CHEMISTRY HIGH SCHOOL

What are the variables of Boyle's law?pressure and number of molecules of gas
volume and temperature
pressure and temperature
volume and number of molecules of gas
pressure and volume

Answers

Answer 1
Answer: Boyles law is P1V1=P2V2 where P is pressure and V is volume so the answer is pressure and volume

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What most likely to the inclusion of these elements in the periodic table

Answers

New technology showed how to identify one of the elements

element x has an electron configuration of 1s²2s²2p⁶3s¹, while element z has an electron configuration of 1s²2s²2p⁵. a) which element would have greater first ionization energy? b) which element would have a larger radius? c) which element would have higher electronegativity? d) which element would form an ion that has a larger radius? e) which element would release more energy when it gains an electron?

Answers

Answer:

a) Element Z will have a greater ionisation energy because it's outer electron is in a sub-shell closer to it's nucleus

b) Element X

c) Element z is fluorine which has the highest electronegativity of all elements so it's z

d)Element X

e) I would guess X but im not sure

Who was the first governor of the Massachusetts Bay Colony?A)
John Smith

B)
John Winthrop

C)
Thomas Dale

D)
William Bradford

Answers

Answer: John winthrop

Explanation:

Which of the following atoms has the same number of neutrons as 19F?a. 16O
b. 18F
c. 20Ne
d. 23Na

Answers

C. 20Ne

19F has 19-9=10 neutrons

Ne=20-10=10 neutrons

The data listed below are for mechanical waves. Which wave has the greatest energy? amplitude = 7 cm; wavelength = 12 cm; period = 14 seconds amplitude =12 cm; wavelength = 14 cm; period = 7 seconds amplitude = 14 cm; wavelength = 7 cm; period = 12 seconds

Answers

Explanation :

The amplitude, wavelength and time period of three waves are given.

We know that energy of a wave is given by :

E=(h\ c)/(\lambda)

It is clear that energy of a wave is inversely proportional to the wavelength i.e E\propto (1)/(\lambda)

So, the wave having less wavelength will have the greatest energy.

Also, we know that energy of a wave is directly proportional to the square of amplitude i.e. E\propto(Amplitude)^2

So, again the wave having maximum amplitude will have maximum energy.

Hence, the correct option is (C) i.e. "amplitude = 14 cm; wavelength = 7 cm; period = 12 seconds".

The equation for the energy of a wave is given by the equation of E = A^2 where E is the energy of the wave and A is the amplitude. The higher the amplitude, the greater the energy of the wave is and vice versa. An amplitude of 14cm has the greatest energy of the wave followed by 12cm and then 7cm.

The radioisotope radon-222 has half-life of 3.8 days. how much of a 73.9-g sample of radon-222 would be left after approximately 23 days?

Answers

This can be solved by the equation: 

A = Aoe^(-ln2/t)T
where Ao is the initial amount of the substance ( 73.9-g sample of radon-222 ), t is the half-life time (3.8 days) and T is the time elapsed. Plugging in the values in the equation, the substance left is 1.11g. 
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