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Sophie [7]
2 years ago
11

13. What is the photon energy associated with visible light with a wavelength of 4.25x10^-7 m?

Chemistry
1 answer:
4vir4ik [10]2 years ago
5 0

\\ \sf\bull\longmapsto E=hv

\\ \sf\bull\longmapsto E=\dfrac{hc}{\lambda}

\\ \sf\bull\longmapsto E=\dfrac{6.626\times 10^{-34}Js\times 3\times 10^8ms^{-1}}{4.25\times 10^{-7}m}

\\ \sf\bull\longmapsto E=\dfrac{19.878\times 10^{-26}Jm}{4.25\times 10^{-7}m}

\\ \sf\bull\longmapsto E=4.677\times 10^{-19}J

\\ \sf\bull\longmapsto E=4677\times 10^{-16}J

\\ \sf\bull\longmapsto E=4677eV

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Agata [3.3K]

Answer:

Final mass = 159.5 g

Final temperature = 10 C

Final density = 1.00 g/ml

Explanation:

<u>Given:</u>

Beaker 1:

Mass of water = 44.3 g

Temperature = 10 C

Beaker 2:

Mass of water = 115.2 g

Temperature = 10 C

Density of water at 10C = 1.00 g/ml

<u>To determine:</u>

The final mass, temperature and density of water

<u>Calculation:</u>

Final\ mass\ of \ water = Beaker\ 1 + Beaker\ 2 = 44.3 + 115.2 = 159.5 g

Since there is no change in temperature, the final temperature will be 10 C

Density of a substance is an intensive property i.e. it is independent of the mass. Hence the density of water will remain constant i.e. 1.00 g/ml

3 0
3 years ago
explain why some metal occur as free element in nature, why other occur in combined states. give two examples of each type
MaRussiya [10]

Explanation:

Thus, those metals which remain unaffected by moisture, oxygen and carbon dioxide of the air can occur native or free. In other words, the unreactive metals occur in nature in free state because of their low reactivity towards chemical reagents. ... Metals usually occur in combination with nonmetallic elements.

3 0
2 years ago
Fill in the blanks.
ANTONII [103]

Answer:GASEOUS, LOWERING ,EMITTED AS HEAT, DOWN,DO NOT RELEASE,DECREASES,NEGATIVE.

Explanation: Filling the blanks gives

Lattice energy is associated with forming a crystalline lattice of alternating cations and anions from the _GASEOUS___________ ions.

Because the cations are positively charged and the anions are negatively charged, there is a LOWERING of potential- as described by Coulomb's law-when the ions come together to form a lattice energy.That energy is EMITTED AS HEAT when the lattice forms.

As the ionic radii increases as you move DOWN a group, ions cannot get as close to each other and therefore DO NOT RELEASE as much energy when the lattice forms. Thus the lattice energy DECREASES (becomes less) NEGATIVE  as the radius increases.

The above gives the  definition of Lattice  Energy and how it relates to atomic and ion charge.

6 0
2 years ago
5. A 25 ml graduated cylinder has a volume of water of 10 ml, when a glass marble is place in the
IceJOKER [234]

Answer:

The volume of the marble is 10 mL.

Explanation:

From the question given above, the following data were obtained:

Volume of water = 10 mL

Rise in water = 10 mL

Volume of marble =.?

From the question given above, the water level rise by 10 mL when a glass marble was placed into the water.

This is equally the volume of the marble as the marble will displace it's volume when placed in the water according to Archimedes' principle.

Therefore,

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4 0
3 years ago
- What is the concentration of hydrogen ions if the pH is 12?
Xelga [282]

Answer:

There are

1.479

×

10

−

13

concentration of hydrogen ions

m

o

l

L

.

Explanation:

Because pH is a logarthmic scale, we can use the formula:

[

H

+

]

=

10

-pH

. Where...

=>

[

H

+

]

is the concentration of hydrogen ions in the solution.

=>

p

H

is the pH of the solution.

=> Where

10

is the base of the power - it's a logarithm formula.

We can now just sub in the values and solve for [

H

+

]

.

[

H

+

]

=

10

-pH

=

10

−

(

12.83

)

=

1.479108388

×

10

−

13

We can round (if required) to

1.479

×

10

−

13

.

Thus, there are

1.479

×

10

−

13

concentration of hydrogen ions

m

o

l

L

.

Hope this helps :)

5 0
2 years ago
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