Question 1

The mass of a neutron is equal to the mass of a proton plus the mass of an electron.

Accepted Answer

A) True 
 B)False

Question 2

Determine the number of electrons and identify the correct symbol for an atom with 17 protons and 18 neutrons.

Accepted Answer

A) 17 electrons,   
B) 18 electrons,   
C) 17 electrons,   
D) 17 electrons,   
E) 18 electrons,     
A) 17 electrons,   
B) 18 electrons,   
C) 17 electrons,   
D) 17 electrons,   
E) 18 electrons,

Question 3

Which of these elements exhibits chemical behavior similar to that of oxygen?

Accepted Answer

A) magnesium 
B) sodium 
C) sulfur 
D) chlorine 
E) iron 
A) magnesium 
B) sodium 
C) sulfur 
D) chlorine 
E) iron

Question 4

The alkali metal elements are found in _______ of the periodic table.

Accepted Answer

A) Group 1A 
B) Group 2A 
C) Group 3A 
D) Period 7 
E) Period 1 
A) Group 1A 
B) Group 2A 
C) Group 3A 
D) Period 7 
E) Period 1

Question 5

Which of the following is an example of an observation?

Accepted Answer

A) Gases expand as their temperature increases because the gas molecules are moving more rapidly. 
B) Paraffin wax begins to melt at 57°C. 
C) Three samples of wax are heated to 75°C. 
D) The force acting on an object is equal to its mass times its acceleration. 
E) Will all waxes melt at the same temperature? 
A) Gases expand as their temperature increases because the gas molecules are moving more rapidly. 
B) Paraffin wax begins to melt at 57°C. 
C) Three samples of wax are heated to 75°C. 
D) The force acting on an object is equal to its mass times its acceleration. 
E) Will all waxes melt at the same temperature?

Question 6

Almost all the mass of an atom is concentrated in the nucleus.

Accepted Answer

A) True 
 B)False

Question 7

An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron)

Accepted Answer

A) 15 p, 16 n, 15 e 
B) 16 p, 15 n, 16 e 
C) 16 p, 31 n, 16 e 
D) 32 p, 31 n, 32 e 
E) 16 p, 16 n, 15 e 
A) 15 p, 16 n, 15 e 
B) 16 p, 15 n, 16 e 
C) 16 p, 31 n, 16 e 
D) 32 p, 31 n, 32 e 
E) 16 p, 16 n, 15 e

Question 8

In the periodic table, atoms are arranged in order of

Accepted Answer

A) increasing atomic mass. 
B) increasing atomic number. 
C) physical properties. 
D) periodicity. 
E) chemical reactivities. 
A) increasing atomic mass. 
B) increasing atomic number. 
C) physical properties. 
D) periodicity. 
E) chemical reactivities.

Question 9

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry.It has three naturally occurring isotopes, 28Si, 29Si, and 30Si.Calculate the atomic mass of silicon. Isotope Isotopic Mass (amu)
Abudance
28Si
%
27)976927
92)22
29Si
28)976495
4)69
30Si
29)973770
3)09

Accepted Answer

A) 29.2252 amu 
B) 28.9757 amu 
C) 28.7260 amu 
D) 28.0855 amu 
E) 27.9801 amu 
A) 29.2252 amu 
B) 28.9757 amu 
C) 28.7260 amu 
D) 28.0855 amu 
E) 27.9801 amu

Question 10

Which one of these elements is a transition element?

Accepted Answer

A) Nickel 
B) Tin 
C) Sodium 
D) Sulfur 
E) Calcium 
A) Nickel 
B) Tin 
C) Sodium 
D) Sulfur 
E) Calcium

The mass of a neutron is equal to the mass of a proton plus the mass of an electron.

Determine the number of electrons and identify the correct symbol for an atom with 17 protons and 18 neutrons.

Which of these elements exhibits chemical behavior similar to that of oxygen?

The alkali metal elements are found in _______ of the periodic table.

Which of the following is an example of an observation?

Almost all the mass of an atom is concentrated in the nucleus.

An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron)

In the periodic table, atoms are arranged in order of

Which one of these elements is a transition element?

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Molecular Shape

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Chemical Reactions and Chemical Equations

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

Biochemistry

Nuclear Chemistry

Electrochemistry

Filters

Exam 1: Atoms and Elements

The mass of a neutron is equal to the mass of a proton plus the mass of an electron.

Determine the number of electrons and identify the correct symbol for an atom with 17 protons and 18 neutrons.

Which of these elements exhibits chemical behavior similar to that of oxygen?

The alkali metal elements are found in _______ of the periodic table.

Which of the following is an example of an observation?

Almost all the mass of an atom is concentrated in the nucleus.

An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron)

In the periodic table, atoms are arranged in order of

Which one of these elements is a transition element?

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Molecular Shape

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Chemical Reactions and Chemical Equations

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

Biochemistry

Nuclear Chemistry

Electrochemistry

Filters