1) Classify the following elements as metal, semi-metal, or non-metal.
Ba ______Kr ______W ______Ge ______In ______Se ______
2) Which two elements in (1) could combine to form an ionic compound? Three pairs are possible.
3) Which elements in (1) would likely exist in atomic form?
4) Would any of the elements in (1) likely exist molecular form?
5) Given the formula CuS, first describe this compound as ionic or molecular. How do you know?
6) Name the compound in (5).
7) In each of the following the names are incorrect for the formula unit given. Make the correction.
1) Rh2O rhodium(IV) monoxide
2) NiBr2nickel boride
3) VNvanadium(I) nitride
4) CaI2calcium(II) iodide
5) CrS3copper(III) sulfite
6) GaPgallium potasside
7) Al2Te3aluminum(II) telluride
8) Determine the formula unit using the crossing rule for the ionic compound that forms in the reaction of
a) Sr + Pb) Ca + Fc) Rb + N
d) Ba + Se) Al + I
9) Circle the combinations that would give a molecular compound.
a) Sc + Nb) H + Ic) O + Fd) Br + Cl
10) Complete the isotope table. Be sure to include answers to X and ?.
Symbol# of Particles / 80?X- / ??X2+ / 38X0 / ??Pb?
Neutrons / 16 / 122
Atomic Number
Mass Number / 30 / 87
Protons
Electrons / 36 / 78
11) Label each piece of matter using any of the following appropriate terms:
Homogeneous mixture, heterogeneous mixture, element, compound, atom, molecule, molecular, ionic
a) freshly squeezed orange juice
b) baking soda (sodium bicarbonate)
c) neon gas
d) liquid oxygen
e) pure gold (Au)
f) methane gas (CH4)
g) rose gold (an alloy of Cu and Au)
12) Label each process using any of the following appropriate terms:
Chemical, physical, exothermic, endothermic, system loses energy, system gains energy
a) you smell nail polish remover that was opened in another room
b) an ice cube is made from liquid water
c) a green jalapeno pepper is blackened over a flame
d) mold grows on lemons left out in a bowl over time
CHEM 121 W’12