Empirical Formula Lab

Purpose: to find the percent composition of MgO 

Procedure:

1. Measure mass of crucible, then mass of magnesium in the crucible

2. Heat over Bunsen burner until white

3. When cooled, measure mass of crucible with MgO inside

4. Calculate percent composition of MgO 

Data:

Crucible mass: 19.64 g

Mg mass: .499 g

MgO mass: .0648

Mg moles: .00207917

O moles: 9.3 x 10^-4

Percent Oxygen: 23%

Percent Magnesium: 77%

Ch 10-11 pg 685-761 Review

Practice problems 12-15 pg 727 & 730

Practice problems 16-17 pg 733

Types of Chemical Reactions pogil

% Composition of Hydrates Lab

Unheated mass:

A- Copper II Sulfate: 2.10g

B- Calcium Chloride: 2.17g

C- Sodium Sulfate: 2.24g

Test tube mass: 5.21g

While heating...

Copper II Sulfate: Changed from light blue powder to dark blue from the water, then to grey powder as it dried.

Calcium Chloride: no change

Sodium Sulfate: sizzled, then dried up

Results:

Copper II Sulfate: 1.57g

Calcium Chloride: 1.83g

Sodium Sulfate: 1.49g

Balanced Equations Worksheet

Practice problems 41-42 pg 673

Practice problems 33-40 pg 662-671

Practice problems 16-23 pg 648-656