Periodic Table
When do ions forms?
Ions are formed when they lose or gain electrons.
What is the atomic charge of aluminum with 13 protons and 10 electrons?
3+
What is the name of AlCl3?
aluminum chloride
C6H12O6 is the chemical formula of sugar. How many hydrogen atoms are there?
12
Calculate the molar mass of O2 gas.
31.998g/mol
How do electronegativity values vary within groups and across periods?
Electronegativity values decreases within a group and increases within a period.
What is the formula of the ionic compound composed of calcium cations and chloride anions?
CaCl2
Write the chemical formula of manganese (II) fluoride.
MnF2
How many protons are there in the nucleus of a V atom?
23
Calculate the molar mass of CaCO3
100.086g/mol
Which element in each pair has a higher electronegativity value?
Cl and F
Mg and Ne
F
Ne
Which of the following compounds are most likely NOT ionic? name all
H2O CO2 Na2O CaS SO2
H2O CO2 SO2
Name this compound K2CrO4
potassium chromate
How many atoms of each element are there in Ca(CO3)2?
Ca 1
C 2
O6
Calculate the molar mass of Be(NO3)2
133.020g/mol
Which element has the largest atomic radius?
Na Mg Al Si
Na
Which of the following pairs of atoms would you expect to combine chemically to form an ionic compound? Name all.
Li and S F and Cl O and S Al and O
I and K H and N
Li and S Al and O I and K
Write the formula of copper(II) hydroxide
Cu(OH)2
Conduct an atom inventory for H3PO4
H 3
P 1
O 4
Calculate the molar mass of Ba3(PO4)2
601.93g/mol
Arrange the following elements in order of increasing ionization energy.
Be , Mg, Sr
Sr, Mg, Be
Write the formula for the the following compounds?
KCl BaS MgBr2 Li2O
potassium chloride
Barium sulfide
Magnesium bromide
Lithium oxide
Write the chemical formula of iron sulfate.
FeSO4
How many atoms of each element are there in 5Cu(NO3)2?
Cu = 5
N=10
O = 30
Calculate the molar mass of Fe(C2H3O2)3
177.132g/mol