Answer:
About 25 kPa
Explanation:
Pressure decreases with height above sea level.
The calculation is rather complicated, so I will refer to the figure below.
It shows that the pressure at 10 km is about 25 kPa.
It’s number 3 : decomposition and melting
Answer:
B.
Explanation:
Water expands on freezing and there is more water in the diet drinks than in the other drinks.
The reaction is a synthesis…

… because <em>two substances are combining to make one other substance</em>.

It is also a <em>reduction-oxidation reaction</em> because the <em>oxidation number of Al increases</em> from 0 to +3 and the <em>oxidation number of O</em> decreases from 0 to -2.