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Science Exam: Chemical Bonding

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The attraction between a positive metal ion and the electrons surrounding it is a
metallic bond
What is the chemical name for the compound with the formula Na2S?
Sodium Sulfide
In what form can an ionic compound conduct electricity?
when dissolved in water
Ions that are made of more than one atom are examples of.....
polyatomic ions
A chemical bond formed when two atoms share electrons is called a(n) __________-
covalent bond
Each family in the periodic table has its own characteristic properties based on the number of ____________.
valence electrons
Ionic compounds are electrically_______________.
neutral
A mixture that is made of two or more elements--one that is a metal----that has the properties of metal is a(n) ____________________.
alloy
A covalent bond in which electrons are shared unequally is ___________.
polar
An ionic bond is the attraction between __________.
oppositely charged ions.
Which of the following best describes a metal crystal?
positive metal ions surrounded by freely moving valence electrons.
Water is polar and oil is nonpolar. What happens when the two liquids are poured into the same container?
The liquids do not mix.
Which of the following terms means that metals can be rolled into thin sheets, as in aluminum foil, or beaten into complex shapes?
malleable
When an atom loses an electron, it becomes a _____________.
positive ion
Magnesium bromide is an ionic compund with the chemical formula MgBr2. What does the "2" tell you?
There are two bromide ions for every magnesium ion.
Steel is an alloy of one or more elements combined with _______.
iron
Which of the following is a characteristic property of ionic compounds?
a. They contain no charged particles
b. They form hard, brittle crystals with characteristic shapes
c. They have low melting points
d. They have low boiling point
b. They form hard brittle crystals with characteristic shapes
If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have _____________.
8 valence electrons
In the chemical formula for an ionic compound, which item is written first?
positive ion
What is a double bond?
two pairs of electrons shared between two atoms
Electrons involved in bonding between atoms are __________.
valence electrons
What is the greatest number of valence electrons an atom can have?
8
Which of the following properties is NOT characteristic of steel?
a. strength
b. resistant to rust
c. does not readily react with water
d. reacts readily with air
reacts readily with air
True or False: Each family in the periodic table has its own characteristic properties based upon its number of valence electrons.
True
True or False: The attraction between a positive ion and a negative ion results in a covalent bond.
False, ionic
True or False: When electrons are shared between two atoms, a covalent bond is formed.
False. ionic bond
True or False: In every alloy, at least one of the components is a metal.
True
In an electron dot diagram of aluminum (Al), how many dots should be drawn around the elements symbol? Why? (see diagram)
3 dots because its in Group 3.
List three elements from the group containing the most reactive nonmetals (see diagram).
Chlorine, Florine, Bromine
What is the symbol for a calcium ion (see diagram)?
Ca2+
Which is a property shared by most molecular compounds?
low melting point
Molecular compounds do not conduct electricity because they....
do not break up into ions
Molecules that contain two polar bonds are
sometimes polar
What is an advantage that alloys might have over many pure metals?
Alloys resist rust
Brass and steel are examples of__________
alloys
What strong alloy, containing carbon, iron, and another metal like chromium or nickel, is used to make construction equipment, bicycle frames, and train rails?
steel
Which term means that metal can be pulled into thin strands or wires?
Ductile
True or False: Whan an atom gains an electron it becomes a positive ion.
False. It becomes a negative ion
True or False. Orderly crystal shapes, high melting points, and electrical conductivity when dissolved in water are properties of ionic compounds.
True
True or False: A nonpolar bond is formed when two atoms share electrons unequally.
False. a polar bond is formed
True or False: Steel is an alloy of iron with carbon, nickel, and other elements
True
Chemical bonds form when valence electrons are ______________ between atoms.
transferred/shared
In the periodic table, atoms are arranged from left to right and from top to bottom in order of increasing ____________.
atomic number
With the exception of helium, Group 18 elements usually have ___________ valence electrons, so they do not usually react with other elements.
eight
Nitrate, ammonium, and carbonate are examples of _____________________ ions.
polyatomic
When ions have a positive charge form bonds with ions having negative charge, the charge on the resulting compound is ____________.
zero
Fluorine is a _____________ molecule because the valence electrons are shared equally between the two fluorine atoms.
nonpolar
Solid metal are good conductors of heat and ______________.
electricity
Element in Group1 lose one electron to form ions with with a ____________ charge.
positive 1
In a double covalent bond, _________ electrons are shared between two atoms.
four or 2 pairs
how many atoms of a Group 17 element would be needed to react with one atom of a Group 2 element? Explain. (see diagram)
2 because it will have to give up both and elements in group 17 only need one more
Which group of elements loses electrons most easily?
Group 1
Which group contains elements with two valence electrons?
Group 6
What is the charge for a Lithium Ion (see table)
1+
What is the chemical formula for the compound that forms when sodium and chlorie combine? (see table)
Na+ Cl-
What is the chemical name for CaCO3? (see table)
Calcium Carbonate
What is the name of the ion with the chemical formula NO3+? (see table)
Nitrogen
Which of these ions are polyatomic? Explain (see table).
Nitrogen because it has more than one ion in it.