CHEMISTRY 1 - Describe the function and usefulness

Question 1 (Essay Worth 3 points)

Describe the function and usefulness of a model in scientific investigations, using the atomic model as an example.

Question 2(Multiple Choice Worth 2 points)

An atom of sodium has an atomic mass of 23 and an atomic number of 11. The atom contains

23 protons, 23 electrons, and 11 neutrons. 11 protons, 11 electrons, and 12 neutrons. 11 protons, 12 electrons, and 11 neutrons. 23 protons, 12 electrons, and 23 neutrons.

Question 3(Multiple Choice Worth 2 points)

The neutrons of an atom have ______ charges and are located ____ the nucleus.

negative, inside no, inside no, outside negative, outside

Question 4(Multiple Choice Worth 2 points)

What one factor identifies an atom as a specific element?

the number of protons. the atomic mass. the number of neutrons. the mass number.

Question 5 (Essay Worth 3 points)

The results of Rutherford’s gold foil experiment disproved the model of the atom that his mentor and colleague had proposed. How does this example represent part of the necessary process for developing a scientific theory?

Question 6 (Essay Worth 3 points)

A given atom has 3 protons, 4 neutrons, and 3 electrons. Describe how you can use those three values to describe the structure, charge, and mass of the atom.

Question 7(Multiple Choice Worth 2 points)

The experiment that shot heavy particles at a thin sheet of gold foil was responsible for leading to the discovery of the

atom. neutron. electron. nucleus.

Question 8 (Essay Worth 3 points)

What were the expected results of Rutherford’s gold foil experiment, based on Thomson’s model of the atom? How did the real results of the gold foil experiment change the accepted model of the atom?