Quiz 1
Which of the following is not a chemical change?
a rock being crushed to powder
Is aging primarily an example of a physical or chemical change?
aging is an example of a chemical change involving the chemical reformation of our biomolecules
Turns into a white powder when heated in the presence of oxygen is a ____ change
chemical
Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder.
chemical; physical; chemical; physical
Which of the following would be considered a physical property?
density
Which of the following is an example of a chemical change?
gasoline being used in the engine of a car producing exhaust
The phase in which atoms and molecules no longer move is the
none of the above
A solid is not considered fluid because
of the fixed arrangement of its atoms or molecules
Can be made into thin sheets
physical
Conducts electricity is a ____ property
physical
Turns into a silvery liquid when heated in the absence of oxygen
physical
Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this?
physical change
Which of the following would be considered a chemical property?
reactivity towards water
Which of the following would not be considered a physical property?
temperature at which a material catches on fire
What chemical change occurs when a wax candle burns?
the heated wax molecules combine with oxygen molecules
Which of the following would not be considered a chemical property?
the temperature at which a liquid will boil
Gases are so much easier to squeeze into smaller volumes than liquids or solids because
there is so much space in between the submicroscopic particles
Which of the following is an example of a physical change?
water boiling and being converted into steam