Question 1

What is the correct name for PCl5?

Accepted Answer

Phosphorus

Question 2

Give an example of an ionic compound.

Accepted Answer

Sodium chl

Question 3

What is the chemical formula for dinitrogen tetroxide?

Accepted Answer

The answer of What is the chemical formula for dinitrogen...

Question 4

Which polyatomic ion is not labeled correctly?

Accepted Answer

A) NH4+ammonium 
B) ClO4- perchlorate 
C) CN- cyanate 
D) NO3-nitrate 
E) All are labeled correctly. 
A) NH4+ammonium 
B) ClO4- perchlorate 
C) CN- cyanate 
D) NO3-nitrate 
E) All are labeled correctly.

Question 5

What is the correct formula for the compound formed between potassium and phosphorus based on their positions in the periodic table?

Accepted Answer

A) K2P 
B) KP2 
C) KP 
D) K2P2 
E) K3P 
A) K2P 
B) KP2 
C) KP 
D) K2P2 
E) K3P

Question 6

Which one of the oxoacid formulas and names is not correctly matched?

Accepted Answer

A) H2SO3 sulfurous acid 
B) HCl hydrochloric acid 
C) H2SO4 sulfuric acid 
D) HNO3 nitric acid 
E) All are correct. 
A) H2SO3 sulfurous acid 
B) HCl hydrochloric acid 
C) H2SO4 sulfuric acid 
D) HNO3 nitric acid 
E) All are correct.

Question 7

A   O   ion has ________ protons, ________ neutrons, and ________ electrons.

Accepted Answer

A) 8; 8; 6 
B) 8; 10; 10 
C) 8; 8; 10 
D) 8; 8; 8 
E) 8; 16; 8 
A) 8; 8; 6 
B) 8; 10; 10 
C) 8; 8; 10 
D) 8; 8; 8 
E) 8; 16; 8

Question 8

Which one of the following is a cation?

Accepted Answer

A) NO3- 
B) SO2 
C) Ca2+ 
D) Na 
E) O2 
A) NO3- 
B) SO2 
C) Ca2+ 
D) Na 
E) O2

Question 9

The Curiosity rover now on Mars analyzed rocks and found magnesium to have the following isotopic composition. What is the average atomic mass of magnesium in these rocks? Mass (u)
% Abundance
23)9872
79)70
24)9886
10)13
25)9846
10)17

Accepted Answer

A) 24.31 u 
B) 24.29 u 
C) 24.33 u 
D) 24.99 u 
E) 33.33 u 
A) 24.31 u 
B) 24.29 u 
C) 24.33 u 
D) 24.99 u 
E) 33.33 u

Question 10

What is the chemical formula for calcium nitrite?

Accepted Answer

The answer of What is the chemical formula for calcium...

Question 11

Buffer solutions that maintain certain levels of pH or acidity are widely used in biochemical experiments. One common buffer system uses sodium dihydrogenphosphate and sodium monohydrogenphosphate. What are the formulas of these two compounds?

Accepted Answer

A) Na(HPO4) and Na(HPO4)2 
B) NaH2PO4 and Na2HPO4 
C) Na2H2PO4 and NaHPO4 
D) NaPO4 and NaHPO4 
E) Na2(HPO4)2 and Na2(HPO4) 
A) Na(HPO4) and Na(HPO4)2 
B) NaH2PO4 and Na2HPO4 
C) Na2H2PO4 and NaHPO4 
D) NaPO4 and NaHPO4 
E) Na2(HPO4)2 and Na2(HPO4)

Question 12

Which one of the following is a molecular compound? Molecular compounds also are known as covalent compounds.

Accepted Answer

A) Na2O 
B) CaO 
C) FeO 
D) CCl4 
E) Fe2O3 
A) Na2O 
B) CaO 
C) FeO 
D) CCl4 
E) Fe2O3

Question 13

Give an example of a halogen.

Accepted Answer

Bromine; a

Question 14

Which element labeled A-E in the periodic table below will have an ionic charge of +3?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 15

Nitrogen and oxygen combine to form several different nitrogen oxides. Chemical analysis found that the N:O mass ratio in NO is 0.875. Two other nitrogen oxides were produced by reacting 8.4 g of nitrogen completely with 4.8 g of oxygen in one case and in another case by reacting 4.2 g of nitrogen with 9.6 g of oxygen. What are the empirical formulas of these two nitrogen oxides?

