Question: 1) Which of these investigators did NOT contribute to our knowledge of atoms?

A) Aristotle

B) John Dalton

C) Robert Brown

D) Albert Einstein

Answer: A) Aristotle

Question: 2) Brownian motion is caused by

A) thermal agitation.

B) perpetual motion.

C) particles larger than atoms bumping into them.

D) interactions between atoms and molecules.

E) almost invisible bugs.

Answer: C) Particals larger than atoms bumping into them

Question: 3) What did Robert Brown see in his microscope?

A) straight-line motion

B) circular motions

C) parabolic motions

D) random motions

Answer: D) random motions

Question: 4) Nuclei of atoms that make up a newborn baby were manufactured in

A) the mother’s womb.

B) the food the mother eats before delivery.

C) ancient stars.

D) the Earth.

E) none of the above

Answer: C) ancient stars.

Question: 5) Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are

A) newer.

B) actually older.

C) the same age.

Answer: C) the same age.

Question: 6) A granite block is mostly empty space because the atoms in the granite are

A) in perpetual motion.

B) mostly empty space themselves.

C) held together by electrical forces.

D) not as close together as they could be.

E) invisible.

Answer: B) mostly empty space themselves.

Question: 7) There are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of

A) a large auditorium.

B) a large city.

C) the United States.

D) the whole world.

E) none of the above

Answer: D) the whole world.

Question: 8) Which has the greater density?

A) a cup-full of fresh water

B) a lake-full of fresh water

C) both the same

D) need more information

Answer: C) both the same

Question: 9) Compared to the density of a kilogram of feathers, the density of a kilogram of lead is

A) less.

B) more.

C) the same.

Answer: B) more.

Question: 10) Compared to the volume of a kilogram of feathers, the volume of a kilogram of lead is

A) less.

B) more.

C) the same.

Answer: A) less.