http://www.chemistry-help.info http://www.chemistry-help.info/Alkanes.html What are alkanes? The Alkanes are a homologous series of saturated hydrocarbons with the general formula. http://www.chemistry-help.info/Alkanes.html http://www.chemistry-help.info/Dalton's_Law_of_Partial_Pressure.html The next important law concerning gases is Dalton's Law of Partial Pressure. The formula and mathematical equation for Dalton's Law of Partial Pressure is given below along with definition of partial pressure. http://www.chemistry-help.info/Dalton's_Law_of_Partial_Pressure.html http://www.chemistry-help.info/Boyle's_Law_Charles_Law_Related.html People often ask about how Boyles Law and Charles Law are related. Boyle's Law and Charles Law can be combined in a general gas equation. The equation that relates Boyle's Law and Charles Law is given below. http://www.chemistry-help.info/Boyle's_Law_Charles_Law_Related.html http://www.chemistry-help.info/Charles_Law.html Charles Law is often introduced after Boyles Law in Chemistry. Below is an explanation of Charles Law including the relationship between Charles Law and Boyles Law. http://www.chemistry-help.info/Charles_Law.html http://www.chemistry-help.info/Boyle's_Law.html In Chemistry, Boyles law is used to solve for pressure. Boyle's Law is one of the first law studied in school chemistry when learning about gases. Below is the equation for Boyles Law as well as the definition of Boyles Law. http://www.chemistry-help.info/Boyle's_Law.html http://www.chemistry-help.info/Chemical_Equations.html Chemical equations are widely used in chemistry textbooks and are often tested in chemistry exams. Knowing chemical equations is key and understanding how to balance chemical equations is critical in passing a chemistry examination. http://www.chemistry-help.info/Chemical_Equations.html http://www.chemistry-help.info/Enthalpy.html Many enthalpies of chemical reaction have been measured and tabulated. Hess's Law states that if a reaction is carried out in a series of steps. http://www.chemistry-help.info/Enthalpy.html http://www.chemistry-help.info/Basic_forces.html There are four basic forces or interactions known in nature. Gravitational forces or gravity act between all objects in proportion to their masses. http://www.chemistry-help.info/Basic_forces.html http://www.chemistry-help.info/Density_Formula.html Today we are going to discuss the formula of Density which is very often used in chemistry or physics. First of all, let us define what density is. http://www.chemistry-help.info/Density_Formula.html http://www.chemistry-help.info/Density.html What is density? Density is defined as the amount of mass in a unit volume of the substance. http://www.chemistry-help.info/Density.html http://www.chemistry-help.info/SI_units.html In order to simplify and modernize the metric system, an international agreement was reached in 1960 specifying a particular choice of metric units for use in scientific measurements. http://www.chemistry-help.info/SI_units.html http://www.chemistry-help.info/Scientific_method.html The scientific method is a general approach to problems that involves making observations, seeking patterns in the observations, formulating hypotheses to explain the observations, and testing these hypotheses by further experiments. http://www.chemistry-help.info/Scientific_method.html http://www.chemistry-help.info/Diagram_of_an_Atom.html The basic diagram of an atom is drawn very easily. Below are basic parts of an atom diagram showing the chemical element and electrons. http://www.chemistry-help.info/Diagram_of_an_Atom.html http://www.chemistry-help.info/Structural_isomers.html Structural isomers of hydrocarbon. Structural isomers differing in functional groups. http://www.chemistry-help.info/Structural_isomers.html http://www.chemistry-help.info/Isomers.html Isomers are compounds that have the same number and types of atoms. Isomers have the same molecular formula but differ in the way they are combined with each other. http://www.chemistry-help.info/Isomers.html http://www.chemistry-help.info/Covalent_Bonds.html Covalent bond is one of the main types of chemical bonds. The simplest covalent bond is within a hydrogen molecule (H2). http://www.chemistry-help.info/Covalent_Bonds.html http://www.chemistry-help.info/Types_of_Chemical_Bonds.html The most basic types of chemical bonds are ionic chemical bonds and covalent chemical bonds. Six types of chemical bonds are discussed. http://www.chemistry-help.info/Types_of_Chemical_Bonds.html http://www.chemistry-help.info/Nitrogen_Trichloride_Balanced_Equations.html Below are nitrogen trichloride balanced equations. Nitrogen trichloride (NCl3) is formed when excess chlorine reacts with ammonia. Usually