

Draw the most stable resonance structure for the intermediate in the electrophilic aromatic bromination of aniline, anisole, and

ASHA 777 [7]

Answer:

Here's what I get

Explanation:

(a) Intermediates

The three structures below represent one contributor to the resonance-stabilized intermediate, in which the lone pair electrons on the heteroatom are participating (the + charge on the heteroatoms do not show up very well).

(b) Relative Stabilities

The relative stabilities decrease in the order shown.

N is more basic than O, so NH₂ is the best electron donating group (EDG) and will best stabilize the positive charge in the ring. However, the lone pair electrons on the N in acetanilide are also involved in resonance with the carbonyl group, so they are not as available for stabilization of the ring.

(c) Relative reactivities

The relative reactivities would be

C₆H₅-NH₂ > C₆H₅-OCH₃ > C₆H₅-NHCOCH₃

4 0

3 years ago

6. Which of the following statements correctly describes what happens to the diaphragm during an

Crank

Answer is B.

As the diaphragm contracts and flattens, it increases the volume of the thorax where the lungs are located. This results in a decrease in pressure (Boyle’s Law, if you know it) that creates a pressure gradient from outside to inside. This is what causes air to move into the lungs.

3 0

3 years ago

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