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Tomtit [17]
3 years ago
14

How much energy does an X-ray with an 8 nm (8 x 10-9 m) wavelength have?

Chemistry
1 answer:
Vlada [557]3 years ago
8 0

Answer: 2.48×10^-17 J

Explanation:

Given the following :

Wavelength = 8nm (8 x 10^-9 m)

Energy(e) of X-ray =?

Energy=[speed of light(c) × planck's constant (h)] ÷ wavelength

Speed of light = 3×10^8m/s

Planck's constant = 6.626×10^-34 Js

Wavelength = 8 x 10^-9 m

Energy = [(3×10^8) * (6.626×10^-34)] / 8 x 10^-9

Energy = [19.878×10^(8-34)] / 8 x 10^-9

Energy = 2.48475 × 10^(-26+9)

Energy = 2.48×10^-17 J

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What volume of 0.175 m na3po4 solution is necessary to completely react with 95.4 ml of 0.102 m cucl2?
VARVARA [1.3K]

 The  volume  of 0.175 M   Na3PO4   solution    that is necessary  to completely  react  withn   95.4 ml  of  0.102 M  cuCl2  is


<u>calculation</u>

<u>  </u><em> Step 1: </em> write  the equation for reaction

3CuCl2 (aq)  + 2Na3Po4 →  Cu3(PO4)2  + 6 NaCl

Step 2 : find the  moles  of CuCl2

moles  =  molarity  x  volume in liters

 volume in liters  =  95.4  /1000 =0.0954 L

moles  is therefore = 0.0954 L  x  0.102 M= 0.00973 moles


Step : use the mole  ratio to calculate  the  moles of Na3Po4

The mole ratio  of  CuCl2 : Na3PO4  is 3:2  therefore  = 0.00973 x2/3= 0.00649  moles


Step  4 :   find  the volume of  Na3PO4

volume  = moles/molarity

= 0.00649 mole /  0.175=0.037 M

5 0
3 years ago
Question 7<br> 5 pts<br> Which of these describes the<br> property of being a thermal<br> insulator?
allochka39001 [22]

One of the properties of thermal insulators is that it does not conduct heat easily.

<h3>What is thermal insulation?</h3>

The process of reducing heat transfer between objects in thermal contact or a range of radiative influence is known as thermal insulation.

To get lower system thermal conductivity, low thermal conductivity materials are used to create thermal insulations.

In addition to using the right product forms and materials, specially engineered technologies or processes can also be used to provide thermal insulation.

<h3>What are the properties of a good thermal insulator?</h3>

The properties that make a good thermal insulator are

Low thermal conductivity

High resistance to heat

Should be made using thermo-insulating materials

High air permeability

Thus, the property of a good thermal insulator is that it doesn't conduct heat easily

Disclaimer: The question was given incomplete on the portal. Here is the complete question

Question: Which of these describes the property of being a thermal insulator?

answer choices

lustrous

does not conduct heat easily

malleable

has a low specific heat capacity

Learn more about insulators:

brainly.com/question/14630058

#SPJ9

8 0
2 years ago
Which of the following best describes hair? O Hair is made of mostly tightly packed living cells Hair does not help control body
Elodia [21]

Answer:

I think its the first one becuase it really descripes

Explanation:

5 0
3 years ago
I also really need help on this one.
Luden [163]

Answer:

I would say ether the first one or the third one because on those questions you always want to choose the one that gives the most information or sound more believe

Hope this helped

4 0
3 years ago
Rank the following substances in order from most soluble in water to least soluble in water: methane, CH4; 2-butanol, C4H9OH; po
nata0808 [166]

Answer:

Arranged in order of most soluble to least soluble in water:

KCl > CH_{4}  > C_{4} H_{9} OH > C_{3}H_{8}

Explanation:

Water is a polar solvent due to the electric charge it possesses. Hence it would only dissolve polar molecules.

Non-polar molecules would be dissolved by non-polar solvents.

Short chain alcohols are more soluble than butanol, but generally the polar -OH group is soluble in water.

3 0
3 years ago
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