nitrogen forms only a single chloride. http://www.chemistry-help.info/Nitrogen_Trichloride_Balanced_Equations.html http://www.chemistry-help.info/Sulfuric_Acid.html Below is a video showing Sulfuric Acid formula and many properties of Sulfuric Acid. Sulfuric acid is sometimes written as sulphuric acid. Sulfuric acid has many uses in the chemical industry. http://www.chemistry-help.info/Sulfuric_Acid.html http://www.chemistry-help.info/Polysaccharides.html http://www.chemistry-help.info/Polysaccharides.html http://www.chemistry-help.info/Disaccharides.html Definition of disaccharides. Disaccharides are a form of sugar, a carbohydrate, created by linking a pair of monosaccharides. Monosaccharides are simple sugars. http://www.chemistry-help.info/Disaccharides.html http://www.chemistry-help.info/Monosaccharides.html Monosaccharides are simple sugar such as fructose or glucose that cannot be decomposed by hydrolysis. Monosaccharides are colorless crystalline substances with a sweet taste. http://www.chemistry-help.info/Monosaccharides.html http://www.chemistry-help.info/Sugar.html Sugar is also called saccharides. All sugar are carbohydrates but not all carbohydrates are called sugar. Examples of carbohydrates that are not sugar are starch and cellulose. http://www.chemistry-help.info/Sugar.html http://www.chemistry-help.info/Sodium_Chloride.html Sodium Chloride in chemistry is the name for common table salt. Sodium chloride is one of the most common chemical compounds that is part of everyday items used in households. http://www.chemistry-help.info/Sodium_Chloride.html http://www.chemistry-help.info/Potassium_Dichromate.html Below is a video introduction to Potassium Dichromate. The chemical compound Potassium Dichromate is a compound of Potassium, Chromium, and Oxygen. Below is the formula for Potassium Dichromate. http://www.chemistry-help.info/Potassium_Dichromate.html http://www.chemistry-help.info/Manganese_Dioxide.html The video below shows facts and chemical properties of Manganese dioxide or Manganese oxide or Manganese IV oxide. http://www.chemistry-help.info/Manganese_Dioxide.html http://www.chemistry-help.info/Copper_II_Sulfate.html Copper Sulfate or Copper II Sulfate is a substance that is usually found as a blue, crystalline hydrated salt. The elements in Copper II Sulfate are Copper, Oxygen, Hydrogen, and sulphur. http://www.chemistry-help.info/Copper_II_Sulfate.html http://www.chemistry-help.info/Copper_Oxide.html Copper Oxide or Copper II Oxide is a black solid. The video below shows the introduction, chemical properties and facts about Copper II Oxide. http://www.chemistry-help.info/Copper_Oxide.html http://www.chemistry-help.info/Copper_Carbonate.html Copper Carbonate or Copper II Carbonate is a green solid that readily decomposes to form black copper II oxide on heating. http://www.chemistry-help.info/Copper_Carbonate.html http://www.chemistry-help.info/Carbonic_Acid.html Carbonic acid is a chemical compound of carbon, oxygen and hydrogen or carbon dioxide and water. Carbonic acid is a weak, dibasic acid, unlike hydrochloric acid of sulphuric acid. http://www.chemistry-help.info/Carbonic_Acid.html http://www.chemistry-help.info/Calcium_Oxide.html Calcium Oxide is a chemical compound of calcium and oxygen. The common name for Calcium oxide is Quicklime. The video below shows facts and chemical properties. http://www.chemistry-help.info/Calcium_Oxide.html http://www.chemistry-help.info/Calcium_Hydroxide.html Below is a video explaining facts and chemical properties and definition of Calcium Hydroxide. Calcium Hydroxide is sometimes called Slaked Lime. http://www.chemistry-help.info/Calcium_Hydroxide.html http://www.chemistry-help.info/Calamine.html The video below gives facts and chemical properties of the chemical compound called Calamine. Calamine is the common name of the chemical compound Zinc Carbonate which is an ore of Zinc (Zn). http://www.chemistry-help.info/Calamine.html http://www.chemistry-help.info/Aluminum_Hydroxide.html Below is a video explaining facts and chemical properties and definition of Aluminum Hydroxide. The video also shows Aluminum hydroxide reaction. Aluminum Hydroxide is sometimes called Alumina. http://www.chemistry-help.info/Aluminum_Hydroxide.html http://www.chemistry-help.info/Chemical_Compounds.html Below is a list of chemical compounds. The list of chemical compounds starts with common chemical compounds. The chemical formula for compounds is different for each chemical compound. http://www.chemistry-help.info/Chemical_Compounds.html http://www.chemistry-help.info/Element_Xenon.html Below is a video of the chemical element Xenon, an introduction to Chemistry. The chemical element Xenon is one of the inert gases or noble