A substance was analysed and was found to have a boiling point of 450 °C. At room temperature it is a soft grey solid.
Which temperature could be the melting point of a pure sample of the substance?
А
-12 °C
B
56 °C to 72 °C
с
250 °C to 275 °C
D
142 °C

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀ pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4. 0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.

Areader can tell that the meaning of “obnoxious” will include “having the quality of something” because of the .a) prefix b)pronunciation c)suffix d) word root