Historically, the term smog referred to a mixture of smoke and fog, hence the name smog. The industrial revolution has been the central cause for the increase in pollutants in the atmosphere over the last three centuries. Before 1950, the majority of this pollution was created from the burning of coal for energy generation, space…
Phosphates may be created by substituting some or all of the hydrogen of a phosphoric acid by metals. Depending on the number of hydrogen atoms that are replaced, the resulting compound is described as a primary, secondary or tertiary phosphate. Primary and secondary phosphates contain hydrogen and are acid salts. Secondary and tertiary phosphates, with…
Pheromones{fair’-uh-mohn} (from the Greek pher, “to carry” and horman “to stimulate”) are chemicals released by organisms into the environment, where they serve as signals or messages to alter behavior in other organisms of the same species. Pheromones are a class of compounds that insects and animals produce to attract members of their own species. These…
Triatomic oxygen, O3, is most commonly known as ozone. It has a resonance structure, and can be drawn in two different ways: O=O- O-O=O It is a bluish, explosive gas at room temperature, and has a boiling point of -119°C. It has a melting point of -193°C, and is a blue liquid. It’s critical temperature…
Oxygen and its compounds play a key role in many of the important processes of life and industry. Oxygen in the biosphere is essential in the processes of respiration and metabolism, the means by which animals derive the energy needed to sustain life. Furthermore, oxygen is the most abundant element at the surface of the…
Nobelium has the symbol No and is a radioactive metallic element with an atomic number of 102. Nobelium is in the actinide series being labeled as one of the transuranium elements. The element is named after Alfred Bernhard Nobel, the Swedish inventor and philanthropist. Nobelium can be found when produced artificially in a laboratory. Discovery…
In 1909 Robert Andrew Millikan set up an apparatus to measure the charge of an electron within an accuracy range of 3%. In 1913 he came out with a value of the electrical charge that would serve the world of science for a generation. Young Millikan had a childhood like most others: he had no…
Mercury is a metallic element that is a liquid at room temperature; it is one of the transition elements. Mercury’s atomic number is 80. It is superconductive when cooled to within a few degrees of absolute zero. Mercury was once known as liquid silver or quicksilver which was studied by the alchemists. Mercury was first…
On April 23, 1858 Max Karl Ernst Ludwig Planck was born in Kiel, Germany. He was the sixth child of a law professor at the University of Kiel. At the age of nine his interest in physics and mathematics was developed by his teacher Hermann Muller. When he graduated at the age of seventeen he…
LIFE OF MARIE CURIE Marie Curie(1867-1934) was a French physicist with many accomplishments in both physics and chemistry. Marie and her husband Pierre, who was also a French physicist, are both famous for their work in radioactivity. Marie Curie, originally named Marja Sklodowska, was born in Warsaw, Poland on Nov.7, 1867. Her first learning of…
Linus Carl Pauling was born in 1901 and died in 1994. He was an American chemist and physicist, whose investigations into the structure of molecules led to discoveries of how chemicals bond. Pauling was born in Portland, Oregon, on February 28, 1901, and educated at Oregon State College and the California Institute of Technology (Caltech).…
Some materials are so commonplace that we take them for granted. One of those materials is a grayish metal that has been with us for thousands of years. That metal is lead, still one of the world’s most useful substances, and one that never ceases to find a role in human society. Lead has the…
Iron in its pure state is soft, malleable and ductile (that can be stretched, drawn or hammered thin without breaking ((Webster’s Dictionary, 419, 1988)) with a hardness of 4-5. It is easily magnetized at room temperatures and this property disappears when heated above 790 degrees Celsius.. Metal iron occurs in a free state in only…
An ideal gas is a theoretical gas which perfectly fits into the equation PV= nRT. An ideal gas is different from a real gas in many ways. An ideal gases’ mass can be disregarded in the equation because it has none; this is because an ideal gas is said to be a particle and particles…
Production Although Helium is one of the most common elements in the universe it is a rare gas on earth. It exists in the atmosphere in such small quantities (less than five parts per million) that recovering it from the air is uneconomical. Helium is produced as a by-product of the refining of natural gas,…
Gallium, atomic number 31, is very similar to aluminum in its chemical properties. It does not dissolve in nitric acid because of the protective film of gallium oxide that is formed over the surface by the action of the acid. Gallium does however dissolve in other acids, and alkalies. Gallium was discovered (1875) by…
I. Purpose To determine the freezing point of a known substance, naphthalene II. Materials ringstand gas source test tube test tube clamps thermometer naphthalene Bunsen burner goggles hose stopwatch III. Procedure 1. Assemble the Bunsen burner, attaching one end of the hose to the burner and the other to a gas source. 2. Assemble the…
The Frank J. horgan Filtration Plant is located Southeast of Toronto on the shores of Lake Ontario (See map). Its purpose is to provide safe drinking water to our taps by filtering the water. The water is gathered from Lake Ontario. This plant has a production capacity of 455 million litres per day to supply…
Purpose In this lab we will observe the products of decomposition of potassium perchlorate (KClO4). We will then predict from our results the correct chemical reaction equation. Procedure 1. Weigh out about 4.0g of KClO4 in a test tube. Record the accurate weight below. Product Weight Before Weight After Mass of Test tube + KClO4 …
Copper is a mineral. It is not a plant or an animal. Copper is a metallic metal. It can never be broken down into different substances by normal chemical means. Copper was one of the first metals known to humans. People liked it because in its native condition, it could easily be beaten into weapons…
