Sig Figs, Conversions, + Types of Compounds
How many significant figures are in the number:
0.0043260
5
Name the compound: NO2
Nitrogen dioxide
What is the difference between groups + periods on the Periodic Table?
Groups are vertical, periods are horizontal
What is a molar ratio?
A ratio from a balanced chemical equation. It can be used as a conversion factor to calculate the unknown moles of a substance from the moles of the initial substance.
How many orientations can s, p, d, and f orbitals be represented by?
1, 3, 5, 7
Is Mg3N2 an ionic or molecular compound + why?
Ionic - there is a metal (Mg2+) with a nonmetal (N3-)
Name this compound: Na3N
Sodium nitride
What is the conversion factor between entities and moles of a substance?
Avogadro's number (6.022 x 1023)
What is the difference between a limiting and excess reactant?
Limiting reactant is the one that is completely used up. Excess is the reactant that is left over
Name the 4 quantum numbers
n = principle quantum number
l = angular quantum number
ml = magnetic quantum number
ms = spin quantum number
How many protons, neutrons, + electrons are in sulfur-34
16 protons, 18 neutrons, 16 electrons
Write the formula for diiodine heptafluoride
I2F7
What is the molar mass of C6H12O6?
180.16 gmol-1
What is the difference between the empirical formula and molecular formula?
Molecular formulas tell you how many atoms of each element are in a compound, and empirical formulas tell you the simplest or most reduced ratio of elements in a compound.
Are electrons particles or waves? Why?
They are both! They are continuous and particulate
How many nanograms are in 7.61 kilograms?
7.61 x 1012 nanograms
Name this compound: Cu2SO4
copper (I) sulfate OR cuprous sulfate
What is the percent yield for the following data:
Theoretical yield - 78.6 grams
Actual yield - 46.6 grams
59.3%
Balance the following equation:
Fe2O3 + C --> Fe + CO2
2Fe2O3 + 3C --> 4Fe + 3CO2
What is the relationship between n, l, and ml?
l = 0 to n - 1
ml = -l to +l
How many picometers are in 1.56 x 109 Gigameters?
1.56 x 1030 picometers
Name this compound: HgCr2O4
Mercury (II) chromate OR mercuric chromate
There are three isotopes for magnesium. Mg-24 has a relative abundance of 78.99%, Mg-25 has a relative abundance of 10.00%, and Mg-26 has a relative abundance of 11.01%. What is the weighted average atomic mass (with correct units)?
24.31 amu
If a compound has 5.00 moles of carbon, 2.50 moles of hydrogen, and 1 mole or oxygen, what is the empirical formula?
C10H5O2
What are the quantum numbers for the 7th valence electron in fluorine?
n = 2
l = 1
ml = 0
ms = - 1/2