CHEM FINAL

What led to the discovery of the neutron

Discrepancy between predicted and actual atomic masses

What did the random motion of pollen grains in Robert Brown’s observation unltimately suggest ?

The process of plant reproduction

Which philosphers rejected the early idea of atoms as, indestructible constituents of matter, and instead explained matter in terms of fire, air, earth and water

Leucippus and Democritus

Which statement is INCONSISTENT with dalton atomic theory ?

Atoms of uranium can be changed into barium

The alpha particles used in Ruthford’s gold foil experiment are positively charged. Why do these particles deflect or bounce back when approaching the center of the gold foil ?

Attraction to the positive charge of the nucleus

What was Robert Milikan’s role in the discovery of subatomic particles

Recognizing the electron as a low mass particle

Greenhouse gases help keep earth warm but now pose a threat. What primarily causes this shift ?

Excessive release of greenhouse gases by humans

How do plants primarily help mitigate global warming ?

Absorbing & consuming carbon dioxide

Which of the following greenhouse gasses is the primary contributor to global warming ?

Carbon dioxide (CO2)

Which of the following is NOT true?

Atoms of most elements are found freely in nature.

Which method is preferable to separate a mixture of an insoluble solid and a liquid?

Filtration

Which method is preferable for separating two liquids with different boiling points?

Distillation

Air is classified as what type of matter?

Homogenous mixture.

Why do gases not have a fixed volume?

Gas particles expand and compress with container size.

Isopropyl alcohol is also known as rubbing alcohol because it was originally used as a liniment for massages and muscle rubs. Which property of rubbing alcohol is a chemical property?

Flammability.

Which of the following statements from John Dalton’s atomic theory was later proven to be INCORRECT?

Atoms of the same element have the same mass and properties.