gases. http://www.chemistry-help.info/Element_Xenon.html http://www.chemistry-help.info/Element_Tungsten.html Below is a video showing the element Tungsten. The chemical element Tungsten has the chemical symbol W in the Periodic Table. http://www.chemistry-help.info/Element_Tungsten.html http://www.chemistry-help.info/The_Element_Tin.html The element Tin in chemistry has the symbol Sn. The element tin (Sn) 's atomic number is 50. The atomic weight of the element tin (Sn) is 118.710. http://www.chemistry-help.info/The_Element_Tin.html http://www.chemistry-help.info/Tellurium.html The chemical element Tellurium is shown in the periodic table with symbol Te. Below is a video showing an introduction to this chemical element Tellurium. http://www.chemistry-help.info/Tellurium.html http://www.chemistry-help.info/Technetium_Element.html The Technetium element has a chemical symbol Tc and Technetium is number 43 in the Periodic table of chemical elements. Below is a video showing basic introduction to Technetium element. http://www.chemistry-help.info/Technetium_Element.html http://www.chemistry-help.info/The_Element_Tantalum.html The element Tantalum is a chemical element with symbol Ta. The video below shows facts about the element Tantalum, as well as the history and chemical properties of the chemical element Tantalum. http://www.chemistry-help.info/The_Element_Tantalum.html http://www.chemistry-help.info/Sulfur.html Sulfur is the chemical element with the symbol S. The chemical element Sulfur is number 16 in the Periodic table of elements. Sulfur has many uses. http://www.chemistry-help.info/Sulfur.html http://www.chemistry-help.info/Element_Ruthenium.html The chemical element Ruthenium is element number 44 in the Periodic table of elements. The chemical symbol for the element Ruthenium is Ru. http://www.chemistry-help.info/Element_Ruthenium.html http://www.chemistry-help.info/Rhodium.html Below is a video with an introduction to the chemical element Rhodium, Rh. The chemical element Rhodium (Rh) has atomic number of 45. Rhodium compounds have many uses. http://www.chemistry-help.info/Rhodium.html http://www.chemistry-help.info/Rhenium.html The chemical element Rhenium is number 75 in the Periodic Table. The chemical symbol of the element Rhenium is Re. http://www.chemistry-help.info/Rhenium.html http://www.chemistry-help.info/Element_Radon.html The element Radon is number 86 in the periodic table of elements. The Radon video below shows interesting facts about the element Radon as well as the history of Radon the element. http://www.chemistry-help.info/Element_Radon.html http://www.chemistry-help.info/Palladium_Element.html The chemical element Palladium has chemical symbol Pd. The video below shows an introduction to the element Palladium including some basic properties of Palladium. http://www.chemistry-help.info/Palladium_Element.html http://www.chemistry-help.info/Osmium_Element.html The element Osmium of the Periodic Table is number 76. The chemical symbol for Osmium 76 element is Os. The video below shows facts about Osmium, where is Osmium found, uses of Osmium, and who discovered Osmium. http://www.chemistry-help.info/Osmium_Element.html http://www.chemistry-help.info/Meitnerium_Element.html Meitnerium is the chemical element number 109. The video below gives an introduction to the element Meitnerium. http://www.chemistry-help.info/Meitnerium_Element.html http://www.chemistry-help.info/Element_Lead.html The element Lead (pronounced 'Led') is number 82 in the periodic table of elements. The chemical Pb stands for Lead element. http://www.chemistry-help.info/Element_Lead.html http://www.chemistry-help.info/Lanthanum.html Lanthanum is a special chemical element. The video below shows the properties and basic facts of the chemical element Lanthanum, as well as abit of Lanthanum history. http://www.chemistry-help.info/Lanthanum.html http://www.chemistry-help.info/Element_Iridium.html The chemical element Iridium is number 77 in the Periodic Table of elements. The chemical symbol for the element Iridium is Ir. http://www.chemistry-help.info/Element_Iridium.html http://www.chemistry-help.info/Indium_the_Element.html Indium is the chemical element with the symbol In. The video below shows an introduction to the Indium, the element with atomic number 49 on the Periodic table. http://www.chemistry-help.info/Indium_the_Element.html http://www.chemistry-help.info/Iodine.html Iodine is a chemical element of many uses. White iodine or white decolorized iodine, for example, have gained much attention in the beauty industry. http://www.chemistry-help.info/Iodine.html http://www.chemistry-help.info/Hassium_Element.html The element Hassium from the periodic table is another