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nadezda [96]
3 years ago
5

Reverberation in concert halls is caused by ____. a. diffraction c. diffusion b. refraction d. reflection Please select the best

answer from the choices provided A B C D
Chemistry
1 answer:
Tanya [424]3 years ago
6 0
It's D reflection. I found the answer on quizlet.
https://quizlet.com/127051840/chapter-12-sound-flash-cards/  
That is the link to the quizlet.
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What effect does rapid exhalation of CO2 during exercise have on the concentration of H2CO3 in the blood?
BARSIC [14]

If there is a constant loss of CO_{2}~(carbon~dioxide) the concentration of H_{2} CO_{3}~(carbonic~acid) will be affected and decrease since CO_{2} is a main component of H_{2}CO_{3}.


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BioTeacher101

3 0
3 years ago
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Determine the number of protons and neutrons in plutonium-239 and write its symbol in the form azx.
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2 years ago
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How much heat is required to vaporize 31.5 gg of acetone (C3H6O)(C3H6O) at 25 ∘C∘C? The heat of vaporization for acetone at this
KiRa [710]

Answer:

≅ 16.81 kJ

Explanation:

Given that;

mass of acetone = 31.5 g

molar mass of acetone = 58.08 g/mol

heat of vaporization for acetone = 31.0 kJ/molkJ/mol.

Number of moles = \frac{mass}{molar mass}

Number of moles of acetone = \frac{31.5}{58.08}

Number of moles  of acetone = 0.5424 mole

The heat required to vaporize 31.5 g of acetone can be determined by multiplying the number of moles of acetone with the heat of vaporization of acetone;

Hence;

The heat required to vaporize 31.5 g of acetone = 0.5424 mole × 31.0 kJ/mol

The heat required to vaporize 31.5 g of acetone = 16.8144 kJ

≅ 16.81 kJ

4 0
3 years ago
How many lone pairs are on the central atom of BrF3?
allochka39001 [22]

Answer:

BrF3 has 2 lone pairs (4 unshared electrons)

Explanation:

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