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4 years ago

Zinc oxide helps protect the lifeguards from damaging UV sunlight. How does this cream protect from the UV rays of the Sun?

1 answer:

8 0

It reflects sunlight. It's a physical barrier (in comparison to some sunscreens which are chemical blocks). Sunlight is mostly white light and zinc oxide reflects white light

You might be interested in

How many moles in 110g of nahco3?

kenny6666 [7]

Hope this helps you.

5 0

3 years ago

What is the VSEPR notation for the molecule

Ilya [14]

VSEPR notation gives a general formula for classifying chemical species based on the number of electron pairs around a central atom. However, not all species have the same molecules.

For example, carbon dioxide and surfer dioxide are both species, but one is linear and another one is bent.

4 0

4 years ago

How many mols are present in the a sample of silver nitrate which has<br> 5.3x10^24 molecules.

Westkost [7]

Answer: 5.3 x 10^24 formula units of silver nitrate is equivalent to 8.8 moles of silver nitrate. Silver nitrate is an ionic compound, therefore, its representative particle is called a "formula unit" instead of molecule. For every mole of a substance, we know that there are 6.022 x 10^23 representative units of that substance. The amount of particles in one mole of substance is called Avogadro's number.

Further Explanation:

We can convert from number of representative particles to moles using the formula:

$\boxed {no. \ of \ moles \ = \ ( given \ no. \ of \ particles) \ (\frac{1 \ mole}{\ 6.022 \ x 10^{23} particles})}$

For this problem, we can calculate the number of moles by plugging in the given values to the equation above,

$no. \ of \ moles \ = (5.3 \ x \ 10^{24} \ formula \ units \ AgNO_{3}) \ (\frac{1 \ mole \ AgNO_{3}}{6.022 \ x 10^{23} \ formula \ units AgNO_{3}}) \\\\\boxed {no. \ of moles \ AgNO_{3} \ = \ 8.8 \ moles}$

Learn More

Learn more about representative particles brainly.com/question/8969313
Learn more about Avogadro's number brainly.com/question/229300
Learn more about mole conversions brainly.com/question/1370888

Keywords: moles conversion, Avogadro's number

5 0

3 years ago

Can anyone help with this? please

Sloan [31]

Answer:

Volume of solution = 80.5 mL

Explanation:

Given data:

Molarity of solution = 4.50 mol/L

Mass of ethanol = 16.7 g

Volume of solution = ?

Solution:

Volume will be calculated from molarity formula.

Molarity = number of moles / volume in L

Number of moles:

Number of moles = mass/molar mass

Number of moles = 16.7 g/ 46.07 g/mol

Number of moles = 0.3625 mol

Volume of solution:

Molarity = number of moles / volume in L

4.50 mol/L = 0.3625 mol / volume in L

Volume in L = 0.3625 mol /4.50 mol/L

Volume in L = 0.0805 L

Volume in mL:

0.0805 L ×1000 mL/1 L

80.5 mL

3 0

3 years ago

Explain the connection between stereotypes and self-fulfilling prophecy. Give an example of how this works.

Darya [45]

Explanation:

Self fulfilling prophecy means how our expectations or expectations of others influence our own behavior. Being self fulfilling means, to bring about a result that has been already foretold or talked about.

Whereas Stereotype is a preconceived notion about a particular type of person or thing. for examples woman as driver are not so good is an stereotype. However, the idea may untrue or partly true.

6 0

3 years ago