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Anastaziya [24]
4 years ago
10

Why a raw egg shell disolves when submerge in vineger

Physics
2 answers:
quester [9]4 years ago
6 0
If you soak this egg shell in vinegar (which is about 4% acetic acid), you start a chemical reaction that dissolves the calcium carbonate shell. The acetic acid reacts with the calcium carbonate in the egg shell and releases carbon dioxide gas that you see as bubbles on the shell.
fredd [130]4 years ago
5 0

Because of the acid inside of it.

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The basal metabolic rate is the rate at which energy is produced in the body when a person is at rest. A 75-kg (165-lb) person o
CaHeK987 [17]

Answer:

(a) Q = 142.67 W

(b) Basal Metabolic Rate = 178.33 W

Explanation:

(a)

We can find the heat radiated by the person by using Stefan-Boltzman's law:

Q = \sigma A (T^4 - T_{s}^4)\\

where,

Q = heat radiated per second = ?

σ = Stefan-Boltzman Constant = 5.6703 x 10⁻⁸ W/m².k⁴

A = Surface Area = 2 m²

T = Temperature of Skin = 30° C + 273 = 303 k

Ts = Temperature of room = 18° C +273 = 291 k

Therefore,

Q = (5.6703\ x\ 10^{-8}\ W/m^2.k^4)(2\ m^2)[(303\ k)^4-(291\ k)^4]<u></u>

<u>Q = 142.67 W</u>

<u></u>

(b)

Since the heat calculated in part (a) is 80 percent of basal metabolic rate. Therefore,

Q = (0.8)(Basal\ Metabolic\ Rate)\\Basal\ Metabolic\ Rate = \frac{Q}{0.8}\\\\Basal\ Metabolic\ Rate = \frac{142.67\ W}{0.8}

<u>Basal Metabolic Rate = 178.33 W</u>

5 0
3 years ago
What color will the paper appear? Explain why?
Evgen [1.6K]

Answer:

The answer is B

Explanation:

6 0
3 years ago
Swamps and other wetlands do not offer much value to humans. True or false?
uysha [10]

The statement 'Swamps and other wetlands do not offer much value to humans' is FALSE.

<h3>What are Swamps?</h3>

Swamps and other wetlands are specific ecosystems that are abundant in biodiversity and therefore offer many advantages.

Biodiversity is fundamental to discovering new biotechnological applications and therefore swamps are fundamental for humans.

In conclusion, The statement 'Swamps and other wetlands do not offer much value to humans' is FALSE.

Learn more about swamp diversity here:

brainly.com/question/14619172

#SPJ1

8 0
2 years ago
A model car moves round a circular path of radius 0.3m at 2 revolutions per secs what is its angular speed, the period of the ca
valkas [14]

Answer:

a) T = 0.5 s

b) v = 1.2π m/s ≈ 3.77 m/s

Explanation:

It makes two revolutions in one second so makes one revolution in ½ second

circumference of the circle is

C = 2πr = 0.6π m

which it traverses in one time period

0.6π m / 0.5 s = 1.2π m/s

4 0
3 years ago
What is a primary source?
Mama L [17]

Answer:

Explanation:

B

A primary source is one that is written by the person who lived through an advenure or is one doing the action and recording it.

In this case, the answer is B.

Most frequently, for a historian, a primary source is something like a diary or a bunch of letter written by someone experiencing something.

It cannot be about someone else's work. Not C or D

A textbook is not the answer either. It is a bulky summary of scientific, or other kind of thought.

7 0
3 years ago
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