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3 years ago

Why pH level test is important in lotion testing? Why it matter? Explain your answer

Chemistry

1 answer:

IceJOKER [234]3 years ago

3 0

Answer: The ph value of the skin plays an essential role in protecting the skin.

Explanation:

An acidic protective layer is crucial for the functioning of the skin's protective barrier. Neutralizes aggressive alkaline substances (eg, aggressive surfactants), inhibits bacterial growth and restores and maintains an optimal acidic environment in which natural flora can develop.

If there is a rise in the ph value of the skin, the nature of the skin may become disturbed. Essential epidermal lipids can no longer be synthesized, so in this case, the skin loses and dries. By breaking its protective function, the skin can become dry, sensitive, or extremely

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Considering the chart shown, at what temperature does the substance boil? 200ºC 1,200ºC 2,200ºC 2,400ºC

kodGreya [7K]

Answer:

The answer is 2,200ºC

Explanation:
I took the assignment for Edge, I don't think I can send the image because it might pick up on that and get reported, sorry!

The only other rationale that I have is that it's boiling because the graph shows that it's at a constant temperature/rate at 2,200ºC for quite a while. Typically when something boils, it stays at that constant rate of boiling, unless you turn the temperature up or it's finally able to peak..?

8 0

3 years ago

Find the number of photons of wavelength = 5.49×10−6 m that must be absorbed to melt 1.00 g of ice.

Misha Larkins [42]

First, we determine the energy required to melt one gram of ice. This is given by:

Energy = mass * latent heat of fusion
Energy = 1 g * 334 J/g
Energy = 334 J

Next, we use Planck's equation which is:

Energy = number of photons * Planck's constant * speed of light / wavelength

334 = n * 6.64 x 10⁻³⁴ * 3 x 10⁸ / 5.49 x 10⁻⁶
n = 9.20 x 10²¹

9.20 x 10²¹ photons need to be absorbed by the ice.

7 0

3 years ago

classify the materials based on their composition rock, clear liquids, peppercoms, concrete, salt, oxygen, birdseed, plant

USPshnik [31]

Answer:

1. rocks are composed of grains of minerals which are formed by the longest natural chemical reaction

2. clear liquids are mainly sugar and water . they are transparent food and mainly are beverages , ice , grains etc stuff

3. concrete is made up of basically three components . water , aggregate ( rock , sand and gravel ) and portland cement .

4. salt consist of NaCl it is made up of sodium and chloride it is also called rock or halite salt

Explanation:

6 0

3 years ago

Draw the products obtained when 3,3,6-trimethylcyclohexene is treated with nbs and irradiated with uv light.

Jlenok [28]

Answer:

See explanation below

Explanation:

First to all, you need to know what is the function of NBS.

N-Bromosuccinimide (NBS) is a brominating and oxidizing agent that is used as source for bromine in radical reactions (for example: allylic brominations) and various electrophilic additions.

In this case, when it's present the light or heat, this agent acts as electrophylic addition, so, instead of going to the double bond, it's going to do an allylic bromination, so the possible products are the following: (See picture)

6 0

3 years ago

Calculate the number of hydrogen atoms in a sample of hydrazine . Be sure your answer has a unit symbol if necessary, and round

gladu [14]

Answer:

$atoms \ H= 9.767x10^{24}atoms$

Explanation:

Hello!

In this case, considering that the mass of hydrazine is missing, we can assume it is 130.0 g (a problem found on ethernet). In such a way, since we need a mass-mole-atoms relationship by which we can compute moles of hydrazine given its molar mass (32.06 g/mol), then the moles of hydrogen considering one mole of hydrazine has four moles of hydrogen and one mole of hydrogen has 6.022x10²³ atoms (Avogadro's number); therefore, we proceed as shown below:

$atoms \ H=130.0gN_2H_4*\frac{1molN_2H_4}{32.06gN_2H_4} *\frac{4molH}{1molN_2H_4} *\frac{6.022x10^{23}atoms}{1molH}\\\\atoms \ H= 9.767x10^{24}atoms$

Notice 130.0 g has four significant figures, therefore the result is displayed with four as well.

Best regards!

7 0

3 years ago