Question 1

What is the reason that U-238 is different from U-235?

Accepted Answer

A)  three more electrons 
B)  three more protons 
C)  three more neutrons 
D)  there is no difference 
A)  three more electrons 
B)  three more protons 
C)  three more neutrons 
D)  there is no difference

Question 2

Determine the molecular weight of hydrogen peroxide,H2O2,in u (or amu).

Accepted Answer

A)  17.01 
B)  18.02 
C)  34.02 
D)  33.01 
A)  17.01 
B)  18.02 
C)  34.02 
D)  33.01

Question 3

A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus?

Accepted Answer

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

Question 4

How many atoms are contained in a sample of krypton,Kr,that weighs 8.38 g?

Accepted Answer

A)  one Avogadro's number 
B)  one-tenth Avogadro's number 
C)  one 
D)  one-tenth 
A)  one Avogadro's number 
B)  one-tenth Avogadro's number 
C)  one 
D)  one-tenth

Question 5

How many silicon atoms (Si)are contained in a 12.5 g sample of silicon?

Accepted Answer

A)  2.68 * 1023 
B)  5.83 *10-22 
C)  1.35 *1024 
D)  1.71 * 1021 
A)  2.68 * 1023 
B)  5.83 *10-22 
C)  1.35 *1024 
D)  1.71 * 1021

Question 6

The number of Cr atoms in a 26.0 g sample of chromium is x.How many atoms,expressed in terms of x,would be contained in 26.98 g of aluminum (Al)?

Accepted Answer

A)  x 
B)  x/2 
C)  2x 
D)  x+2 
A)  x 
B)  x/2 
C)  2x 
D)  x+2

Question 7

A molecular formula

Accepted Answer

A)  is represented using the symbols of the elements in the formula. 
B)  is represented using a system of circles that contain different symbols. 
C)  cannot be represented conveniently using symbols for the elements. 
D)  is represented using words rather than symbols. 
A)  is represented using the symbols of the elements in the formula. 
B)  is represented using a system of circles that contain different symbols. 
C)  cannot be represented conveniently using symbols for the elements. 
D)  is represented using words rather than symbols.

Question 8

The symbols for all of the elements always begin with a capital letter.

Accepted Answer

A) True 
 B)False

Question 9

What is meant when the symbol C-12 (or 12C)is used?

Accepted Answer

A)  the carbon atom weighs 12 grams 
B)  the carbon atom weighs 12 pounds 
C)  the carbon atom weighs 12 amu 
D)  the melting point of carbon is 12°C 
A)  the carbon atom weighs 12 grams 
B)  the carbon atom weighs 12 pounds 
C)  the carbon atom weighs 12 amu 
D)  the melting point of carbon is 12°C

What is the reason that U-238 is different from U-235?

Determine the molecular weight of hydrogen peroxide,H₂O₂,in u (or amu).

A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus?

How many atoms are contained in a sample of krypton,Kr,that weighs 8.38 g?

How many silicon atoms (Si)are contained in a 12.5 g sample of silicon?

The number of Cr atoms in a 26.0 g sample of chromium is x.How many atoms,expressed in terms of x,would be contained in 26.98 g of aluminum (Al)?

A molecular formula

The symbols for all of the elements always begin with a capital letter.

What is meant when the symbol C-12 (or ¹²C)is used?

Matter, measurements, and Calculations

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

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 2: Atoms and Molecules

What is the reason that U-238 is different from U-235?

Determine the molecular weight of hydrogen peroxide,H2O2,in u (or amu).

A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus?

How many atoms are contained in a sample of krypton,Kr,that weighs 8.38 g?

How many silicon atoms (Si)are contained in a 12.5 g sample of silicon?

The number of Cr atoms in a 26.0 g sample of chromium is x.How many atoms,expressed in terms of x,would be contained in 26.98 g of aluminum (Al)?

A molecular formula

The symbols for all of the elements always begin with a capital letter.

What is meant when the symbol C-12 (or 12C)is used?

Matter, measurements, and Calculations

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

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

Determine the molecular weight of hydrogen peroxide,H₂O₂,in u (or amu).

What is meant when the symbol C-12 (or ¹²C)is used?