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Classify each change as physical or chemical.a. Sugar bums
Chapter 1, Problem 48E(choose chapter or problem)
Classify each change as physical or chemical.
a. Sugar burns when heated in a skillet.
b. Sugar dissolves in water.
c. A platinum ring becomes dull because of continued abrasion.
d. A silver surface becomes tarnished after exposure to air for a long period of time.
Questions & Answers
QUESTION:
Classify each change as physical or chemical.
a. Sugar burns when heated in a skillet.
b. Sugar dissolves in water.
c. A platinum ring becomes dull because of continued abrasion.
d. A silver surface becomes tarnished after exposure to air for a long period of time.
ANSWER:Solution 48E: Here we have to convert speed of light in vacuum im m/s to miles/h Therefore, the conversion factors required for such unit conversion is given below (i) m to km 1000 m = 1 km 1 km 1 m = 1000m (ii) km to miles 1 mile =1.6093 km 1 miles = 1 miles/1.6093 km (iii) 60 s =1 min 60s/1 min (iv) 60 min = 1 h 60 min/1 h 8 The speed of light in a vacuum is 2.998 * 10 m/s =2.998 * 10 m/s x 1 km x 1 mile x 60s x 60min 1000 m 1.6093 km 1 min 1 h = 6.706 mile/h 8 Thus, The speed of ligh