Assignment:
1. Who came up with the idea that matter is composed of tiny, indivisible particles?
a. Aristotle
b. Democritus
c. Ptolemy
d. Plato
e. Copernicus
2. What is a theory?
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.
3. The law of conservation of mass states that
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
4. Rutherford's experiment showed that
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
5. An element is
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
6. The prefix mega stands for
a. a million
b. a billion
c. a thousand
d. a trillion
7. Written correctly in scientific notation, 0.000000457 is equal to
a. 4.57x10-7
b. 4.57x10-6
c. 0.000000457
d. 45.7x10-7
8. According to our understanding, the atom is indivisible.
. True
. False