Part A: Colored Flames Demonstration Record your observations in the table, and give the symbol and charge of the metal ion that produces the color in the flame. Metal Salt Flame Color Metal Ion Symbol copper sulfate (CuSO4 Blue Cu2+ sodium chloride (NaCl), Yellow Na+ barium nitrate (Ba(NO3)2) Green Ba2+ potassium permanganate (KMnO4) Purple K+ […]
When and how were these elements discovered? Were they known by Mendeleev in 1869? Did he predict their discovery? Group 16 (VIA) elements, Oxygen (O), Sulfur (S), Selenium (Se), Tellurium (Te), and Polonium (Po), exhibit comparable characteristics. Oxygen (O) was discovered by Carl Wilhelm Scheele in 1772 and validated by Joseph Priestley in 1774 (Hancock, […]
Introduction The experiment attempted to identify the physical and chemical properties associated with chemical changes. A substance is considered to have undergone physical changes when its appearance changes, but its composition remains the same. In a chemical change, a substance is converted to one or more different substances that have different properties. Chemical Equations A […]
The solubility of a solute in a solvent can be influenced by various factors, including the polarity of the solvent, the stirring, particle size and temperature. A solution is saturated if it cannot dissolve any more solute at a given temperature. Electrolytes are substances that conduct electricity when dissolved in water, and can be classified […]
Instructions and Data Table (5 points) Use a steel crucible and cover – heat them before use to dry them. Fill the crucible approximately two-thirds full with sodium bicarbonate. Do not overheat your NaHCO3 sample. It should NOT glow red. Description Result Units 1. Weight of Crucible and Cover (after drying) 47.245 g 2. Weight […]
Part A: Solution Preparation with Copper(II) Nitrate Trihydrate + Salt Weigh out 0.1 mol Cu(NO3)23H2O (MM = 24.6 g/mol) for Solution A. Weigh out 0.2 mol NaCl (MM = 58.44 g/mol) for Solution A = 7 g Prepare Solution A in a 100 mL volumetric flask – add DI water to the mark. Prepare Solutions […]
Question 1 You can use this Excel spreadsheet Download spreadsheet to prepare a graph. Your data points will appear in blue. The “best fit” line will be displayed in red-brown. The spreadsheet will give the best slope estimate, but the average slope calculated using the Data Table in the worksheet is a good estimate. The […]
Part A: Covalent Bonding – How Atoms Share Electrons (13 points) Two atoms form a covalent bond when they share a PAIR of electrons, represented by two dots (:) or a dash (-). In general, each atom contributes one electron to the bond. Hydrogen (H) has just one electron to share, so it can form […]
Procedure – Calorimetry Weigh your candle before and after the experiment! Weigh an aluminum can together with its supporting pencil. Measure approximately 250 mL water; add a small amount of ice to cool it to around 10°C. Transfer the water to the aluminum can and weigh the water + can. This is your calorimeter. Record […]
Procedure and Data for Specific Heat of a Metal Enter the Beyond Labz Calorimetry lab. Click on the Stockroom and select the Dewar flask calorimeter – move it to the front counter. Click on the metal sample case, open a drawer, and move a metal sample to the dish sitting next to the case. Click […]