Unit 6 and 7 Flashcard

Valence Electrons
What part of the atom is involved in chemical bonding?
Ionic, Covalent, Metallic
What are the three major types of bonds?
The Octet Rule- Atoms will lose, gain, or share electrons in order to acquire a full set of 8 valence electrons (the stable electron configuration of a noble gas)
Why do chemical bonds form?
Its a chemical reaction in which heat is absorbed. ?H is positive.
What does endothermic mean?
Its a chemical reaction in which heat is evolved. ?H is negative
What does exothermic mean?
Breaking bonds is endothermic.
Is the breaking of a bond endothermic or exothermic?
Forming bonds is exothermic.
Is the forming of a bon endothermic or exothermic?
It attains a full valence shell of 8 electrons like a noble gas.
What kind of outer shell does an atom usually attain when it combines with other atoms?
A molecule has covalent bonds.
Which type of bond forms a molecule?
Salts are formed by ionic bonds.
Which type of bond forms a salt?
Electronegativity difference between two elements determines the type of bond they’ll have.
What determines the type of bond that forms between atoms of two elements?
Electronegativity is the ability to attract electrons in a bond.
Define electronegativity
They are metallic.
What is Mg and Fe?
They are Ionic.
Na2CO3, CaCl2, KClO3, FePO4
They are covalent.
CH4, H2S, PCL3
Salt
Magnesium chloride
Metal
Copper
Salt
Calcium sulfate
Network soild
Silicon dioxide
Molecular solid
phosporus trifluoride
Metal
Zinc
Salts
Which type of solid does ionic bonds contain?
Molecular or network
Which type of solid does covalent bonds contain?
Metal
Which type of solid does metallic bonds contain?
Ionic and metallic solids (Network solids has very high melting points and boiling points as well)
Which solids have high melting and boiling points?
Covalent solids
Which solids have low melting and boiling points?
Transfer of valence electrons from metal to a a nonmental.
What is an ionic bond?
Electrostatic force (attraction between pos. and neg. ion) holds ionic bonds together.
What type of force holds ionic bonds together?
Salts
Ionic compounds are known as ____.
high
The atoms in an ionic compound have a relatively ____ electronegativity difference.
because the non-metals have similar electronegativities, they must share electrons in order to obtain 8 valence electrons
What is a covalent bond?
They have low melting and boiling points
What types of mp and bp do covalent compounds have?
Molecule
What is another name for a covalent compound?
Two electrons
A single bond has…
Four electrons
A double bond has…
Six electrons
A triple bond has…
True
Diamonds consists of molecules of carbon.
False
Atoms other than H and He want to have an octect because it is stable.
True
Oxygen exists as O2 in its natural state.

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