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