Chapter 3-Applied Chemistry Review

Neutral atoms contain equal numbers of what?

• protons

• neutrons

• electrons

• photons

The atomic symbol for beryllium, ⁹₄Be, indicates that

• the atomic number is equal to 9-4

• the atomic number is 9

• the atomic number is 4

• the mass number is 4

Tags

NGSS.MS-PS1-1

The atomic mass of an atom of carbon is 12 amu, and the atomic mass of an atom of oxygen is 16 amu. To produce CO, 16 g of oxygen combine with 12 g of carbon. To produce CO₂, 32 g of oxygen combine with 12 g of carbon. The ratio of the mass of oxygen in CO₂ to the mass of oxygen in CO is

• 1:1

• 2:1

• 1:2

• 8:3

Tags

NGSS.HS-PS1-7

Rutherford's gold-foil experiment led him to conclude that

• Thomson's plum pudding model of the atom was accurate.

• alpha particles were a poor choice for a bombardment material.

• a dense region of positive charge existed somewhere in the atom.

• light was emitted by electrons returning to ground state.

Tags

NGSS.HS-PS1-8

Which of the following is NOT one of the five principles of Dalton's theory?

• Atoms of different elements combine in simple, whole-number ratios to form compounds.

• All matter is made of indivisible, indestructible atoms.

• All atoms have similar physical and chemical properties.

• Chemical reactions consist of the combination, separation, or rearrangement of atoms.

According to the law of definite proportions, any two samples of KCl will have

• the same mass

• slightly different molecular structures but the same two elements

• different densities

• the same elements in the same proportions by mass

According to the law of conservation of mass, when sodium, hydrogen, and oxygen react to form a compound, the mass of the compound will be

• equal to the sum of the masses of the reactants

• greater than the sum of the masses of the reactants

• less than the sum of the masses of the reactants

• either less than or equal to the sum of the masses of the reactants

Tags

NGSS.HS-PS1-7

Thomson's experiment showed that the charge-to-mass ratio of electrons was

• greater with noble gases than for other gases

• less with noble gases than for other gases

• the same in all gases

• dependent on the element's atomic mass

An atom of potassium has 19 protons and 20 neutrons. Its mass number is

• 9

• 19

• 20

• 39

Which of the following is not equal to 1.00 mol of carbon-12?

• 6.022 x 10²³ carbon atoms

• 12.0 grams of carbon

• 6.0 g of carbon