synthesized radioactive element. Hassium is number 108 in the periodic table of elements. http://www.chemistry-help.info/Hassium_Element.html http://www.chemistry-help.info/Halfnium_Element.html The video below gives facts about Hafnium the element number 72 in the Periodic Table of elements. The chemical element Hafnium has chemical symbol Hf. http://www.chemistry-help.info/Halfnium_Element.html http://www.chemistry-help.info/Element_Gold.html Below is a video with interesting facts about the element Gold. The video includes a brief history of element gold and who discovered the element Gold. http://www.chemistry-help.info/Element_Gold.html http://www.chemistry-help.info/Cesium.html Cesium or Cs is a chemical element with atomic number of 55. Among well known Cesium compounds is Cesium Chloride which is used in the Cesium cancer therapy. http://www.chemistry-help.info/Cesium.html http://www.chemistry-help.info/Element_Cadmium.html The chemical symbol for the element Cadmium is Cd. The video below shows an introduction to the chemical element Cadmium (Cd). http://www.chemistry-help.info/Element_Cadmium.html http://www.chemistry-help.info/Boron.html The element Boron is number 5 in the Periodic table of elements. Below is a chemistry help video on the element Boron, including many facts about Boron (B), chemical properties as well as history and discovery of the element Boron. http://www.chemistry-help.info/Boron.html http://www.chemistry-help.info/Barium_Element.html http://www.chemistry-help.info/Barium_Element.html http://www.chemistry-help.info/Antimony_Element.html The chemical symbol of element Antimony is Sb. Below is a video introduction to Antimony element (Sb) and facts about Antimony element. http://www.chemistry-help.info/Antimony_Element.html http://www.chemistry-help.info/Nitrogen_Element.html The chemical symbol for the element Nitrogen is N. Nitrogen is the element number 7 in the periodic table of elements. Below is a video showing interesting facts on the element Nitrogen. There are many uses of the element Nitrogen. http://www.chemistry-help.info/Nitrogen_Element.html http://www.chemistry-help.info/Fractional_Distillation.html Small amounts of nitrogen, usually for student experiments, can be prepared by combining and gently warming a mixture of ammonium and nitrate salts. http://www.chemistry-help.info/Fractional_Distillation.html http://www.chemistry-help.info/Nitrogen.html Nitrogen oxide or laughing gas is found among the gases in the earth 's atmosphere. Nitrogen is one of the most abundant elements in the cosmos. http://www.chemistry-help.info/Nitrogen.html http://www.chemistry-help.info/Interesting_Facts_About_Hydrogen.html Below is a video of interesting facts about hydrogen, the element with atomic number 1 on the Periodic table. Hydrogen has the chemical symbol H. Below are some facts about Hydrogen. http://www.chemistry-help.info/Interesting_Facts_About_Hydrogen.html http://www.chemistry-help.info/Markownikoff_rule.html In the addition of hydrogen halides to unsymmetrically constituted (unsaturated) hydrocarbons, the halogen atom becomes attached to the carbon bearing the lesser number of hydrogen atoms. http://www.chemistry-help.info/Markownikoff_rule.html http://www.chemistry-help.info/Hydrides.html Hydrides are compounds composed of two different elements, one of them being hydrogen. The following summary is brief and hardly begins to indicate the extent of the world of hydrides. http://www.chemistry-help.info/Hydrides.html http://www.chemistry-help.info/Hydrogen_Properties.html Hydrogen is chemically unique in a number of ways. Among these unique features is Hydrogen 's ability to form compounds by giving up an electron or acquiring one. http://www.chemistry-help.info/Hydrogen_Properties.html http://www.chemistry-help.info/Hydrogen_Atom.html The hydrogen atom is the simplest atom that can possibly exist. Its most common isotope is composed of a single proton and an electron. If you take away either of these parts, you no longer have an atom at all. http://www.chemistry-help.info/Hydrogen_Atom.html http://www.chemistry-help.info/Hydrogen.html Hydrogen is the nuclear fuel consumed by the sun and other stars to produce energy. Although, 70% of the universe is composed of hydrogen, hydrogen constitutes only 0.87% of the earth 's mass. http://www.chemistry-help.info/Hydrogen.html http://www.chemistry-help.info/Ozone.html Ozone is a very strong oxidizing agent that is capable of adding an oxygen molecule to stable ions. Ozone is a pale blue gas with a sharp, irritating odor. Ozone is poisonous. http://www.chemistry-help.info/Ozone.html http://www.chemistry-help.info/Importance_of_Oxygen.html Oxygen is very important. Oxygen is absolutely vital for