Naming Compounds
Of the following elements, which are transition metals:
Barium, Gold, Selenium, Phosphorus, Chromium
Gold and chromium
54Fe
26
How many protons, electrons, and neutrons does this isotope of iron have?
26 protons
26 electrons
28 neutrons
Write the chemical formula for Iron (II) Oxide
FeO
Balance the chemical equation:
C5H12 + O2 --> CO2 + H2O
C5H12 + 8 O2 --> 5 CO2 + 6 H2O
Which element has the atomic number 25?
Mangenese
Classify the following compounds as Ionic or Covalent:
Barium Sulfate
Chromium (III) Oxide
Iodine Pentaflouride
Barium Sulfate - ionic
Chromium (III) Oxide - ionic
Iodine Pentaflouride - covalent
If you have 3.46 grams of NaCl, how much NaCl do you have in moles?
molar mass of NaCl= 58.44 g/mol
3.46 grams x (1 mol/58.44 grams)= 0.0592 mol NaCl
How many protons and neutrons does a 40K atom contain?
40= mass number = protons +neutrons
atomic number K = 19
40-19= 21 neutrons
Write the chemical formula for Chromium (VI) Chloride
CrCl6
What’s the molar mass of hydroxyapatite, the mineral that makes up your bones that has a molecular formula of Ca5(PO4)3(OH)?
501.67 g/mol
If you have 5.0 x 10-9 moles of NaCl, how many individual NaCl molecules do you have?
1 mole= 6.02 x 1023 molecules
5.0 x 10-9 moles (6.02x1023)= 30. x 1014 molecules
Write out the full name of Au(SO4)2
Gold (IV) Sulfate
What is the percent composition of oxygen in Ca5(PO4)3(OH)?
Hint: Molar mass= 501.67
13 oxygen molecules
(13(15.99)/501.67) 100= 41.4%
___ SO2 + ___ O2 ⟶ ___ SO3
Given 1.30 mol of SO2 gas and 1.05 mol of O2 gas, which reactant is the limiting reagent of this unbalanced reaction? How many moles of SO3 were produced?
Balanced Eq: 2 SO2 + ___ O2 ⟶ 2 SO3