What type of bonding involves freely moving electrons?
Metallic
100
True or false. Ionic compounds have lower mp/bp than covalent compounds
False
100
What is defined as the ability to be hammered into thin sheets?
Malleability
100
True or false. Sublimation is a chemical change
False (phase change from solid to gas)
200
What, in terms of atomic structure, qualifies an atom as stable? (give me the BEST answer)
When its outermost electron shell is full
200
In an ionic bond, electrons transfer from what to what?
metal to nonmetal
200
What type of compound/bond is always soluble in water?
Ionic
200
What is defined as a compound that contains carbon?
An organic compound
200
What kind of decay particle, when passed through an electric field, would be attracted to the positive electrode?
Beta particle
300
How many bonds can an atom of Sulfur form?
Two
300
Which of the following is a molecular compound?
a. KCl
b. SrO
c. FeS
d. HBr
HBr (molecular means covalent)
300
Which of the following can conduct electricity only in the aqueous state?
a. Cu
b. HCl
c. Ag
d. SrS
SrS---ionic
300
What is defined as the attraction for electrons in a chemical bond?
Electronegativity
300
Explain, in terms of atomic structure, why atomic radius increases as you go down group 2.
more electron shells
400
When a bond is formed between atoms, energy is...
a. released
b. absorbed
c. stays the same
released
400
What type of bonding involves electrons being shared unequally?
polar covalent
400
Atoms in a compound have an electronegativity difference of 2.2. What type of bond forms between them?
Ionic
400
What is defined as a covalently bonded (sharing electrons) group of atoms that have a net electric charge (“fat chunks”)?
Polyatomic Ion
400
How many p, n, and e does an atom of Cs-133 have?
p = 55
n = 78
e = 55
500
For the following chemical reaction, is it an endothermic or exothermic process?
MgS(s) --> Mg(s) + S(s)
Endothermic (b/c it takes energy/have to absorb energy to break bonds)
500
What type(s) of bonding is present in the compound NaClO?
Ionic and Covalent (whenever have more than 2 elements, check table E for a polyatomic. Polyatomics are covalently bonded and the bond with the metal is ionic)
500
Quartz is an example of a network solid - a macromolecule with covalent bonds. Do network solids have high or low melting/boiling points?
HIGH
500
What are very large, covalently bonded molecules called that are very rigid and have high melting/boiling points?
Network Solids
500
Write the complete nuclear equation for the spontaneous decay of the radioisotope C-14