Answer:
Not positive but i think its when we burn fossil fuels.
Answer:
D. AX + BY -> AY + BX
Explanation:
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AC +BD
So from given list of reactions option D is correct while others are incorrect.
Other examples:
The reaction between sodium chloride and silver nitrate is double displacement reaction.
NaCl + AgNO₃ → AgCl + NaNO₃
The anion and cations of both reactants exchange. The anion of sodium chloride (Cl⁻) combine with cation of silver nitrate (Ag⁺) and form AgCl. While Anion of silver nitrate combine with cation of sodium chloride and form sodium nitrate.
Both A and D
Because these compunds of reactant and the compounds of the product . The reactant goint to equation
The formula of determining the
value is:

where both the distance are measured from the common origin.
10 % ethyl acetate/ hexane means it has 10 % ethyl acetate and 90 % hexane which are non-polar in nature. Hence, the non-polar compound will travel farther in the TLC plate along with the eluent and the polar compound will travel less as they remain attracted to the polar adsorbent
.
Among 3-decanone and 3-decanol, 3-decanone will have high
as it is non-polar.
Among toluene and benzoic acid, toluene will have high
as it is non-polar.
Among cyclooctane and cyclooctanone, cyclooctane will have high
as it is non-polar.
Copper would be the last to melt because it has the highest melting point!