Born 22 June 1939 in the Guela quarter in Jerusalem, Ada Yonath is the oldest daughter of Hillel and Esther Livshitz. At that time, the area of Palestine was under British control. World War I left Palestine and other territories of the freshly defeated Ottoman Empire in limbo. The 1920 document issued by the League … Continue reading Profile: Ada E. Yonath
STEM
Profile: Iréne Joliot-Curie
Iréne Curie was born on September 12, 1897 in Paris, France to Marie and Pierre Curie. She was the oldest of two, her younger sister Eve being born in 1904. Iréne grew up to be a bright, smart, and quick young woman. Marie and Pierre would be awarded the 1903 Nobel prize in physics alongside Henri … Continue reading Profile: Iréne Joliot-Curie
Episode 5b: Combustion Reactions
Episode 5B: Combustion Reactions This episode is on FIRE! All about combustion reactions and the information we can gain from them. Misspeak at ~5:57, should be grams hydrogen. Music: Good For You by THBD https://soundcloud.com/thbdsultan Creative Commons — Attribution 3.0 Unported— CC BY 3.0 http://creativecommons.org/licenses/b... Music provided by Audio Library https://youtu.be/-K_YSjqKgvQ Find us at … Continue reading Episode 5b: Combustion Reactions
Determining the Molar Solubility of Iron (II) Hydroxide
Given Question: Calculate the molar solubility of Fe(OH)2 (Ksp=4.87*10^-7). Tutor's Note: The Ksp radical that's written down comes in later, I got confuzzled by my own notes! Happens to all of us. Sorry students 🙂 Step 1: Write out the reaction equation with all ions. Make sure it's balanced! We'll use this in the next step with … Continue reading Determining the Molar Solubility of Iron (II) Hydroxide
Profile: Ruby S. Hirose
Ruby S. Hirose- an unsung northwest powerhouse who contributed to the polio vaccine among many other accomplishments.
Profiles: George Washington Carver
George Washington Carver was born in Diamond, MO, in 1864/5, though the real date is unknown. Born into slavery, Carver’s parents Giles and Mary were owned by a German immigrant slaveholder Moses Carver. At the conclusion of the civil war, Moses Carver and his wife Susan decided to keep George and his brother James. Susan … Continue reading Profiles: George Washington Carver
Calculating the pH of a Buffer System
The point of this problem is to correctly calculate the pH of a buffer system using formonitrile, or hydrogen cyanide. Here, we use the dissociation constant and the Henderson-Hasselbach equation. Given Problem: Calculate the pH of a buffer that's .250 M HCN (kª= 4.9*10^-10) and 0.170 M KCN. 2. This is to remind us of the … Continue reading Calculating the pH of a Buffer System
Calculating Percent Yield
Given Question: 155.8 Kg of SiO2 reacts with 78.3 Kg of Carbon to produce 66.1 Kg of silicon. What is the percent yield of the reaction? 1. The first step is to convert your given masses into moles. This way, you can see which reactant is in excess and which one is limiting. A good … Continue reading Calculating Percent Yield
Percent Mass Composition Example
The point of these problems is to calculate the mass of a specific element in a given compound. We're given 88.07 grams of C4H8S, and the molar mass of sulfur is 32.07 grams/mol. We know that the % mass composition is found by dividing the molar mass of our target element by the total mass … Continue reading Percent Mass Composition Example
Hey Chemistry 