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IrinaK [193]
3 years ago
7

Don't answer if you're not 100%.

Chemistry
1 answer:
Ilia_Sergeevich [38]3 years ago
3 0
<span>Answer: has only one identity

Compounds like water (H2O) has 2 kinds of atoms which are hydrogen and oxygen. They also have a chemical bond and their bond is not able to be separated by physical means. It different with a mixture of water with sugar. The water and sugar are two different molecules but they don't bind each other. If you evaporate the water, the sugar will remains so it </span>can be separated by physical means.<span>.</span>
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An electron in the n = 3 energy level of the hydrogen atom emits a photon with wavelength 656.27 nm. What is the change in energ
Lady_Fox [76]

Answer:change in energy of the electron=3.052x 10^-19J

which energy level does it move= level 2 , n=2

Explanation:

Using the formulae

1/λ = R (1/n1²- 1/n2²)

Where λ= 656.27 nm

1 nm = 1 x 10^-9 m

656.27 nm = 656.27 x 1 x 10^-9 =6.5726 x 10^-7

R =Rydberg constant = 1.0967 x 10^7m-1

1/λ = R (1/n1²- 1/n2²)

1/6.5726 x 10^-7=1.0967 x 10^7(1/n1²- 1/3²)

1/n1²=(1/6.5726 x 10^-7 x   1/1.0967 x 10^7) + 1/9

1/n1²=1,521,467.9 x 9.118x10^-8 + 0.1111

1/n1² =0.2498

n1²= 1/0.2498 =4

n1= \sqrt{4} = 2

it moves to energy level 2

b) Change in energy =ΔE = Rhc (1/n1²- 1/n2²)

Where R==Rydberg constant = 1.0967 x 10^7m-1

h = Planck constant = 6.626x 10^-34js

c = speed of light = 3.0 x 10^8 x m/s

ΔE = Rhc (1/n1²- 1/n2²)

=1.0967 x 10^7m-1 x6.626x 10^-34js X 3.0 x 10^8 x m/s (1/2² - 1/3²)

=2.18 x 10-18 x ( 1 /4 - 1/9)

=3.052x 10^-19J

7 0
3 years ago
HELP HELP HELP !!!!!!!!!!!!!!
zhuklara [117]

Answer:

approximately 83.33

Explanation:

The formula for the area of a right square pyramid is:

V= a^2(h/3)

a= base edge

h= height

The height is 10 inches, and the base edge is 5 inches. Plug it in to the formula:

V= 5^2 (10/3)

V= 25 (10/3)

V= 83.33 in^3

5 0
2 years ago
Find the density of a liquid with a volume of 3.8 mL and a mass of 3.75 g
d1i1m1o1n [39]

Answer:

The answer is

<h2>0.99 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

<h3>density =  \frac{mass}{volume}</h3>

From the question

mass of liquid = 3.75 g

volume = 3.8 mL

Substitute the values into the above formula and solve for the density

The density is

density =  \frac{3.75}{3.8}  \\  = 0.98684210...

We have the final answer as

<h3>0.99 g/mL</h3>

Hope this helps you

5 0
3 years ago
Calculate the standard entropy change for the dimerization of no2: 2 no2(g) → n2o4(g) at 298 k, if s ◦ ∆h◦ f j k·mol kj mol no2(
zhenek [66]
<span>Calculate the standard entropy change for the dimerization of NO2: 2NO2(g)→N2O4(g)at 298 K, if Sâ—¦ â†Hâ—¦f J/K·mol NO2(g) 240.06 33.18 N2O4(g) 304.29 9.16 Answer in units of J/K·mol AP Chemistry - DrBob222 Tuesday, October 29, 2013 at 8:53pm See your other posts below. AP Chemistry - fg Monday, April 4, 2016 at 4:19pm dg4354 2242342 1111 AP Chemistry - Eman Monday, April 25, 2016 at 11:19am -175.8 j/k.mol</span>
4 0
3 years ago
The solubility of a sample will ____________ when the size of the sample increases.
devlian [24]

The solubility of a sample will decrease when the size of the sample increases.

When the Size of sample is bigger, it means there is more particles that make up that sample so the amount of solvent to dissolve the sample will also be in the greater amount. Thus, when the sample size increases the solubility decrease. We can also say that size of sample and solubility are inversely proportional to each other.

8 0
3 years ago
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