Reversible and irreversible reactions - Chemwiki
... It is a common observation that most of the reactions when carried out in closed vessels do not go to completion, under a given set of conditions of temperature and pressure. In fact in all such cases, in the initial state, only the reactants are present but as the reaction proceeds, the concentrati ...
... It is a common observation that most of the reactions when carried out in closed vessels do not go to completion, under a given set of conditions of temperature and pressure. In fact in all such cases, in the initial state, only the reactants are present but as the reaction proceeds, the concentrati ...
Chapter 3: Stoichiometry
... reactants and products of a reaction are determined by experimental observation. The formulas of the compounds must never be changed in balancing a chemical equation. 3.8: Stoichiometric Calculations The first step is to balance the equation. Next, convert the known mass of the reactant or product t ...
... reactants and products of a reaction are determined by experimental observation. The formulas of the compounds must never be changed in balancing a chemical equation. 3.8: Stoichiometric Calculations The first step is to balance the equation. Next, convert the known mass of the reactant or product t ...
Naming Binary Molecular Compounds
... Is the substance elemental? No, three elements are present. Is the substance ionic? Yes, metal + non-metal. Are there any monoatomic ions? Yes, barium ion is monoatomic. Barium ion = Ba2+ Oxidation # for Ba = +2 Which elements have specific rules? Oxygen has a rule....-2 in most compounds Oxidation ...
... Is the substance elemental? No, three elements are present. Is the substance ionic? Yes, metal + non-metal. Are there any monoatomic ions? Yes, barium ion is monoatomic. Barium ion = Ba2+ Oxidation # for Ba = +2 Which elements have specific rules? Oxygen has a rule....-2 in most compounds Oxidation ...
9/10/10 1 Chemistry 121: Atomic and Molecular Chemistry
... The Mole and Molar Mass: Chemists measure atoms and molecules in moles. • In the SI system the mole (mol) is the amount of a substance that contains as many elementary entities (atoms, molecules, or other particles) as there are atoms in exactly 12 g (or 0.012 kg) of the carbon-12 isotope. The actu ...
... The Mole and Molar Mass: Chemists measure atoms and molecules in moles. • In the SI system the mole (mol) is the amount of a substance that contains as many elementary entities (atoms, molecules, or other particles) as there are atoms in exactly 12 g (or 0.012 kg) of the carbon-12 isotope. The actu ...
Example - Request a Spot account
... 1. Identify all reactants & products in the reaction & write out their formulas (this is the unbalanced chemical equation) 2. Count the number of each atom for each compound for each reactant & product (these values must be the same for both reactants & products when the reaction is balanced!) ...
... 1. Identify all reactants & products in the reaction & write out their formulas (this is the unbalanced chemical equation) 2. Count the number of each atom for each compound for each reactant & product (these values must be the same for both reactants & products when the reaction is balanced!) ...
Glossary: Chemical bonds
... system evolves heat and decreases its internal energy, H <0). The increase in pressure causes shifting of the equilibrium towards less quantity of gaseous substances (as pressure is affected only by gaseous substances), and decrease in pressure shifts the equilibrium towards more quantity of gaseou ...
... system evolves heat and decreases its internal energy, H <0). The increase in pressure causes shifting of the equilibrium towards less quantity of gaseous substances (as pressure is affected only by gaseous substances), and decrease in pressure shifts the equilibrium towards more quantity of gaseou ...
System International Base Units
... Lewis structures for compounds Draw element with most unpaired electrons in center Draw other elements around center element (s) such that their unpaired electrons face each other, then connect the unpaired electrons All atoms should have eight electrons around them (remember dashes represent ...
... Lewis structures for compounds Draw element with most unpaired electrons in center Draw other elements around center element (s) such that their unpaired electrons face each other, then connect the unpaired electrons All atoms should have eight electrons around them (remember dashes represent ...
Click here to Ch 06.2 Covalent Bonding_Lewis Structures
... form so that each atom, by gaining, losing, or sharing electrons, has an octet of electrons in its highest energy level. ...
... form so that each atom, by gaining, losing, or sharing electrons, has an octet of electrons in its highest energy level. ...
remaster unit 8A + 7
... 1) Determine number of atoms for each element. 2) Pick an element that is not equal on both sides of the equation. 3) Add a coefficient in front of the formula with that element and adjust your counts. 4) Continue adding coefficients to get the same number of atoms of each element on each side. ...
... 1) Determine number of atoms for each element. 2) Pick an element that is not equal on both sides of the equation. 3) Add a coefficient in front of the formula with that element and adjust your counts. 4) Continue adding coefficients to get the same number of atoms of each element on each side. ...
