Essays Tagged: "Chemical reaction"

Chemical reactions

Chemical reactions are the heart of chemistry. People have always known that they exist. The Ancient ... in the Seventeenth Century, a German chemist named Georg Ernst Stahl was the first to postulate on chemical reaction, specifically, combustion. He said that a substance called phlogiston escaped into ... ry Antoine-Laurent Lavoisier, in France, discovered an important detail in the understanding of the chemical reaction combustion, oxigine (oxygen). He said that combustion was a chemical reaction invo ...

(8 pages) 210 0 4.1 Mar/2002

Subjects: Science Essays > Chemistry

Analytical Chemistry

Analytical Chemistry is the branch of chemistry principally concerned with determining the chemical composition of materials, which may be solids, liquids, gases, pure elements, compounds, or ... s, which may be solids, liquids, gases, pure elements, compounds, or complex mixtures. In addition, chemical analysis can characterize materials but determining their molecular structures and measurin ...

(4 pages) 116 0 4.1 Jan/1996

Subjects: Science Essays > Chemistry

The Quicksilver

. He called several of his colleagues over to admire it. It was passed down through the years, this chemical reaction, that formed this 'Quicksilver' as the alchemists called it. One day a French chem ...

(1 pages) 33 0 4.0 Oct/1996

Subjects: Science Essays > Chemistry

To investigate the factors that affect a chemical reaction: Calcium Carbonate + Hydrochloric Acid Calcium Chloride + Carbon Dioxide

PlanI have to investigate the factors that affect a chemical reaction:Calcium Carbonate + Hydrochloric AcidCalcium Chloride + Carbon DioxideThe easiest ... of 'Chemistry in Context' by G. Hill and J. Holman I alreadyknow the following information.During a chemical reaction the reactants are converted to products. The reaction rate tells us how fast the r ... .Biological reactions rely on the presence of catalysts. One or more catalysts control almost every chemical reaction in your body. Catalysts are involved in simple reactions like the hydrolysis of st ...

(7 pages) 78 0 3.0 Nov/2002

Subjects: Science Essays > Chemistry

Barium chloride plus silver nitrate equals silver chloride and barium nitrate

ses. The 1.0M silver nitrate solution is placed in with the distilled water and anhydrous salt so a chemical reaction can occur. The new solution is heated to be sure that the chemical reaction is com ... ed with distilled water. That solution was added to a solution of silver nitrate and then heated. A chemical reaction occurred that caused a precipitate to form in the solution and settle at the botto ...

(2 pages) 54 1 3.7 Apr/2003

Subjects: Science Essays > Chemistry

The Ozone Layer: What Does It Do And What Happens When It's Gone?

is essential in order for life to exist on the Earth. Ozone is a colorless gas that is formed by a chemical reaction of oxygen molecules, oxygen atoms, and solar radiation. Contrary to popular belief ... mmon in homes, playgrounds, and other structures.These holes in the ozone layer are being caused by chemicals that have been released into the atmosphere. The most common are chlorofluorocarbons, whic ...

(5 pages) 73 0 5.0 Apr/2003

Subjects: Science Essays > Earth Sciences > Meteorology

Chem Lab, do ions combine in definite ratios.

e in definite ratios due to the fact that the valance electrons will not be changing throughout any chemicals; consequently the ions must combine in definite ratios.EXPERIMENTAL DESIGNA technique is p ... ate and sodium carbonate are placed together in various test tubes, with various quantities of each chemical and a chemical reaction should happen. The time for the two chemicals to completely react i ...

(3 pages) 29 0 3.0 May/2003

Subjects: Science Essays > Chemistry

True Self.

. She made herself a tub of lukewarm water and dropped a few drops of bathing perfume. An immediate chemical reaction aroused an oleander-scent, inhibiting the entire bathroom. She submerged her body ...

(2 pages) 84 2 3.9 Jul/2003

Subjects: Literature Research Papers > Creative Writing > Poems & Short Stories

Chemestry on sodiumthiosulphate turning hydrochloric acid milk.

obtaining the reaction rate between sodium thiosulphate and hydrochloric acid?The average rate of a chemical reaction, over a certain time, is equal to the change in concentration of the reactant or t ... s defined as the speed at which the reaction takes place.Most molecular collisions do not result in chemical change. Before any change takes place on collision, the colliding molecules must have a min ...

