Answer:
1. evaporation of ethanol
2. condensation of ethanol
Explanation:
The first and second process imply a change of phase, which is essentially a physical change because the matter change from liquid to gas and from gas to liquid respectively and it can ve reversed.
The options 3 to 6 are related to a chemical reaction because the outcomes of the process are different compounds than the ones we had at the beginning. The main reaction that implies process 3 to 6 is represented by:
C6H12O6 + impurities → 2 C2H5OH + 2 CO+ C
For option 5. burning of natural gas
, we have:
Natural gas(Mainly a mix of CH4 and C2H10) +O2→COn+H2O
Therefore, justo 1 and 2 are a physical change
Cloud level (ft)Cloud type
High clouds (CH)
Base usually 20,000 ft or above, over British Isles
<span>CirrusCirrocumulusCirrostratus</span>
Medium clouds (CM)
Base usually between 6,500 and 20,000 ft over British Isles.
<span>AltocumulusAltostratusNimbostratus</span>
Low clouds (CL)
Base usually below 6,500 ft over British Isles.
hope this helps!
Divide the 181g by the mol mass of the compound. Just add up the masses of the various elements.
V = 25 x 12 x 13
V = 3900 cm³
Militers:
1 cm³ = 1 mL therefore : 3900 mL
hope this helps!