<span>density if u in k12 there is page on each test that give u the answer just saying for people in k12</span>
Glass:
transparent, so that we can see through the window
Wooden/plastic handles:
Heat insulator, so that our hands won't get burned if we lift up a hot sauce pan.
Metals for making airplanes:
Low density, so that less fuel is needed
These are just some physical properties, there may be more but these are the most common ones that are specially for the use given.
Bc the number of protons & electrons are the same but the number or neutrons are changed
Answer:
Empirical SiCl3
Molecular Si2Cl6
Explanation:
Since it contains 79.1% chlorine, this means it contains (100 - 79.1)% silicon = 20.9% chlorine
To get the empirical formula, we firstly need to know the atomic masses of both chlorine and silicon. This is 35.5 and 28
We then divide the percentage abundances by the corresponding atomic masses.
Cl = 79.1/35.5 = 2.23
Si = 20.9/28 = 0.75
We then divide by the smallest, which is 0.75
Cl = 2.23/0.75 = 3
Si = 0.75/0.75 = 1
The empirical formula is thus SiCl3
To get the molecular formula:
(28+3(35.5))n = 269
134.5n = 269
n = 269/134.5 = 2
The molecular formula is Si2Cl6
