Multiple Choice Answers

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(TCO 3) Magnesium reacts with oxygen to form magnesium oxide.
2 Mg + O2 –> 2 MgO
The number of moles of MgO produced when 0.20 mole of O2 reacts completely is
0.20 mole
0.40 mole
0.60 mole
0.10 mole
0.80 mole

(TCO 3) Which one of the following elements forms two or more ions with different ionic charges?
Ca
K
Fe
F
O

(TCO 3) The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction? 2C + O2 –> 2 CO
double replacement
endothermic
catalytic
combination
single replacement

(TCO 4) A solution with a pH of 4 is
extremely acidic
moderately acidic
neutral
slightly basic
extremely basic

(TCO 4) According to the Arrhenius concept, if HNO3 were dissolved in water, it would act as
a base
an acid
a source of hydroxide ions
a source of H- ions
a proton acceptor

(TCO 4) The [H3O+] of a solution with pH = 2.0 is
10 M
-10 M
1 x 102 M
1 x 10-2 M
1 x 10-12 M

(TCO 5) Which one of the following is not a type of protein?
contractile proteins
antibodies
enzymes
signal proteins
all of these are types of proteins

(TCO 5) Which one of the following statements about the functional groups of organic compounds is false?
Functional groups help make organic compounds hydrophilic.
Many biological molecules have two or more functional groups.
Functional groups participate in chemical reactions.
All functional groups include a carbon atom of the organic compound’s skeleton.
Functional groups help make organic compounds soluble in water.

(TCO 5) DNA differs from RNA because DNA
contains thymine in place of uracil
consists of a single rather than a double polynucleotide strand
contains the sugar ribose rather than the sugar deoxyribose
contains phosphate groups not found in RNA
all of the choices are correct

(TCO 6) The nuclear envelope is composed of ______.
a single membrane
genes
DNA
a double membrane
carbohydrates

(TCO1) You notice that over the past month, many students have started wearing a new style of school sweatshirt. You think to yourself, maybe the bookstore recently started selling this new sweatshirt style. This prediction is
a type of observation
an example of an experimental question
an experiment
a type of control
an example of a hypothesis

(TCO 1) Fill in the blank: Deductive reasoning is used to make ________ based on a hypothesis.
data
theories
statistical tests
correlations
predictions

(TCO 1) Once a scientific hypothesis becomes a theory, it
becomes static
cannot be challenged
is subject to modification
cannot be changed
is irrefutable

(TCO 2) Which of the following does NOT involve a change of state?
melting ice
freezing water
vaporization of alcohol
sublimation of dry ice
pouring water into a vacuum-insulated bottle

(TCO 2) The specific heat of a substance is the amount of heat needed to
change 1 g of the substance from the solid to the liquid state
raise the temperature of 1 g of the substance by 1°C
change 1 g of the substance from the liquid to the solid state
convert 1 g of a liquid to gas
convert 1 g of a solid to a gas

(TCO2) The nucleus of an atom contains
only neutrons
protons and electrons
protons and neutrons
only electrons
only protons

(TCO 3) What is the molar mass of sodium phosphate, Na3PO4?
226.1 g
119.2 g
164.0 g
354.0 g
308.0 g