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Chapter 4 Chem Test
Terms in this set (85)
freezes at 0 degrees C
covers approximately 70% of earth's surface
is a colorless gas of low mass that is rarely found uncombined
is a pale-green poisonous gas
is the main constituent of charcoal
in its solid form, is called dry ice
has crystals shaped like tiny cubes
is produced when carbon burns in air.
is a metal that is soft enough to be cut with a knife
is the most abundant element in earth's crust
along with silicon, makes up sand
is often called the universal solvent
is the most abundant element in the universe
is a common source of heat
is used as a disinfectant
makes up 0.03% of the atmosphere
melts at close to the boiling point of water
is the lightest of all elements.
can be obtained by the evaporation of sea water
is located in the upper left hand corner of the periodic table
the stability of the noble gas elements other than helium is a result of their having________ valence electrons.
Calcium has two valence electrons, and to become stable, it must _________ electrons
An ion is an atom or group of atoms that is charged because it has lost of gained one or more ____________
Ionically bonded compounds tend to be ____________
The formula C3H8 tells you that this compound contains three carbon atoms and ___________ hydrogen atoms
Covalent bonds involve electrons ___________ between two atoms
Two atoms ________ share more than one pair of electrons between them
In general, ionic compounds are ___________ likely to dissolve in water that are covalent compounds
ionic compounds___________ an electric current in the molten state
the forces of attraction between molecules tend to be ___________
dissolves in water
gas at room temperature
metal with nonmetal
liquid at room temperature
hard, rough crystal
doesn't conduct electricity
Argon is a __________ element
Sugar is an example of a(n) _____________ compound
Nonmetal with a nonmetal
Less soluble in water
Solid and brittle
High melting points
Low melting points
1, reactive, ionic bond; gives 1 e-
How many valence electrons does K. have? Is it reactive? If so, what's the bond type and why is it that type of bond?
8, not reactive, no bond
How many valence electrons does :Ar: (2 more above and below) have? Is it reactive? If so, what's the bond type?
8, not reactive, no bond
How many valence electrons does [:S:]-2 (2 more above and below) have? Is it reactive? If so, what's the bond type?
5, reactive, ionic bond; gained 3
How many valence electrons does .P: (1 more above and below) have? Is it reactive? If so, what's the bond type?
Melting point of 2500 degrees
Ionic or covalent
Found in earth's crust
How would you describe Sr+2
Ionic Compound (metal and nonmetal)
How would you describe CaF2
Covalent Compound (nonmetal and nonmetal)
How would you desribe NO2
Sharing electrons would be a(n) __________
Transfer of electrons would be a(n)__________
pt:8 e-: 8 N:8
How many protons, electrons, and neutrons does oxygen have? (Atomic number is 8, atomic mass is 16)
pt:8 e-: 10 N:8
How many protons, electrons, and neutrons does O-2 have? (Oxygen,Atomic number is 8, atomic mass is 16)
What nobel gas does O-2 most resemble? (Oxygen,Atomic number is 8, atomic mass is 16)
Strontium has 2 valence electrons, is it reactive?
Neon has 8 valence electrons, is it reactive?
Sodium chloride is commonly known as _________________.
The most important source of sodium chloride is____________.
Solid sodium chloride _____________ an electrical current.
Elemental sodium is a__________________
Sodium metal is normally stored under ____________.
Chlorine is one of the ___________ reactive of all elements
Carbon dioxide gas changes from a ___________ to a solid at about -80 degrees celcius
The science of organic chemistry is concerned with compounds that contain ____________
Oxygen makes up______________ of the Earth's air
___________ doesn't burn, but it is the gas that ordinarily supports the burning of other substances.
Gas to a Liquid
At -253 degrees celcius, hydrogen changes from a _____________
In general, compounds have properties that are ___________ the properties of the elements of which they are composed
The attraction of 2 atoms for a shared pair of electrons
A compound whose atoms that are held together by covalent bonds
A regular, repeating arrangement of atoms, ions, or molecules in 3 demensions
Any compound that conducts electricity when melted or dissolved in water.
The forces between the particles that make up a substance
An atom or group of combined atoms that has a charge because of the loss or gain of electrons
The strong attractive force between ions of opposite charge
A compound comprised of ions; the transfer of electrons
An uncharged group of 2 or more atoms held together by covalent bonds
Noble Gas Configuration
The state of an atom achieved by having the same valence electron configuration as a noble gas atom, the most stable configuration
The model of chemical stability that states that atoms become stable by having 8 electrons in their outer energy level except for some of the smallest atoms, which only have 2 elcetrons
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