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2 years ago

Can visible light cause damage that leads to skin cancer

Chemistry

1 answer:

11111nata11111 [884]2 years ago

7 0

Visible and infrared light do not cause sunburn and they are not known to directly be a skin cancer risk.

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How many moles of Oxygen atoms are in a sample of 3.98 x 10^23 atoms?

Tatiana [17]

$1mol\ \ \ \ \rightarrow \ \ \ 6,02*10^{23}\\
x \ \ \ \ \ \ \ \ \ \rightarrow \ \ \ 3,98*10^{23}\\\\
x=\frac{3,98*10^{23}*1mol}{6,02*10^{23}}\approx0,66mol$

8 0

2 years ago

Read 2 more answers

A student wants to prepare 1.00 L of a 1.00 M solution of NaOH (molar mass 40.00 g/mol). If solid NaOH is available, how would t

Serga [27]

Explanation:

$Molarity=\frac{\text{Mass of substance}}{\text{Molar mass of substance}\times \text{Volume of solution(L)}}$

Mass of NaOH = m

MOlar mass of NaOH = 40 g/mol

Volume of NaOH solution = 1.00 L

Molarity of the solution= 1.00 M

$1.00 M=\frac{m}{40 g/mol\times 1.00 L}$

$m=1.00 M\times 40 g/mol\times 1.00 L = 40. g$

A student can prepare the solution by dissolving the 40. grams of NaOH in is small volume of water and making that whole volume of solution to volume of 1 L.

Upto two significant figures mass should be determined.

$M_1V_1=M_2V_2$ (dilution equation)

Molarity of the NaOH solution = $M_1=2.00 M$

Volume of the solution = $V_1=?$

Molarity of the NaOH solution after dilution = $M_2=1.00 M$

Volume of NaOH solution after dilution= $V_2=1 L$

$M_1V_1=M_2V_2$

$V_1=\frac{1.00 M\times 1.00 L}{2.00 M}=0.500 L$

A student can prepare NaOH solution of 1.00 M by diluting the 0.500 L of 2.00 M solution of NaOH with water to 1.00 L volume.

Upto three significant figures volume should be determined.

8 0

3 years ago

What word is used to refer to a group of organ systems working together?

kotegsom [21]

Answer:

Explanation:

in my opinion,The answer would be organism

please mark me as brainliest

6 0

2 years ago

The competition between the U.S. and the Soviet Union to get satellites and humans into space was known as the:

Alex787 [66]

Answer: It was known as the SPACE RACE.

Explanation: The space race was a cold war between the Soviet Union (USSR) and the United States (US), to get satellites and humans into space. The competition began in earnest on August 2, 1955, when the Soviet Union responded to the US announcement. On April 12, 1961, the USSR surprised the world again by launching Yuri Gagarin into a single orbit around the Earth in a craft they called Vostok 1.

7 0

2 years ago

PLEASE HELP!!!

Kaylis [27]

I think it comes from Fungi. I'm not 100% sure about that though.

8 0

2 years ago