which of the following compounds does not contain molecules?
a. H2
b. CO2
c. NaCl
d. H2O
c. NaCl
100
Which of the following statements about ions is true?
a. all meals form more than one type of ion
b. many transition metals can form more than one type of ion
c. halogens form more than one type of ion
d. alkali metals form more than one type of ion
b
100
true or false: a tendency to shater when struck is a typical property of an ionic compound?
true
100
which statement about metals is true?
a. a metal lattice is extremely rigid
b. the bonds within a metal lattice are weak
c. electrons in a metal lattice are free to move
d. generally, metals have a low melting poin
c
200
In an electron dot diagram, the symbol for an element is used to represent
the nucleus
200
The elements most likely to form more than one type of ion are the (group of the periodic table
transition metals
200
an alloy that contain mainly copper and tin is
bronze
200
The chemical formula for calcium chloride, CaCl2, shows that the compound contains two _________ ions for every _________ ion.
chloride, calcium
200
The ions in solid sodium chloride are arranged in a structure called a(an) ___________ lattice.
crystal
300
In the compound MgCl2, the subscript 2 indicates that
There are 2 chloride ions for each magnesium ion
300
In the name carbon dioxide, he prefix of the second word indicates that a molecule of carbon dioxide (number of atoms of each element)
two oxygen atoms
300
In it's simplest form, the alloy brass consists of zinc and ________.
copper
300
In ionic compounds, the sum of the charges of all cations and anions must be ___________.
zero, neutral
300
In an ionic compund, the attractions between cations and ___________ hold the compound together.
anions
400
You see a structureal formula in which the symbols for elements are connected by a long dash. You can assume that the chemical bonds in the compound are...
covalent
400
A polar covalent bond forms when ________ are not shared equally between atoms.
electrons, valence electrons
400
The metallic bonds in a transition metal, such as tungsten, are stronger than the metallic bonds in a(an) __________ metal such as sodium.
alkali
400
A(An) ___________ ion is a covalently bonded group of atoms that has a position or negative charge.
polyatomic
400
The water molecule H2O is polar because it contains two polar single bonds and
a. its molecule has a linear shape
b. molecules that contain polar bonds are always polar
c. its molecule has a bent shape
d. the attractions between water molecules are strong
c
500
water has a higher boiling point than expected because
of the strong attractions between polar water molecules
500
In a metal lattice, __________ are surrounded by a pool of shared electrons.
cations
500
In an electron dot diagram, each dot represents a__________ __________.