ACTIVE LECTURE QUESTIONS Barbara Hunnicutt Seminole Community College

True or False? Protons have a positive charge. a. True b. False Copyright ©

That statement is true. Electrons are negatively charged and neutrons are neutral. Copyright ©

The first three rings of an atom should how many electrons each? a. b.

Remember the rule of eights. Except for the first shell, eight is the preferred

The symbol for potassium is a. b. c. d. Po P K Pm Copyright

K is the symbol for potassium; P is phosphorus. The symbols for some elements

How many protons and electrons does hydrogen have? a. b. c. d. 1, 1

Hydrogen, the simplest atom, has one proton and one electron. The number of protons should equal the number of electrons in an atom. Answers b and c represent isotopes of H. Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

If an element had 6 protons, 10 neutrons, and 6 electrons, what would its

An element with 6 protons, 10 neutrons and 6 electrons has an atomic mass of 16. The atomic mass of an element is the sum of its protons and neutrons. The atomic number is the number of protons, which equals the number of electrons. Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

What is the valence shell? a. b. c. d. The first shell of electrons An incomplete shell of electrons The last shell of electrons The sum of all the electrons Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

The valence shell is the number of electrons in the last shell. This determines the reactivity of the atom. All atoms that need 1 to complete their valence shell are found in the first column of the periodic chart. Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

A bond that involves the transfer of electrons is called a(n) a. b. c. d. covalent bond. hydrogen bond. ionic bond. electronic bond. Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Ionic bonds involve the transfer of electrons. When atoms gain or lose electrons, they become charged and are attracted to atoms of the opposite charge. Covalent bonds involve the sharing of electrons. Note the prefix co- as in cooperate and cohabitate. Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Which of these examples is a compound? a. b. c. d. e. H 2

Ans: CH 4 Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Water is useful in body processes because: a. b. c. d. e. It is a good solvent It acts as an enzyme It has a low heat capacity It is a product in hydrolysis reactions It is chemically inert Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Ans: A Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

The joining of amino acids to form a protein is an example of: a. b. c. d. e. A decomposition reaction An exchange reaction A synthesis reaction A denaturation reaction A hydrolysis reaction Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Ans: C Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

An atom has 6 protons, 8 neutrons, & 6 electrons. Its atomic mass is:

Ans. D Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Atomic mass is equivalent to the number of _____ in an atom: a. b. c. d. e. Protons Neutrons Electrons Protons & electrons Protons & neutrons Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Ans: E Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

An atom with an atomic # of 14 will have_______ electrons in its valence

Ans: B Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

The most abundant element in the human body is: a. b. c. d. e.

The movement of ions across cell membranes is an example of: a. b. c. d. e. Radiant energy Chemical energy Electrical energy Mechanical energy Potential energy Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Enzymes are classified as: a. b. c. d. e. Antibodies Hormones Triglycerides Structural proteins

The nuecleotide chains of DNA are held together by: a. b. c. d. e. Carbon bonds Hydrogen bonds Ionic bonds Nonpolar covalent bonds Polar covalent bonds Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Glycogen is the storage form of _____ in animals: a. b. c. d. e.

The sugar found in DNA is: a. b. c. d. e. Ribose Sucrose Deoxyribose

Which of the following solutions is the weakest acid: a. b. c. d. e. A solution with a p. H of 2. 4 A solution with a p. H of 5. 2 A solution with a p. H of 6. 4 A solution with a p. H of 8. 6 A solution with a p. H of 10. 1 Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings