Question 1

If shaded and unshaded spheres represent atoms of different elements,as shown in drawing (1),which drawings (2)-(4)represent the law of multiple proportions?

Accepted Answer

A) only drawings (2)and (3) 
B) only drawings (2)and (4) 
C) only drawings (3)and (4) 
D) drawings (2),(3),and (4) 
A) only drawings (2)and (3) 
B) only drawings (2)and (4) 
C) only drawings (3)and (4) 
D) drawings (2),(3),and (4)

Question 2

The number of nucleons in a  
 nucleus is

Accepted Answer

A) 92. 
B) 144. 
C) 236. 
D) 328. 
A) 92. 
B) 144. 
C) 236. 
D) 328.

Question 3

The nuclear decay process that involves the particle having the greatest mass is ________ emission.

Accepted Answer

A) alpha 
B) beta 
C) gamma 
D) positron 
A) alpha 
B) beta 
C) gamma 
D) positron

Question 4

Phosphate ion has the formula ________.

Accepted Answer

The answer of Phosphate ion has the formula ________....

Question 5

24.0 g of which element contains the greatest number of atoms?

Accepted Answer

A) B 
B) C 
C) N 
D) O 
A) B 
B) C 
C) N 
D) O

Question 6

The chemical formula for calcium nitride is

Accepted Answer

A) Ca(NO3)2. 
B) Ca(NO2)2. 
C) Ca3N2. 
D) CaN2. 
A) Ca(NO3)2. 
B) Ca(NO2)2. 
C) Ca3N2. 
D) CaN2.

Question 7

Carbon dioxide is an example of

Accepted Answer

A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture. 
A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture.

Question 8

Use the periodic table below to answer the following questions.  
-Which is the correct formula of the binary fluoride of element B?

Accepted Answer

A) BF2 
B) BF3 
C) BF5 
D) BF6 
A) BF2 
B) BF3 
C) BF5 
D) BF6

Question 9

Gold is an example of

Accepted Answer

A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture. 
A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture.

Question 10

Assume that the mixture of substances in drawing (1)undergoes a chemical reaction.Which of the drawings (2)-(4)represents a product mixture that is consistent with the law of mass conservation?

Accepted Answer

A) drawing (2) 
B) drawing (3) 
C) drawing (4) 
A) drawing (2) 
B) drawing (3) 
C) drawing (4)

Question 11

The thiosulfate ion is

Accepted Answer

A) HS-. 
B) HSO42-. 
C) SO52-. 
D) S2O32-. 
A) HS-. 
B) HSO42-. 
C) SO52-. 
D) S2O32-.

Question 12

The formula for dinitrogen trioxide is

Accepted Answer

A) N(OH)3. 
B) (NO3)2. 
C) N2O3. 
D) N3O2. 
A) N(OH)3. 
B) (NO3)2. 
C) N2O3. 
D) N3O2.

Question 13

-Which of the above drawings represents a Cl- ion?

Accepted Answer

A) drawing (a) 
B) drawing (b) 
C) drawing (c) 
D) drawing (d) 
A) drawing (a) 
B) drawing (b) 
C) drawing (c) 
D) drawing (d)

Question 14

As the atomic number of the elements increases,the ratio of neutrons to protons in stable nuclei

Accepted Answer

A) decreases. 
B) stays the same. 
C) increases. 
D) is unrelated to stability. 
A) decreases. 
B) stays the same. 
C) increases. 
D) is unrelated to stability.

Question 15

Which one of the following compounds contains ionic bonds?

Accepted Answer

A) SrO 
B) H Br 
C) P Br3 
D) SiO2 
A) SrO 
B) H Br 
C) P Br3 
D) SiO2

Question 16

Which of the following represent isotopes?
[A:  ]
[  B:  ]
[  C:  ]
[  D:  ]

Accepted Answer

A) A and B 
B) A and C 
C) A and D 
D) C and D 
A) A and B 
B) A and C 
C) A and D 
D) C and D

Question 17

The number of atoms of carbon in 12 g of carbon is closest to .

Accepted Answer

A) 12 
B) 1022 
C) 1023 
D) 1024 
A) 12 
B) 1022 
C) 1023 
D) 1024

Question 18

Tell the type of decay process occurring in the following nuclear reaction.

Accepted Answer

A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission 
A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission

Question 19

How many electrons are in the ion,PO43-?

Accepted Answer

A) 26 
B) 44 
C) 47 
D) 50 
A) 26 
B) 44 
C) 47 
D) 50

Question 20

undergoes alpha decay producing one alpha particle and a single nuclide.To balance the equation,________ and ________ must be added to the right side of the equation below.   
→ ? + ?

Accepted Answer

The answer of   
undergoes alpha decay producing one...

Exam 2: Atoms, molecules, and Ions

If shaded and unshaded spheres represent atoms of different elements,as shown in drawing (1),which drawings (2)-(4)represent the law of multiple proportions?

The number of nucleons in a nucleus is

The nuclear decay process that involves the particle having the greatest mass is ________ emission.

Phosphate ion has the formula ________.

24.0 g of which element contains the greatest number of atoms?

The chemical formula for calcium nitride is

Carbon dioxide is an example of

Use the periodic table below to answer the following questions. -Which is the correct formula of the binary fluoride of element B?

Gold is an example of

Assume that the mixture of substances in drawing (1)undergoes a chemical reaction.Which of the drawings (2)-(4)represents a product mixture that is consistent with the law of mass conservation?

The thiosulfate ion is

The formula for dinitrogen trioxide is

-Which of the above drawings represents a Cl- ion?

As the atomic number of the elements increases,the ratio of neutrons to protons in stable nuclei

Which one of the following compounds contains ionic bonds?

Which of the following represent isotopes? [A: ] [ B: ] [ C: ] [ D: ]

The number of atoms of carbon in 12 g of carbon is closest to .

Tell the type of decay process occurring in the following nuclear reaction.

How many electrons are in the ion,PO43-?

undergoes alpha decay producing one alpha particle and a single nuclide.To balance the equation,________ and ________ must be added to the right side of the equation below. → ? + ?

Chemistry: Matter and Measurement

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

The number of nucleons in a nucleusis

-Which of the above drawings represents a Cl^- ion?

How many electrons are in the ion,PO₄^3-?

undergoes alpha decay producing one alpha particle and a single nuclide.To balance the equation, and must be added to the right side of the equation below. → ? + ?