Which process does not involve a chemical change?
A) burning charcoal on the grill
B) digesting food
C) boiling water
D) cleaning the shower with Lime Away
Correct Answer:
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Q2: A(n) _ is a fixed number of
Q17: What is the primary component of an
Q17: A particular sample of air is 2.5%
Q19: The burning of coal produces sulfur dioxide,SO2,a
Q20: Which pollutant is present in air as
Q23: In general,which airborne material is not likely
Q24: Which diagram(s)best represent(s)only diatomic molecules? 
Q25: Which color,as used in the Air Quality
Q26: Which is not a pure substance?
A)helium
B)copper wire
C)air
D)sucrose
Q27: Which is not a single pure substance?
A)copper
B)water
C)brass
D)chlorine
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