Question :
41)Statements:
(1) A molecule a group of two or more atoms : 1309568
41)Statements:
(1) A molecule is a group of two or more atoms that functions as a unit because the atoms are bound together by chemical forces.
(2) The crushing of ice to make ice chips is a physical procedure that involves a chemical change.
(3) Most naturally occurring samples of matter are mixtures rather than pure substances.
a)All three statements are true.
b)Two of the three statements are true.
c)Only one of the statements is true.
d)None of the statements is true.
42)Statements:
(1) When the formula for a compound contains parentheses it is an indication that the compound is unstable and subject to decomposition.
(2) The fact that an unknown substance reacts with chlorine is insufficient basis for classifying the unknown as a compound.
(3) All chemical symbols use a two-letter notation to represent the name of an element.
a)All three statements are true.
b)Two of the three statements are true.
c)Only one of the statements is true.
d)None of the statements is true.
43)Statements:
(1) Temperature and pressure are the only major factors that determine the state of matter (solid, liquid, gas) observed for a particular substance.
(2) The components of a mixture maintain their identity if the mixture is heterogeneous but lose their identity if the mixture is homogeneous.
(3) No more than six atoms may be present in a heteroatomic molecule.
a)All three statements are true.
b)Two of the three statements are true.
c)Only one of the statements is true.
d)None of the statements is true.
44)Statements:
(1) A compound must always contain two or more types of atoms.
(2) The description “one substance present, two phases present, all molecules are homoatomic” is consistent with a sample that is an element.
(3) The number of known elements is less than one hundred.
a)All three statements are true.
b)Two of the three statements are true.
c)Only one of the statements is true.
d)None of the statements is true.
45)Statements:
(1) The isolation of the metal iron from its ores involves a series of high temperature reactions in which carbon monoxide is one of the reactants.
(2) Carbohydrates, fats, and proteins all contain the elements hydrogen, oxygen, and carbon.
(3) Substances whose molecules are both diatomic and heteroatomic must be heterogeneous mixtures.
a)All three statements are true.
b)Two of the three statements are true.
c)Only one of the statements is true.
d)None of the statements is true.
46)For the elements calcium, iron, and beryllium; choose the appropriate characterization of the set’s chemical symbols from the response list.
a)All symbols have one letter.
b)All symbols have two letters.
c)All symbols start with the same letter.
d)All symbols start with a letter not the first letter of the element’s English name.
47)For the elements silver, sodium, and potassium; choose the appropriate characterization of the set’s chemical symbols from the response list.
a)All symbols have one letter.
b)All symbols have two letters.
c)All symbols start with the same letter.
d)All symbols start with a letter not the first letter of the element’s English name.
48)For the elements iodine, fluorine, and nitrogen; choose the appropriate characterization of the set’s chemical symbols from the response list.
a)All symbols have one letter.
b)All symbols have two letters.
c)All symbols start with the same letter.
d)All symbols start with a letter not the first letter of the element’s English name.
49)For the elements gold, lead, and bromine; choose the appropriate characterization of the set’s chemical symbols from the response list.
a)All symbols have one letter.
b)All symbols have two letters.
c)All symbols start with the same letter.
d)All symbols start with a letter not the first letter of the element’s English name.
50)For the elements silicon, sulfur, and tin; choose the appropriate characterization of the set’s chemical symbols from the response list.
a)All symbols have one letter.
b)All symbols have two letters.
c)All symbols start with the same letter.
d)All symbols start with a letter not the first letter of the element’s English name.
