Atomic Theory I
State whether each statement is describing a physical or chemical property:
a) Ice melts at 0°C
b) Iron reacts with oxygen to form rust
a) Physical property
b) Chemical property
What is a mole?
The unit used when counting 6.02×10^23 particles.
0.00510 has _____________ sig figs.
3
Convert 250 mL to liters
0.25 L
When I introduced myself, I mentioned that there is a famous food/condiment in my hometown of Zhenjiang that is also sold in grocery stores here. What is it?
An atom of Aluminum,
Determine:
Atomic number
Mass number
Number of protons
Number of neutrons
Number of electrons
Atomic number: 13
Mass number: 27
Protons: 13
Neutrons: 14
Electrons: 13
Calculate the molar mass of calcium hydroxide, Ca(OH)2.
Count atoms:
Ca = 1
O = 2
H = 2
Atomic masses:
Ca = 40.08 g/mol
O = 16.00 g/mol
H = 1.01 g/mol
Calculation:
1(40.08)+2(16.00)+2(1.01)=40.08+32.00+2.016=74.096≈74.10
7.300 × 10³ has ___________ sig figs.
4
Convert 5.6 kg to grams
5600 g
How many years of Ms. Ye been teaching in St. Regis?
2
What is the electron configuration for Na+?
1s22s22p6
How many molecules are in 200.0 g of NaCl?
2.060×10^24 molecules
120,030 has ___________ sig figs.
5
Convert 0.0350 mol of CO₂ to molecules
2.11×1022 molecules
Who is our guest today?
Mr. Preston
Which element is represented by the following?
1s22s22p63s23p3
Phosphorus (P)
Find the atomic mass of Copper (II) sulphate dihydrate
CuSO4⋅2H2O
195.64 g/mol
12.45+3.2+0.056=
15.7
Convert 12.0 g of NaCl to moles
0.205 mol
What's the cut-off for the midterm?
5.1 Mole
Give the electron core configuration, orbital diagram, and valence electron for Zr4+
Neutral Zr electron configuration:
Zr: [Kr] 5s2 4d2
Zr⁴⁺ loses 4 electrons (2 from 5s and 2 from 4d):
Zr4+=[Kr]
1s ↑↓
2s ↑↓
2p ↑↓ ↑↓ ↑↓
3s ↑↓
3p ↑↓ ↑↓ ↑↓
4s ↑↓
3d ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
4p ↑↓ ↑↓ ↑↓
0 valence electrons
How many moles are in 85.0 mg of silver nitrate, AgNO₃?
5.00×10^−4 mol
1. 4.56×0.030=
2. 45.60÷3.20=
0.14
14.3
Convert 18.5 grams of baking soda (sodium bicarbonate) to moles.
0.220 mol
When is our midterm? Date, time, and location.
November 4th. 9:30-12:10, RLC Polygon