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Savatey [412]
3 years ago
12

Which best describes a compound?

Chemistry
1 answer:
Volgvan3 years ago
4 0

Answer: A elements that are chemically combined

It´s the right answer i learn it already

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Determine the frequency of radiation whose wavelength is 7.67 x 10^-7 cm. Then, determine the amount of energy in the radiation.
dimulka [17.4K]

Answer:

They frequency = 3.9 * 10^16 Hz

The amount of energy E = 2.58 *10^-17 J

Explanation:

Step 1: Data given

wavelength is 7.67 * 10^-7 cm

Step 2: Calculate the frequency

f = c / λ

⇒ with  λ = the wavelength in nm = 7.67 nm

⇒ with c = the speed of light  = 3.00 * 10^8 m/s

⇒ f = the frequency = TO BE DETERMINED

f = (3.00 * 10^8 m/s) / 7.67 * 10^-9 m

f = 3.9 * 10 ^16 /s = 3.9 * 10^16 Hz

They frequency is 3.9 * 10^16 Hz

Step 3: Calculate the amount of energy

E  =  h *f

⇒ with E = the amount of energy (in joule)

⇒ h = Planck's constant =  6.626  *10^-34 J*s

⇒ with f = the frequency

E =  6.626  *10^-34 J*s * 3.9 * 10^16 Hz

E = 2.58 *10^-17 J

8 0
3 years ago
a container holds 7.4 moles of gas hydrogen gas makes up 25% of the total moles in the container if the pressure is 1.24 atm wha
Tema [17]
This question is based on Dalton's Law of Partial Pressure which states that "the total pressure of a system of gas is equal to the sum of the pressure of each individual gas (partial pressure).

Now, Partial Pressure of a gas = (mole fraction) × (total pressure)

⇒ Partial Pressure of Hydrogen = \frac{1}{4}   ×   \frac{1.24}{1}
                  
                                                     =   0.31 atm

        Thus the Partial Pressure of Hydrogen in the container is 0.31 atm.
6 0
3 years ago
PLS HELP
Juli2301 [7.4K]

Answer:

False

Explanation:

Water molecules are spread up but slightly, enough that none of the molecules actually move freely around each other. Only gas and plasma molecules are very spread apart.

7 0
2 years ago
How does the corona of the Sun affect earth
SIZIF [17.4K]

Answer:

I don't think it does affect Earth

Explanation:

The sun is too far away to get corona let alone spread it.

6 0
3 years ago
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How do I cook eggs? Please tell me
svetoff [14.1K]
You just throw them on the pan with the flame all the way up it will be done in a second !
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2 years ago
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