Answer:
it's 25, just did it
Step-by-step explanation:
1
/2 o
f (
−
10
)
= −
5
, (
−
5
)^
2 = 25
<u>Answer:</u>
a = 8.1
<u>Step-by-step explanation:</u>
Use the cosine rule:
Substituting the values:
⇒ 
⇒ 
You have the answer if you just do a little bit more but other than that you have your answer
Answer:
Because the kind of compounfds that you try to determine using paper chromatography (organic compounds) are usually not soluble in water. Furthermore, water could react chemically with some of this compounds, because it's a very reactive molecule. You need organic solvents that are mostly inert.
