CHE 1110 Lecture Notes - Lecture 5: Technetium, Ruthenium, Yttrium
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1- How many moles of N2O5 contain the same number of nitrogen atoms as exactly 19 mol of NO2?
2- How many grams are contained in 0.900 mol of calcium phosphate, Ca3 (PO4)2?
3- Ga
Number of electrons =_______ electrons
Number of protons = _________protons
4- element number 79 Number of electrons = _____electrons Number of protons = ______protons 5- What are the symbol and name for an element whose average atoms have a mass that is 59.6% of the mass of an average chromium atom? Symbol: Name: 6- In the first 36 elements, 8 elements have atoms whose average mass is within 0.2 u of being twice the atomic number of the element. Choose the symbols and names for these 8 elements. (Select all that apply.) - oxygen -silicon -chlorine -helium -bromine -sulfur -boron -argon -aluminum -carbon -lithium -calcium -nitrogen -neon -copper -sodium |
Write the Formula/ Formula Unit for the following Compounds
Determining the formula for Magnesium Fluoride?
- identify the charges Ā
- Cross the Charges, Ā
- If the subscript is a 1 it does not need to be written.
- If there is a common subscript such as 2 as in , reduce it to Ā Ā
Write Formula Unit for the Below Ionic Compounds
Ā |
Name |
Cation (+) |
Anion (-) |
Formula |
1 |
Sodium chloride |
Ā | Ā | Ā |
2 |
Aluminum chloride |
Ā | Ā | Ā |
3 |
Aluminum phosphide |
Ā | Ā | Ā |
4 |
Magnesium oxide |
Ā | Ā | Ā |
5 |
Cesium fluoride |
Ā | Ā | Ā |
6 |
Strontium nitride |
Ā | Ā | Ā |
7 |
Lithium sulfide |
Ā | Ā | Ā |
8 |
Calcium chloride |
Ā | Ā | Ā |
9 |
Sodium bromide |
Ā | Ā | Ā |
10 |
Beryllium iodide |
Ā | Ā | Ā |
11 |
Strontium fluoride |
Ā | Ā | Ā |
12 |
Aluminum fluoride |
Ā | Ā | Ā |
13 |
Potassium nitride |
Ā | Ā | Ā |
14 |
Sodium sulfide |
Ā | Ā | Ā |
15 |
Lithium oxide |
Ā | Ā | Ā |
16 |
Calcium oxide |
Ā | Ā | Ā |
Ā
PART 2: Complete the table
4.)___ | 7.)___ | 10.)___ | 13.)___ | ||
No. of electrons | 1.)___ | 5.)___ | 36 | 86 | 1 |
No. of neutron/s | 2.)___ | 0 | 50 | 11.)___ | 14.)___ |
No. of protons | 3.)___ | 6.)___ | 8.)___ | 12.)___ | 15.)___ |
Mass number | 210 | 1 | 9.)___ | 210 | 3 |
Charge | 0 | 0 | +2 | -1 | 0 |