Chem Final pt.1
What happens to metallic properties of the elements as you move up from lead (Pb) to Carbon (C) on the periodic table?
Located in the same group but the average Atomic Mass decreases as you move up. Electronegativity increases since it is closer to Flourine.
Which is homogeneous of these four: 1. Soil 2.Air 3. Ice Water 4.Cereal in Milk
What is the charge of the Chromium in the CrI2?
+2 (undo the crossing method)
Draw the Electron Configuration OR Orbital Filling Diagram for the most common ion formed by Sulfur, and indicate which electrons have been lost or gained.
** draw on white board
How many electrons does the P3- ion have? (remember if it is - it gained electrons but if it is + it lost electrons)
P3- ion has 18 electrons.
What is the empirical formula of a compound that contains 50.05% Sulfur and 49.94% Oxygen by Mass?
**Show work on the board (Ven or Melissa)
How many moles of N2O3 are there in 85.1g of Dinitrogen Trioxide?
85.1g x 1mole/76g = 1.12 moles
(76g comes from adding up amu)
What is the formula of the compound of Sodium ions and Phosphorus ions?
Sodium is Na+1 (if there's is 1 it's never written)
Phosphorus-3
(now crisscross) Na1P3 --> Na3P
Which of the following is not one of the 5 principles of Dalton's Theory:
1. All matter is made of indestructible atoms
2. Atoms of different elements combine in complex, fractioned ratios to form compounds
3. Atoms of different elements vary in size and mass
2. Atoms of different elements combine in complex, fractioned ratios to form compounds
Complete the chart using the give information
**Chart is drawn on white board
***