| Sig. Figs. | SI Base Units, Prefixes, and Calculations | Atoms and Isotopes | Covalent Compunds | Ionic Compounds/Polyatomic Ions |
|---|---|---|---|---|
|
4
How many sig figs are in the following number?
0.4007 |
kg
What is the SI unit for mass?
|
two or more forms of the same element with the same number of protons, but differing numbers of neutrons
Define isotope.
|
A bond between two nonmetals in which atoms share electrons
Define covalent bond.
|
A bond between a metal cation (or NH3+) and a nonmetal anion (or neg. charged polyatomic ion) in which one ion donates electrons and the other accepts electrons to form a lattice
Define ionic bond.
|
|
1
How many sig figs are in the following number?
1,000 |
131,000 or 1.31 X 10^5
How many cm are in 1.31 km?
|
33 p+, 43 n0, 36 e-
See slide 9.
|
Yes
Is the following compound covalent?
H2O |
Se^2-
The most common ion formed by the element selenium is _________.
|
|
hundredth place/2 places after the decimal
To what place would we round the solution to this problem?
2.874 - 1.22 |
162.56cm
I am 64 inches tall. What is my height in cm, given the following conversion factor?
1in=2.54cm |
See slide 10.
What does the Lewis dot structure for nitrogen look like?
|
sulfur trioxide
Name the following compound.
SO3 |
acetate
Name the following polyatomic ion.
CH3COO- |
|
3
How many sig figs would be included in the solution to the problem below?
36.681/21.0 |
3.3 mL
I am cooking and my recipe tells me to put 3 grams of olive oil in a pan. The density of olive oil is 0.92 g/cm^3. How much olive oil should I put into my pan (in mL)?
|
24.31 amu
See slide 11.
|
N2O4
What is the formula for dinitrogen tetroxide?
|
BaCl2
What is the formula for barium chloride?
|
|
1,382
What is the answer to the following problem, rounded to the correct number of sig figs?
126.2 X (2.41+8.537) |
37.44kg
The concentration of mercury (Hg) in the water of a polluted lake is 0.24 μg per L. What is the total mass in kg of Hg in the lake if its surface area is 12.0 km2 and the average depth is 13.0 m?
(1 m3 = 1000 L) |
Cl-35: 76%
Cl-37: 24%
The two most abundant isotopes of chlorine are Chlorine – 35 and Chlorine – 37. Cl-35 has a relative mass of 34.97 and Cl-37 has a relative mass of 36.97. What is the % abundance of each isotope?
|
dichlorine heptoxide
Name the following compound.
Cl2O7 |
copper (II) sulfate
Name the following compound.
CuSO4 |
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