Chemistry Final Exam Review – Chapter 4 (Atomic Structure)

Question 1

What does the mass number represent?

Accepted Answer

number of protons and neutrons

Question 2

What does the atomic number represent?

Accepted Answer

number of protons

Question 3

The electron was discovered in which experiment?

Accepted Answer

the cathode ray experiment

Question 4

What were some discoveries of the cathode ray experiments (2 answers)?

Accepted Answer

the particles were the same, regardless of cathode material, the particles were negatively charged

Question 5

An additional result of the gold foil experiment was that

Accepted Answer

the nucleus is very small and positively charged

Question 6

Which of the following is a statement of Dalton's Atomic Theory (2 answers)?

Accepted Answer

atoms are rearranged in chemical reactions, all atoms of a given element are identical in size and mass

Question 7

What is the average atomic mass of an element?

Accepted Answer

a weighted average of all naturally occurring isotopes (amu)

Question 8

The oil drop experiment discovered the (2 answers)

Accepted Answer

the mass of the electron, charge of the electron

Question 9

The gold foil experiment (3 answers)

Accepted Answer

disproved the plum pudding model, discovered the nucleus, used alpha particles

Question 10

Matter cannot be created or destroyed is the law of

Accepted Answer

conservation of mass

Question 11

How many protons, neutrons, and electrons does the isotope 15N (nitrogen-15) have?

Accepted Answer

p = 7, n = 8, e = 7

Question 12

Which of the following is a statement of Dalton's Atomic Theory?

Accepted Answer

all matter is composed of atoms

Question 13

What is the name of an isotope of oxygen with 9 neutrons?

Accepted Answer

oxygen-17

Question 14

Which of the following is a statement of Dalton's Atomic Theory (2 answers)?

Accepted Answer

atoms cannot be subdivided, created or destroyed, atoms combine in whole number ratios to form compounds

Questions 14