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Scorpion4ik [409]
3 years ago
12

NEED IN LESS THEN 10 MINUTES Which statement BEST describes how the loudness of the sound affects the high-pressure region creat

ed by the sound wave? A. A louder sound has no effect on the pressure created. B. A louder sound means a high-pressure region that is higher. C. A louder sound means a high-pressure region that is not as high.
Biology
1 answer:
amm18123 years ago
7 0
I think it’s C if I’m not mistaken
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How is enthalpy used to predict whether a reaction is endothermic or exothermic?
Radda [10]

<u>Answer:</u>

<em>329.48 KJ/mol heat is released by the combustion of 2 molof methane</em>

<u>Explanation:</u>

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

<em>In this question, </em><em>the enthalpy of formation</em><em> has positive value and hence the </em><em>reaction is endothermic</em><em> in which the heat is released. </em>

3 0
3 years ago
Which of the followinf is a reason the residents of montevideo be glad about the reopening of wl observatorio meterorologico del
cestrela7 [59]

Answer:

Meteorological observatory of the Pio College (observatorio meterorologico del colegio pio) was started in the 7 May 1982. This network station mainly covers the area of 30th degree of southern latitude with the tips of Atlantic ocean.

The  montevideo residents are glad about its reopening because this station has the ability to recognize the dangerous storms. The early warning signs are generated about the storms that might affect the near by area of the locality.  

6 0
2 years ago
A bond formed by the electrical attraction between two oppositely charged ions is a(n)_____. covalent bond ionic bond hydrogen b
katrin [286]
Ionic Bond would be the answer.
5 0
3 years ago
Read 2 more answers
If a DNA molecule has 24% adenine, what is the percentage of guanine in the same DNA molecule?
artcher [175]

Answer:

26%

Explanation:

Adenine pairs with thymine.

Guanine pairs with cytosine.

If 24% of the DNA molecule is adenine, that means that there is 24% thymine. This is because they pair together so they have to be equal. That is 48% of the DNA molecule. To find the percentage of guanine, we need to minus 48% from the total 100%.

100 - 48 = 52

Then divide by 2 because you have guanine AND cytosine.

52/2 = 26

Therefore, your final answer is 26% of guanine is in the DNA molecule.

<em>I hope this helps!!</em>

<em>- Kay :)</em>

5 0
2 years ago
Red blood cells are a type of specialized cell that move _______ and carbon dioxide throughout the body.
lidiya [134]

Answer:

Red blood cells are a type of specialized cell that move <u>oxygen </u>and carbon dioxide throughout the body.

A structure made of two or more tissues working together to achieve a common function is a/an <u>an</u><u> </u><u>organ</u><u> </u>

<u>cellular </u><u>defferentiation</u><u> </u>describes the degree of specialization that a cell is able to undergo.

A/An <u>embroynic</u><u> </u>stem cell can differentiate into all cell types found within an embryo.

In <u>cytoplasm</u> organisms, all cellular activities take place within a single cell.

7 0
2 years ago
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