Question 1

A percentage yield greater than 100% has been reported in a scientific paper you are assigned to read.What would be a reasonable explanation for this?

Accepted Answer

A)  A lack of training of the professor who published the study. 
B)  The product was measured more than once. 
C)  Small measurement errors could have caused this to occur. 
D)  It must be a typographical error since yields can't exceed 100%. 
A)  A lack of training of the professor who published the study. 
B)  The product was measured more than once. 
C)  Small measurement errors could have caused this to occur. 
D)  It must be a typographical error since yields can't exceed 100%.

Question 2

All redox reactions are exothermic reactions.

Accepted Answer

A) True 
 B)False

Question 3

All redox reactions involve oxygen.

Accepted Answer

A) True 
 B)False

Question 4

Integers are used in properly balanced chemical equations because whole moles of substances are needed for a reaction.

Accepted Answer

A) True 
 B)False

Question 5

The modern definition of oxidation is a process

Accepted Answer

A)  involving a reaction with oxygen. 
B)  in which hydrogen is gained. 
C)  in which electrons are gained. 
D)  none of the choices. 
A)  involving a reaction with oxygen. 
B)  in which hydrogen is gained. 
C)  in which electrons are gained. 
D)  none of the choices.

Question 6

The ultimate source of all energy used by animals is the carbohydrates found in plants.

Accepted Answer

A) True 
 B)False

Question 7

In the reaction 2H2O $\rarr$ 2H2 + O2,2.0 mol water will produce how many grams of O2?

Accepted Answer

A)  16 
B)  32 
C)  36 
D)  64 
A)  16 
B)  32 
C)  36 
D)  64

Question 8

Consider the reactants and propose the right side of the equation.
Mg + H2SO4 $\rarr$ ______

Accepted Answer

A)  no reaction 
B)  MgHSO4 
C)  MgSO4 + H2 
D)  MgH2 + SO4 
A)  no reaction 
B)  MgHSO4 
C)  MgSO4 + H2 
D)  MgH2 + SO4

Question 9

A REDOX reaction can also be a(n)

Accepted Answer

A)  combination reaction. 
B)  single replacement reaction. 
C)  decomposition reaction. 
D)  More than one response is correct. 
A)  combination reaction. 
B)  single replacement reaction. 
C)  decomposition reaction. 
D)  More than one response is correct.

A percentage yield greater than 100% has been reported in a scientific paper you are assigned to read.What would be a reasonable explanation for this?

All redox reactions are exothermic reactions.

All redox reactions involve oxygen.

Integers are used in properly balanced chemical equations because whole moles of substances are needed for a reaction.

The modern definition of oxidation is a process

The ultimate source of all energy used by animals is the carbohydrates found in plants.

In the reaction 2H₂O $\rarr$ 2H₂ + O₂,2.0 mol water will produce how many grams of O₂?

Consider the reactants and propose the right side of the equation. Mg + H₂SO₄ $\rarr$ ______

A REDOX reaction can also be a(n)

Matter, measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

The States of Matter

Solutions and Colloids

Reaction Rates and Equilibrium

Acids,bases,and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

Exam 5: Chemical Reactions

A percentage yield greater than 100% has been reported in a scientific paper you are assigned to read.What would be a reasonable explanation for this?

All redox reactions are exothermic reactions.

All redox reactions involve oxygen.

Integers are used in properly balanced chemical equations because whole moles of substances are needed for a reaction.

The modern definition of oxidation is a process

The ultimate source of all energy used by animals is the carbohydrates found in plants.

In the reaction 2H2O →\rarr→ 2H2 + O2,2.0 mol water will produce how many grams of O2?

Consider the reactants and propose the right side of the equation. Mg + H2SO4 →\rarr→ ______

A REDOX reaction can also be a(n)

Matter, measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

The States of Matter

Solutions and Colloids

Reaction Rates and Equilibrium

Acids,bases,and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

In the reaction 2H₂O $\rarr$ 2H₂ + O₂,2.0 mol water will produce how many grams of O₂?

Consider the reactants and propose the right side of the equation. Mg + H₂SO₄ $\rarr$ ______