(12 pages) 40 0 3.0 Jul/2003

Subjects: Science Essays

Photosynthesis.

plants for food. The method plant use to produce food is called photosynthesis.Photosynthesis is a chemical reaction and it can be written down as a word equation:Carbon Dioxide + Water (Light energy ... chloroplasts in a leaf, it is trapped by the chlorophyll, which then makes the energy available for chemical reactions in the plant. Thus, as the amount of sunlight, or in this case light from a bulb, ...

(4 pages) 136 0 3.4 Oct/2003

Subjects: Science Essays > Biology > Plant Biology

Investigating the affect of concentration on the rate of reaction.

the affect of concentration on the rate of reactionIntroduction:This investigates how the rate of a chemical reaction depends on the concentration of reactants in the solution. This will be investigat ...

(5 pages) 65 1 1.8 Oct/2003

Subjects: Science Essays > Chemistry

Chemical reations is an essay on chemical reactions in Chemistry.

Chemical ReactionsChemical reactions are the heart of chemistry. People have always known that they ... in the Seventeenth Century, a German chemist named Georg Ernst Stahl was the first to postulate on chemical reaction, specifically, combustion. He said that a substance called phlogiston escaped into ... ry Antoine-Laurent Lavoisier, in France, discovered an important detail in the understanding of the chemical reaction combustion, oxigine (oxygen). He said that combustion was a chemical reaction invo ...

(8 pages) 124 2 4.5 Nov/2003

Subjects: Science Essays > Chemistry

The Hindenburg Disaster

been sustained by evidence.The explosion that destroyed the Hindenburg was caused by the following chemical reaction:Airships are now filled with Helium the second lightest gas known to man. Helium i ...

(1 pages) 21 0 4.3 Dec/2003

Subjects: History Term Papers

GCSE Chemistry - Sodium Thiosulphate Coursework

e rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the reaction to take place. Th ...

(10 pages) 83 1 4.1 Jan/2004

Subjects: Science Essays > Chemistry

The Chemistry of Food and Cooking : Eggs.

In cooking, everything is chemistry! Whether you knead bread, bake a pie, or roast a meat, chemical reaction is taking place. Not only with these foods, but with others such as eggs. Egg prot ... s in an egg white are twisted, folded, and curled up into a circular shape. Different kinds of weak chemical bonds keep the protein curled up tight in the water that surrounds it.When you apply heat a ...

(3 pages) 77 0 4.1 Jan/2004

Subjects: Science Essays > Chemistry

Rates of reaction between magnesium ribbons and hydrochloric acid. GCSE coursework.

, magnesium is one of the alkaline earth metals. The atomic number of magnesium is 12.The rate of a chemical reaction is a measure of how fast the reaction takes place. It is important to remember tha ... t with hydrochloric acid, because it is higher in the reactivity series that hydrogen. When the two chemicals react, a displacement reaction will take place and the magnesium will displace the hydroge ...

(6 pages) 119 2 4.5 Mar/2004

Subjects: Science Essays > Chemistry

An investigation into the effect of substrate concentration on the activity of the enzyme catalase in potato tissue.

l Catalysts. The definition of a catalyst is a substance that can be used to speed up the rate of a chemical reaction while remaining unaffected and unchanged after the reaction. The enzyme's ability ...

(10 pages) 77 1 4.7 Mar/2004

Subjects: Science Essays

Investigation: How does channging the concentration of a substance affect the rate of reaction?

A chemical reaction is the process by which atoms or groups of atoms are redistributed, resulting in a ... o occur, the reactant particles must collide. Only a certain fraction of the total collisions cause chemical change; these are called fruitful collisions. The fruitful collisions have enough energy at ...

(7 pages) 45 0 3.7 May/2004

Subjects: Science Essays > Chemistry

The combustion of Alcohols investgation: Investigate the heat energy in a range of alcohol's used as fuels.

in a molecule there are bond energies that are holding the atoms together. When the fuel combusts a chemical reaction takes place, this breaks the bonds, this requires energy, and makes new bonds this ... 02C - H 435C - C 347H - O 464C = O 805If we draw out the structure of each molecule involved in the chemical reaction we can easily find out how much energy is in that molecule.STRUCTURE OF THE MOLECU ...

(5 pages) 36 0 3.0 May/2004

Subjects: Science Essays > Chemistry

Pasteur

of the school of science at the University of Lisle.Pasteur saw that fermentation was not a simple chemical reaction, but took place only in the presence of living organisms.In 1857 Pasteur published ...

(1 pages) 31 1 3.8 Jun/2004

Subjects: History Term Papers > North American History