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Damm [24]
3 years ago
7

Explain the benefits associated with wearing a mask.

Chemistry
2 answers:
lara [203]3 years ago
6 0
Masks are a simple barrier to help prevent your respiratory droplets from reaching others. Studies show that masks reduce the spray of droplets when worn over the nose and mouth. You should wear a mask, even if you do not feel sick.
goldfiish [28.3K]3 years ago
3 0
Slowing the spread of the virus.
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Francis is learning about dissolving at school. She reads descriptions about the rate of dissolving from four of her friends.
Naddika [18.5K]

Answer:

I personally think Manuel

Explanation:

7 0
3 years ago
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What is the meant by atomic radius
krek1111 [17]

Atomic radius defines the size of an atom.  

Explanation:

Atomic radius is defined as “one-half the distance between the nuclei of two identical atoms that are bonded together.” If ‘r’ is the atomic radius and ‘d’ the distance in between nuclei of two atoms that are identical and bonded, then r = d/2.

The units used to express atomic radius are picometer, nanometer, and Angstroms.

In the periodic table, the atomic radius of elements decreases with elements across a <em>period</em> (left-right) and increases with elements down a group.

8 0
3 years ago
Which of the following numbers will produce the same number when rounded to two significant figures? (2.3)
prohojiy [21]
2.10

The 0 after 1 is not significant and does not affect the value of the number; therefore, when the number will be rounded to two significant figures, it will become 2.1, so it will be the same.
8 0
3 years ago
Which of the following is a homogeneous mixture?
Gala2k [10]

Answer:

Water and applesauce are examples of a Homogeneous Mixture

Chicken Noodle Soup and Soil with Water would be examples of a Heterogeneous Mixture.

Explanation:

Homogeneous Mixtures are mixtures that are the same throughout, i.e. it's just one substance. A good example of this is a glass of water, this is because it is all one solution <u><em>without any other visible</em></u><u> </u><u><em>different parts</em></u><em> </em>that will settle if left alone for a while. The same applies to the applesauce, it is one type of a mixture with nothing else added to it.

Hetergeneous Mixtures on the other hand <u><em>are different substances </em></u>added together. The noodles, soup and chicken, three different substances in one mixture. The soil and water mixture also applies, two substances which separate if left alone.  

See http://chemistry.elmhurst.edu/vchembook/106Amixture.html#:~:text=A%20homogeneous%20mixture%20has%20the,gas%2C%20liquid%2C%20and%20solid. For more information.

5 0
4 years ago
The volume of a bubble that starts at the bottom of a lake at 4.55°C increases by a factor of 8.00 as it rises to the surface wh
Masja [62]

Answer:

The depth of the lake is 67.164 meters.

Explanation:

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas in bubble= ?

P_2 = final pressure of gas = 0.980 atm

V_1 = initial volume of gas = V

V_2 = final volume of gas = 8.00 × V

T_1 = initial temperature of gas = 4.55^oC=273.15+4.55=277.7 K

T_2 = final temperature of gas = 18.05^oC=273.15+18.05=291.2 K

Now put all the given values in the above equation, we get:

\frac{P_1\times V}{277.7 K}=\frac{0.980 atm\times 8.00\times V}{291.2 K}

P_1=7.476 atm

pressure of the gas in bubble initially is equal to the sum of final pressure and pressure exerted by water at depth h.

P_1=P_2+h\rho\times g

Where :

\rho = density of water = 1.00 g /cm^3=1000 g/m^3

g = acceleration due gravity = 9.8 m/s^2

7.476 atm=0.980 atm +h\rho\times g

6.496 atm=h\rho\times g

6.496 \times 101325 Pa=h\1000 g/m^3\times 9.8 m/s^2

h = 67.164 m

The depth of the lake is 67.164 meters.

4 0
4 years ago
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