5. In order for the reaction Al + HCl → AlCl3 + H, to occur, which of the following must
be true:
A. Al must be above H on the
C. Heat must be supplied to the
activity series
reaction
B. Al must be above Cl on the
D. AlCl, must be a precipitate
activity series
E. None of these

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

the answer is 0.8m.

by: nicholas

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24