Metric Conversions
What is the metric factor for the prefix centi
10-2
What does OIL RIG mean in redox chemistry?
Oxidation is losing electrons, reduction is gaining electrons
What are the products of a combustion reaction?
CO2 and H2O
How many sig figs in 3.10 x 103
3 (3.10)
When do you use Avogadro's number as a conversion factor?
when converting between mole count and the individual count of particles
What is the metric factor for micro
10-6
Explain how Al (s) --> Al3+ (aq) is an oxidation
Al0 loses 3 electrons (or the ox state increases, therefore oxidized)
Which reaction category includes a transfer of electrons? Single or Double Displacement?
Single Displacement is Redox. Double just swaps ionic partners
How many sig figs in 12,100
(3) no visible decimal, trailing zeros don't count
When do you use density as a conversion factor?
when converting a mass unit to volume unit or volume unit to mass unit
What is the difference between the metric factor for kilo vs milli
kilo is 103 milli is 10-3
what is the oxidation state of nitrogen in nitrogen dioxide?
Ox-state = 4+
Explain what dissociation of an ionic compound vs ionization of an acid means in terms of "dissolving" in water
Ions dissociate (separate in water) when soluble. Acids are covalent compounds. When an H breaks its covalent bond, it becomes an H+ and the rest of the molecule becomes the anion.
Same number of sig figs? Explain
120. 120.0 120 120 +/- 1
(3) 120. (4) 120.0 (2) 120 (3) 120 +/- 1
what is the name of a conversion factor that converts the heaviness of an element to the mole count of atoms in the element?
In chem 1A we call it the Molar Mass (although atomic weight is acceptable)
Conversion Factor to convert nanometers to meters
10-9 m / 1 nm
What is the half reaction for the reduction in:
2 HCl (aq) + Zn (s) --> ZnCl2 (aq) + H2 (g)
2 e + 2 H+ --> H2
is "amu" a description of a count of protons, heaviness, or volume of 1/12 of a carbon atom?
amu is a mass unit which is equal to 1.661 x 10-24 grams
How many sig figs should you round the answer?
0.020 g divided by 100. mL?
round to 2 sig figs
What is the molar mass of magnesium nitrate?
(Mg = 24.31)+(2N = 28.02)+(6 O = 96) = 148.33 g/mol
Using formal method, 2 conversion factors to convert micrograms to kilograms
(10-6 g/1 ug) x (1 kg/103 g)
What is the formal charge vs the oxidation state of carbon in a carbonate ion?
FC = 0, ox-state = 4+
Draw a picture of dissolved calcium nitrate vs dissolved sulfuric acid vs dissolved formaldehyde (CH2O). Use 2 formula units per beaker.
1 Ca2+ ion and 2 separate NO3- ions. 2 H+ ions and 1 SO42- ion. Separate "intact" CH2O molecules from each other.
How many sig figs will the final answer be rounded to?
23.01 cm + 20 cm + 215.11 cm =
answer is 260 (round to tens place). 2 total sig figs
Explain the difference between the mass number of zinc-64 and average atomic mass of zinc (65.41)
The mass number is the count of p+ and n in a Zn-64 atom and 65.41 is the weighted average mass of all stable isotopes of zinc based on abundance.