Chapter 2 Test

Question 1

What was Thomson trying to accomplish with the electric and magnetic fields in his cathode ray tube experiments?

Answer 1

He wanted the effects of the electric and magnetic fields to cancel each other out, leaving the beam undeflected.

Question 2

Which of the following particles have roughly the same mass?

Answer 2

a proton and a neutron

Question 3

How did Millikan use counteracting forces in his oil-drop experiments?

Answer 3

He used an electric field to attract a charged oil droplet, thus counteracting gravity to keep an oil droplet suspended in air.

Question 4

How many neutrons are in the nucleus of an atom of calcium-43?

Answer 4

23

Question 5

Given the following data, what would the listing for zinc be in the period table?

Elemental Symbol: Zn
Number of Nucleons in Most Common Isotope: 65
Atomic Number: 30
Atomic Mass: 65.39

Answer 5

30
Zn
65.39

Question 6

The atomic number (number of protons) of an element is more important in determining the characteristics of that element than the atomic mass.

Answer 6

true

Question 7

Calcium and oxygen combine in a 1:1 ratio. Which of the following pairs of elements likely combines in a 1:1 ratio?

Answer 7

strontium (Sr) and sulfur (S)

Question 8

Tellurium (Te) displays reactivity similar to _____

Answer 8

Selenium (Se)

Question 9

Iodine (I), displays reactivity similar to _____.

Answer 9

fluorine (F)

Question 10

The following is a ball-and-stick drawing of the compound cis 1,2-dichloroethene.

What is the empirical formula for 1,2-dichloroethene?

Answer 10

CHCl

Question 11

Through experiments with radioactive elements, it was determined that which particle has a positive charge?

Answer 11

alpha

Question 12

Which experiment or model located electrons outside of the nucleus?

Answer 12

planetary model

Question 13

Which of the three components of an atom are clustered in the nucleus?

Answer 13

neutrons and protons

Question 14

What instrument is used to determine the mass of an ionized particle and is used to calculate the mass of an atom or molecule?

Answer 14

Mass Spectrometer

Question 15

Hydrocarbons contain only hydrogen and carbon. Which of the following is not a class of pure hydrocarbons?

Answer 15

Alcohols

Question 16

How many carbon atoms are in one molecule of methane?

Answer 16

one

Question 17

What is the name for the alkyne with 4 carbon atoms?

Answer 17

Butyne

Question 18

Which of the following is an alkene with 5 carbons?

Answer 18

Pentene

Question 19

Which of the following is not true of the periodic table?

Answer 19

It gave scientists the atomic masses of the elements.

Question 20

The fact that the periodic table is ordered according to atomic number rather than atomic mass suggests that

Answer 20

Atomic number is a more consistent guide to the characteristics of an element.

Question 21

What is the bicarbonate ion, a component of baking soda?

Answer 21

HCO3−

Question 22

Potassium chlorate is used in fireworks. Which of the following is the formula for this chemical compound?

Answer 22

KClO3

Question 23

There are four isotopes of a new element, thinkwellium, Tk. Below is a list of each isotope, its atomic mass, and its abundance. What is the average atomic mass of Tk?

Answer 23

207.2

Question 24

Given the following information, find the atomic mass for the imaginary element Harmanium.

Answer 24

34.3204

Question 25

A new stable element with an atomic number of 120 and an atomic mass of 246 is created in a particle accelerator. Enough of this element is created to determine that it combines with chlorine in a 1:2 ratio. Element 120 should be placed in the same group as _____ on the periodic table.

Answer 25

beryllium (Be)