Author Question: Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; ... (Read 29 times)

erika · **on:** Jul 29, 2018

Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder.

A) chemical; physical; chemical; chemical
B) chemical; physical; physical; physical
C) physical; physical; chemical; physical
D) chemical; physical; chemical; physical

Question 2

Oxygen, Image, is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

A) Yes. This is the reason patients are given pure (100) oxygen during medical procedures.
B) Yes. Increased oxygenation of the bloodstream is good for you and can increase your life span.
C) No. Breathing 100 oxygen for extended periods of time can be damaging to the body.
D) No. Large amounts of oxygen will absorb hydrogen from the body and increase the amount of water in the body causing an imbalance in electrolytes.