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Chem_C2

Chem Chapter 2

QuestionAnswer
Which pair of substances could be used to illustrate the law of multiple proportions? CO, CO2
The law of conservation of mass states: that the total mass of material present after a chemical reaction is the same as the total mass present before the reaction
_A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. This is a statement of ________. the law of constant composition
If an atom has 15 protons, how many electrons does it have? 15
Where do the protons reside in an atom? inside the nucleus
Which of the particles is the most massive? neutron
Which is the least massive? electron
The nucleus has most of the mass and comprises most of the volume of an atom. no
Which of these can vary without changing the identity of the element? mass number
In what part of the atom does the strong nuclear force operate? in the nucleus
Which of the following factors determines the size of an atom? The volume of space occupied by the electrons of the atom.
All atoms of a given element have the same ________ number of protons
200 pm is the same as ________ Å. 2
The atomic number indicates ________. the number of protons or electrons in a neutral atom
The mass number of an atom of 15N is ________. 15
The nucleus of an atom does not contain ________. electrons
Which one of the following basic forces is so small that it has no chemical significance? gravity
Gravitational forces act between objects in proportion to their ________. masses
In the periodic table, the elements touching the steplike line are known as ________. metalloids
Horizontal rows of the periodic table are known as ________ periods
Vertical columns of the periodic table are known as ________ groups
Which type of formula provides the most information about a compound? structural
Which model does not give any information about how the atoms are joined together? molecular formula
When a metal and a nonmetal react, the ________ tends to lose electrons and the ________ tends to gain electrons. metal, nonmetal
Which one of the following is most likely to gain electrons when forming an ion? a nonmetal
Which one of the following is most likely to gain electrons when forming an ion? a nonmetal
What two substances form a covalent bond? two nonmetals
What two substances form an ionic bond? metal and a nonmetal
What is the empirical formula of the compound formed between W6+ and O2−–? WO3
H2SeO4 is called selenic acid. True
Which species below is the cyanide ion? CN-
The correct name for K2S is ________.The correct name for K2S is ________. potassium sulfide
Which species below is the perchlorate ion? ClO4-
The name of the ionic compound (NH4)3PO4 is ________. ammonium phosphate
The name of the ionic compound NH4CN is ________. ammonium cyanide
The name of the binary compound N2O4 is ________ dinitrogen tetroxide
 

 



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