Unit #2 - The Atom

_____ are the smallest units of elements.

Tags

NGSS.MS-PS1-1

What law states the following: "atoms are neither created nor destroyed during a chemical change, therefore the mass of matter present throughout the reaction remains constant"?

• Law of Definite Proportions

• Law of Chemical Reactions

• Law of Conservation of Mass

• Law of Multiple Proportions

• Law of Atomic Structure

Tags

NGSS.MS-PS1-5

What law states the following: "all samples of a pure compound contain the same elements in the same proportion by mass"?

• Law of Definite Proportions

• Law of Chemical Reactions

• Law of Conservation of Mass

• Law of Multiple Proportions

• Law of Atomic Structure

What law states the following: "when two elements can react to form more than one compound, a fixed mass of one element will react with masses of the other element in a ratio of small, whole numbers"?

• Law of Definite Proportions

• Law of Chemical Reactions

• Law of Conservation of Mass

• Law of Multiple Proportions

• Law of Atomic Structure

What scientist was credited with development of the atomic theory in 1803?

• Democritus

• Antoine Lavoisier

• Joseph Proust

• John Dalton

• Benjamin Franklin

True or false? - "Atoms can be subdivided into protons, neutrons, and electrons" was a component of John Dalton's early atomic theory.

• True

• False

The first proposed atomic model was credited to Democritus and John Dalton. What was this atomic model called?

• Nuclear Model

• Solid Sphere Model

• Plum Pudding Model

• Planetary Model

• Quantum Model

Which of the following scientists discovered the electron through experiments with cathode ray tubes?

• Max Planck

• Ernest Rutherford

• Robert Milikan

• James Chadwick

• JJ Thomson

What was JJ Thomson's atomic model referred to as?

• Quantum Model

• Planetary Model

• Nuclear Model

• Solid Sphere Model

• Plum Pudding Model

Which of the following scientists determined the overall charge and mass of an electron using his infamous oil drop experiment?

• JJ Thomson

• James Chadwick

• Robert Milikan

• Ernest Rutherford

• Henry Moseley