Physical Science Chapter 4

Front

Democritus believed that matter was made up of microscopic particles

Back

that could not be divided.

Front

According to John Dalton's observations, when elements combine in a complex,

Back

the ratio of their masses is always the same.

Front

Which of the following is NOT part of John Dalton's atomic theory?
- All elements are composed of atoms.
- Elements combine with each other in simple, whole number ratios.
- Atoms contain subatomic particles.
- A compound contains atoms of more than one element.

Back

Atoms contain subatomic particles.

Front

Which of the following most closely represents John Dalton's atomic model? Options: a nucleus with a cloud of electrons around it, a hollow sphere with a dense core, a small, solid sphere with predictable mass for a given element, a sphere that is hollow throughout its extent

Back

a small, solid sphere with predictable mass for a given element

Front

The experiments of J. J. Thomson provided evidence that an atom

Back

contains negatively charged particles

Front

What caused the deflection of some of the alpha particles in Rutherford's gold foil experiment?

Back

Nuclei in the gold atoms

Front

In an atomic model that includes a nucleus, positive charge is

Back

concentrated in the center of an atom.

Front

Which subatomic particle has a negative charge? Options: electron, positron, neutron, proton

Back

electron

Front

Which of the following is unique for any given element? Options: the number of neutrons, the charge on the electrons, the number of protons, the amount of mass present

Back

the number of protons

Front

To find the number of neutrons in an atom, you would subtract: atomic number from mass number.

Back

atomic number from mass number.