Who came up with the idea that matter is composed of tiny, indivisible particles?
Select one:
a. Aristotle
b. Democritus
c. Ptolemy
d. Plato
e. Copernicus
What is a theory?
Select one:
a. It is a coherent set of ideas used as principles of explanation and prediction
b. It is a careful measurement made with a device.
c. It is a wild guess about an event.
d. It is a good guess made to explain observed facts.
The law of conservation of mass states that
Select one:
a. in a chemical reaction, matter is neither created nor destroyed
b. electricity is made of a special type of atoms
c. elements are composed of compounds
d. atoms are composed of electrons, protons and neutrons
Rutherford's experiment showed that
Select one:
a. the atom is indivisible
b. the atom has no nucleus
c. the atom is mainly empty space
d. electrons are much heavier than the protons
An element is
Select one:
a. a substance that can be analyzed into simpler substances
b. a substance that cannot be analyzed into simpler substances
c. a substance made only of neutrons
d. a mixture of different compounds
The prefix mega stands for
Select one:
a. a million
b. a billion
c. a thousand
d. a trillion
Written correctly in scientific notation, 0.000000457 is equal to
Select one:
a. 4.57x10-7
b. 4.57x10-6
c. 0.000000457
d. 45.7x10-7
According to our understanding, the atom is indivisible.
Select one:
True
False