Profile: Amadeo Avogadro

Lorenzo Romano Amedeo Carlo Avogadro, conte di Quaregna e Cerreto or as we know him, Amedeo Avogadro, was born on August 9th, 1776 in Turin, Italy. His father, a lawyer turned senator in Italy, Avogadro began his education in the pursuit of law. Avogadro earned his law degree in 1792, but did not start practicing … Continue reading Profile: Amadeo Avogadro

VSEPR Theory Examples (chem.purdue)

Given Problem: Draw the Lewis dot structures, identify the molecular geometry, and give the bond angle for the following compounds: BeF2 BCl3 SI6 1. BeF2: The first step is to draw the Lewis dot structure. This can be done by identifying how many bonding groups are involved.  A bonding group, counts as 1 lone electron, an electron pair, … Continue reading VSEPR Theory Examples (chem.purdue)

Balancing Equations (Chem.libretext example)

The point of this exercise is to practice balancing reactions. Many students get overwhelmed when they face having to balance equation usually because it's hard to determine where to start. Given Problem: Lead (IV) Hydroxide and sulfuric acid react as: Pb(OH)4+H2SO4→ Pb(SO4)2+H2O Balance the equation: 1. The first step to balancing a chemical reaction is to identify … Continue reading Balancing Equations (Chem.libretext example)

Profile: Antoine Lavoisier

Antoine Lavoisier (1743-1794) was a pioneer of modern chemistry. Born in Paris, France, in 1743, Lavoisier enjoyed a privileged life as the son of a prominent lawyer. His mother died when he was five years old and left a good amount of money for him. He studied at Collège des Quatre-Nations of the University of Paris between … Continue reading Profile: Antoine Lavoisier

Profile: Sir Ernest Rutherford

Ernest Rutherford (1871-1937) was born in New Zealand to James and Martha Rutherford. He had a quiet childhood complemented by a better education than most kids living in the New Zealand countryside. In 1887 Rutherford won a scholarship to Nelson Collegiate School - at that time it was the only scholarship available to help students attend … Continue reading Profile: Sir Ernest Rutherford

Profile: Dmitri Mendeleev

Dmitri Mendeleev (1834-1907) was born in Verkhnie Aremzyani, Siberia and moved to St. Petersburg at age 16 to enroll in university studies. His father died at age 13, leaving him, his mother, and as many as 11-17 siblings behind (reports vary). While at university Mendeleev flourished as a chemist and graduated top of his class. He earned … Continue reading Profile: Dmitri Mendeleev

Determining the Density of a Face-Centered Aluminum Cell

Crystals come in unique shapes, but all usually have an organized, repeating structure known as a lattice. For more information about metal lattices check out:  Given Problem: An aluminum crystal has a face-centered unit cell. An aluminum atom has a radius of 143 picometers. What is the density of the solid crystal aluminum in g/cm³?  … Continue reading Determining the Density of a Face-Centered Aluminum Cell

Gas Volume Stoichiometry Problem

Given Problem: Methanol (CH3OH) can be synthesized as: CO+2H2→CH3OH. What volume in liters of H2(g) is needed to make 35.7 grams of CH3OH?  1. We are given the temperature at 355 K and the pressure is 738 mmHg. 2.  First, you must convert the target mass of CH3OH to moles. To do this, you use the molar mass … Continue reading Gas Volume Stoichiometry Problem