sustaining life as we know it. The oxygen atom is one of the most abundant atomic species in the cosmos. http://www.chemistry-help.info/Importance_of_Oxygen.html http://www.chemistry-help.info/Oxygen_Production.html Most commercially produced oxygen is consumed by the steel industry. Pure oxygen is blown over the molten steel where it converts excess carbon to carbon dioxide gas and oxidizes other impurities so they can later be removed with the slag. http://www.chemistry-help.info/Oxygen_Production.html http://www.chemistry-help.info/History_of_Oxygen.html The history of oxygen starts with Leonardo da Vinci. In the past, air was believed to be an elemental substance. Now we know that it is not. Air is composed of a number of different elemental gasses. http://www.chemistry-help.info/History_of_Oxygen.html http://www.chemistry-help.info/Oxygen.html Oxygen is the most abundant element by mass both in the earth 's crust and in the human body. Oxygen constitutes 89% of water by mass. http://www.chemistry-help.info/Oxygen.html http://www.chemistry-help.info/The_Element_Carbon.html The element Carbon has the chemical symbol C. Carbon is the element number 6 in the Periodic table of elements. http://www.chemistry-help.info/The_Element_Carbon.html http://www.chemistry-help.info/Carbon_14.html Radioactive carbon 14 is a well known tool for determining the age of geological specimens and archeological artifacts. The procedure, known as carbon 14 dating or radiocarbon dating. http://www.chemistry-help.info/Carbon_14.html http://www.chemistry-help.info/Carbon_Monoxide.html Carbon monoxide is best known as a toxic gas that is generated by the incomplete combustion of hydrocarbon fuels, including natural gas and gasoline. The chemical element symbol of Carbon Monoxide is simply CO. http://www.chemistry-help.info/Carbon_Monoxide.html http://www.chemistry-help.info/Carbon_Properties.html Carbon combines very slowly with oxygen at room temperatures. At moderately high temperatures, however, carbon combines with oxygen quite readily. http://www.chemistry-help.info/Carbon_Properties.html http://www.chemistry-help.info/Carbon_Dioxide.html Carbon dioxide is the most common carbon compound. Two carbon compounds, carbon dioxide and methane, are among the gasses commonly found in the earth's atmosphere. http://www.chemistry-help.info/Carbon_Dioxide.html http://www.chemistry-help.info/Carbon.html Carbon is a chemical element number 6 in the periodic table. The symbol of Carbon is C. The atomic weight of Carbon is 12.011 and the melting point of Carbon is 3550 degree celcius. http://www.chemistry-help.info/Carbon.html http://www.chemistry-help.info/Chemical_Elements.html There are many chemical elements known. Below are the start of our chemistry help resources. Check back on our Chemistry Help information website regularly for more information on other Chemical elements. http://www.chemistry-help.info/Chemical_Elements.html http://www.chemistry-help.info/Important_Values_Constants_and_Standards.html The table of important values, constants and standards below are often used in school chemistry. http://www.chemistry-help.info/Important_Values_Constants_and_Standards.html http://www.chemistry-help.info/Standard_Electrode_and_Redox_Potentials.html Below is a table to Standard Electrode and Redox Potentials at 298K or 25 degrees centigrade). This table is used in A-level chemistry. http://www.chemistry-help.info/Standard_Electrode_and_Redox_Potentials.html http://www.chemistry-help.info/What_is_a_Buffer_Solution.html Before we discuss different types of buffer solutions, let's define what a buffer solution is. Then we will briefly explain how to make different buffer solutions. http://www.chemistry-help.info/What_is_a_Buffer_Solution.html http://www.chemistry-help.info/Specific_Gravity.html Below are common questions on specific gravity. The answers to these specific gravity questions are shown below. http://www.chemistry-help.info/Specific_Gravity.html http://www.chemistry-help.info/Law_of_Definite_Proportions.html Below are common questions regarding the Laws of Definite Proportions. The answers to the law of definite proportions questions are shown below. http://www.chemistry-help.info/Law_of_Definite_Proportions.html http://www.chemistry-help.info/Chemistry_Help.html Below are various topics in Chemistry to help you understand Chemistry. Click on the appropriate chemistry help section to read more. http://www.chemistry-help.info/Chemistry_Help.html http://www.chemistry-help.info/index.html Chemistry Help website is dedicated to providing information on Chemistry and Chemical elements. Chemistry Help is an informational resource website for students of Chemistry. http://www.chemistry-help.info