Which of the following reactions involve both a chemical and physical change? Question 3 options:

CO (g) + 2H2 (g) → CH3OH (l) (methanol formation)

CO (g) + H2O (g) → CO2 (g) + H2 (g) (the water gas shift reaction)

2C2H6O (g) + O2 (g) → 2C2H4O (g) + 2H2O (g) (the oxidation of ethanol to form acetaldehyde—the compound that causes you to feel a “hangover”.)

All of the above.

None of the above.

c (diamond),

sio2 (quartz)

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.