Hi ! Could someone help me out with this last part to my chemistry practice ? Thank you !

Answers

Answer 1

Answer:

After 100years, sample is 250g

After 200 years, sample is 125g

After 300years, sample is 62.5 g

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when the pressure that a gas exerts on a sealed container changes from 3.74 atm to ____ atm, the temperature changes from 394 K to 789 K

Answers

Gay-Lussacs law gives the relationship between pressure and temperature of a gas.
It states that pressure of gas is directly proportional to the temperature at constant volume.
P/T = k
Where k - constant
P1/T1 = P2/T2
Where parameters for the first instance are on the left side and parameters for the second instance on the right side of the equation.
3.74 atm /394 K = P/789 K
P = 7.49 atm

Answer:

7.49 atm

Explanation:

What is the symbol of the element that is classified as an alkali metal and is in period 4?

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Answer:

Potassium (K) [First element in period 4]

Salt, sugar, and snow are examples of ____________________ solids.

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Crystalline I hope this helps:)

They are examples of Semi solids

Please ignore my answers because they are wrong.

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Answer:

The wavelength of the radio wave is 3.003 m.

The energy of the radio wave is $6.6194* 10^(-26) J$ .

Explanation:

Frequency of the radio waves, ν = 99.9 MHz = $99.9* 10^6 Hz$

Wavelength and frequency are related to each other by realtion:

$\lambda =(c)/(\nu )$

$\lambda$ = Wavelength of the wave

c = speed of the light

ν = Frequency of the wave

$\lambda =(3* 10^8 m/s)/(99.9* 10^6 s^(-1))=3.003 m$

The wavelength of the radio wave is 3.003 m.

The energy of the electromagnetic wave is given by Planck's equation:

$E=h* \nu$

h = Planck's constant = $6.626* 10^(-34) Js$

The energy of the radio wave with 99.9 MHz frequency will be:

$E=6.626* 10^(-34) Js* 99.9* 10^6 s^(-1)$

$E = 6.6194* 10^(-26) J$

The energy of the radio wave is $6.6194* 10^(-26) J$ .

The Aurora Borealis or northern light occur when solar flares react with the atmosphere near the north poles. The Aurora give off colred light because electricity is flowing. Which state of matter must the air be in for the Aurora to occur? A) gas B) liquid C) plasma D) solid

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Answer: C) plasma

Natural phenomena characterized by colored lights in the sky, is caused by the interaction of charged particles of energy from the solar wind with the magnetic layer of the earth so we have turbulence and multicolored plasma clouds known as auroras arise.

Answer:

C) plasma

Explanation:

Plasma is the state where electrons are stripped allow these gases to conduct electricity.

What is the mass of ammonium nitrate in 250 mL of a 75% by mass solution (density = 1.725 g/mL)?