BSC 114-Exam 1 Practice Questions With
Complete Answers
In the term trace element, the adjective trace means that - ANSWER the element is required in
very small amounts
Compared with ^31P, the radioactive isotope ^32P has - ANSWER one more neutron
The reactivity of an atom arises from - ANSWER the existence of unpaired electrons in the
valence shell
Which statements is true of all atoms that are anions? - ANSWER The atom has more
electrons than protons
Which of the following statements correctly describes any chemical reaction that has reached
equilibrium? - ANSWER The rates of the forward and reverse reactions are equal
We can represent atoms by listing the number of protons, neutrons, and electrons-for
example, 2p+, 2n^0, 2e- for helium. Which of the following represents the ^18O isotope of
oxygen? - ANSWER 8p+, 10n^0, 8e-
The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to
form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur
, atom, predict the molecular formula of the compound. - ANSWER H2S
What coefficients must be placed in the following blanks so that all atoms are accounted for
in the products? C6H12O6 S _____ C2H6O + _____ CO2 - ANSWER 2;2
Which of the following is a hydrophobic material? - ANSWER wax
We can be sure that a mole of table sugar and a mole of vitamin C are equal in their -
ANSWER number of moles
Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion
concentration of the lake? - ANSWER 10^-4 M
What is the hydroxide ion concentration of the lake described in question 5? - ANSWER
10^-10 M
A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L
container of cold water, what would be the approximate increase in the temperature of the
water? (Note: A liter of cold water weighs about 1 kg.) - ANSWER 10 degrees C
What are the six most important chemical elements of life? - ANSWER carbon, nitrogen,
oxygen, hydrogen, phosphate, sulfur
Complete Answers
In the term trace element, the adjective trace means that - ANSWER the element is required in
very small amounts
Compared with ^31P, the radioactive isotope ^32P has - ANSWER one more neutron
The reactivity of an atom arises from - ANSWER the existence of unpaired electrons in the
valence shell
Which statements is true of all atoms that are anions? - ANSWER The atom has more
electrons than protons
Which of the following statements correctly describes any chemical reaction that has reached
equilibrium? - ANSWER The rates of the forward and reverse reactions are equal
We can represent atoms by listing the number of protons, neutrons, and electrons-for
example, 2p+, 2n^0, 2e- for helium. Which of the following represents the ^18O isotope of
oxygen? - ANSWER 8p+, 10n^0, 8e-
The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to
form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur
, atom, predict the molecular formula of the compound. - ANSWER H2S
What coefficients must be placed in the following blanks so that all atoms are accounted for
in the products? C6H12O6 S _____ C2H6O + _____ CO2 - ANSWER 2;2
Which of the following is a hydrophobic material? - ANSWER wax
We can be sure that a mole of table sugar and a mole of vitamin C are equal in their -
ANSWER number of moles
Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion
concentration of the lake? - ANSWER 10^-4 M
What is the hydroxide ion concentration of the lake described in question 5? - ANSWER
10^-10 M
A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L
container of cold water, what would be the approximate increase in the temperature of the
water? (Note: A liter of cold water weighs about 1 kg.) - ANSWER 10 degrees C
What are the six most important chemical elements of life? - ANSWER carbon, nitrogen,
oxygen, hydrogen, phosphate, sulfur