Accepted Answer

The answer of Nitrogen and oxygen combine to form several...

Question 16

The sixth period of the periodic table contains ________ elements.

Accepted Answer

A) 18 
B) 32 
C) 24 
D) 16 
E) 8 
A) 18 
B) 32 
C) 24 
D) 16 
E) 8

Question 17

Aqua regia is a mixture of hydrochloric acid and nitric acid that is capable of dissolving gold. What are the formulas of these acids?

Accepted Answer

A) HClO, HNO4 
B) HClO4, HNO3 
C) HCl, HNO2 
D) HCl, HNO3 
E) HCl, HNO 
A) HClO, HNO4 
B) HClO4, HNO3 
C) HCl, HNO2 
D) HCl, HNO3 
E) HCl, HNO

Question 18

Protons and neutrons are examples of ________

Accepted Answer

A) nuclei. 
B) nuclides. 
C) nucleons. 
D) isotopes. 
E) charged particles. 
A) nuclei. 
B) nuclides. 
C) nucleons. 
D) isotopes. 
E) charged particles.

Question 19

The formula for a terbium phosphate compound is Tb3(PO4)4. What would be the formula for a terbium sulfate compound given that the charge of terbium is the same in both compounds?

Accepted Answer

A) Tb2(SO3)3 
B) Tb(SO4)2 
C) Tb(SO3)2 
D) Tb3(SO4)4 
E) Tb(SO4)3 
A) Tb2(SO3)3 
B) Tb(SO4)2 
C) Tb(SO3)2 
D) Tb3(SO4)4 
E) Tb(SO4)3

Question 20

Which one of these formula-name combinations is not correct?

Accepted Answer

A) diphosphorus tetroxide: P2O4 
B) tetraphosphorus nonoxide: P4O9 
C) diphosphorus pentoxide: P2O5 
D) tetraphosphorus heptoxide: P4O6 
E) phosphorus monoxide: PO 
A) diphosphorus tetroxide: P2O4 
B) tetraphosphorus nonoxide: P4O9 
C) diphosphorus pentoxide: P2O5 
D) tetraphosphorus heptoxide: P4O6 
E) phosphorus monoxide: PO

Exam 2: Atoms, Ions, and Molecules: Matter Starts Here

What is the correct name for PCl5?

Give an example of an ionic compound.

What is the chemical formula for dinitrogen tetroxide?

Which polyatomic ion is not labeled correctly?

What is the correct formula for the compound formed between potassium and phosphorus based on their positions in the periodic table?

Which one of the oxoacid formulas and names is not correctly matched?

A O ion has ________ protons, ________ neutrons, and ________ electrons.

Which one of the following is a cation?

The Curiosity rover now on Mars analyzed rocks and found magnesium to have the following isotopic composition. What is the average atomic mass of magnesium in these rocks? Mass (u) % Abundance 23)9872 79)70 24)9886 10)13 25)9846 10)17

What is the chemical formula for calcium nitrite?

Buffer solutions that maintain certain levels of pH or acidity are widely used in biochemical experiments. One common buffer system uses sodium dihydrogenphosphate and sodium monohydrogenphosphate. What are the formulas of these two compounds?

Which one of the following is a molecular compound? Molecular compounds also are known as covalent compounds.

Give an example of a halogen.

Which element labeled A-E in the periodic table below will have an ionic charge of +3?

The sixth period of the periodic table contains ________ elements.

Aqua regia is a mixture of hydrochloric acid and nitric acid that is capable of dissolving gold. What are the formulas of these acids?

Protons and neutrons are examples of ________

The formula for a terbium phosphate compound is Tb3(PO4)4. What would be the formula for a terbium sulfate compound given that the charge of terbium is the same in both compounds?

Which one of these formula-name combinations is not correct?

Matter and Energy: The Origin of the Universe

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: The Quest for Clean Energy

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

The Main Group Elements: Life and the Periodic Table

Transition Metals: Biological and Medical Applications

Filters

What is the correct name for PCl₅?

A O ion has protons, neutrons, and electrons.

The formula for a terbium phosphate compound is Tb₃(PO₄)₄. What would be the formula for a terbium sulfate compound given that the charge of terbium is the same in both compounds?