I will give brainliest please help me I dont understand?? 1. You are traveling upward in a hot air balloon. Explain to me what changes as you go through each layer of the atmosphere. Mention things like temperature, pressure, adjustments you will have to make to survive, etc.
2. When discussing gasses, why do you have to include temperature, pressure, and volume of the sample?
3. Why do they say that steam burns are more dangerous than being burned by boiling water?
4. Why will it take longer to boil pasta on the top of a mountain than at sea level?
5. Helium is lighter than air. Explain the difference.
6. What is it usually warmer upstairs than downstairs?​

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

a

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.