H - JMap
... If you wish to change an answer, erase your first penciled circle and then circle with pencil the number of the answer you want. After you have completed the examination and you have decided that all of the circled answers represent your best judgment, signal a proctor and turn in all examination ma ...
... If you wish to change an answer, erase your first penciled circle and then circle with pencil the number of the answer you want. After you have completed the examination and you have decided that all of the circled answers represent your best judgment, signal a proctor and turn in all examination ma ...
chapter 1 - Louisiana Tech University
... (2) Matter is anything that has mass, occupies space, and can be seen by the naked eye. (3) The two most abundant elements in the earth’s crust are oxygen and carbon. a) All three statements are true. b) Two of the three statements are true. c) Only one of the statements is true. d) None of the stat ...
... (2) Matter is anything that has mass, occupies space, and can be seen by the naked eye. (3) The two most abundant elements in the earth’s crust are oxygen and carbon. a) All three statements are true. b) Two of the three statements are true. c) Only one of the statements is true. d) None of the stat ...
Types of Chemical Reactions
... Magnesium metal can be used to remove tarnish from silver items. Silver tarnish is the corrosion that occurs when silver metal reacts with substances in the environment, especially those containing sulfur. Why would magnesium remove tarnish from silver? ...
... Magnesium metal can be used to remove tarnish from silver items. Silver tarnish is the corrosion that occurs when silver metal reacts with substances in the environment, especially those containing sulfur. Why would magnesium remove tarnish from silver? ...
Chapter 2
... All isotopes heavier than bismuth-209 are radioactive, even though they may decay slowly and be stable enough to occur naturally. ...
... All isotopes heavier than bismuth-209 are radioactive, even though they may decay slowly and be stable enough to occur naturally. ...
chapter2.1
... • Isotopes are also represented by the notation: Name-A, where Name is the name of the element and A is the mass number of the isotope. • An example of this isotope notation is magnesium-26. This represents an isotope of magnesium that has a mass number of 26. ...
... • Isotopes are also represented by the notation: Name-A, where Name is the name of the element and A is the mass number of the isotope. • An example of this isotope notation is magnesium-26. This represents an isotope of magnesium that has a mass number of 26. ...
Chapter 4
... • Atoms are indivisible by chemical processes. – All atoms present at beginning are present at the end. – Atoms are not created or destroyed, just rearranged in chemical reactions. – Atoms of one element cannot change into atoms of another element. • Cannot turn lead into gold by a chemical reaction ...
... • Atoms are indivisible by chemical processes. – All atoms present at beginning are present at the end. – Atoms are not created or destroyed, just rearranged in chemical reactions. – Atoms of one element cannot change into atoms of another element. • Cannot turn lead into gold by a chemical reaction ...
Biology project Lz
... of carbon-containing compounds such as metal carbonates and carbonyls, simple oxides of carbon and cyanides, as well as the allotropes of carbon and simple carbon halides and sulfides, which are usually considered inorganic. The "C-H" definition excludes compounds that are historically and practical ...
... of carbon-containing compounds such as metal carbonates and carbonyls, simple oxides of carbon and cyanides, as well as the allotropes of carbon and simple carbon halides and sulfides, which are usually considered inorganic. The "C-H" definition excludes compounds that are historically and practical ...
Introduction to Stoichiometry
... What is Stoichiometry? The proportional relationship between two or more substances during a chemical reaction. In other words, using dimensional analysis to convert one substance to another There are many different types, but they are all similar. So, let’s start small. How small? ...
... What is Stoichiometry? The proportional relationship between two or more substances during a chemical reaction. In other words, using dimensional analysis to convert one substance to another There are many different types, but they are all similar. So, let’s start small. How small? ...
System International Base Units
... Lewis dot structure for period 2 elements Notice dots equal their number of valence electrons and do not pair up until after all four quadrants have at least one dot ...
... Lewis dot structure for period 2 elements Notice dots equal their number of valence electrons and do not pair up until after all four quadrants have at least one dot ...
formation of chemical bonds. -
... form Calcium oxide molecule. Ca+2 + O-2 CaO This is an example for ionic bond. In this bond, two electrons transfers from calcium atom to oxygen atom. 6. A, B, and C are three elements with atomic number 6, 11 and 17 respectively. i. Which of these cannot form ionic bond? Why? ii. Which of these c ...
... form Calcium oxide molecule. Ca+2 + O-2 CaO This is an example for ionic bond. In this bond, two electrons transfers from calcium atom to oxygen atom. 6. A, B, and C are three elements with atomic number 6, 11 and 17 respectively. i. Which of these cannot form ionic bond? Why? ii. Which of these c ...
IGCSE SoW 2013
... Describe the reactions with oxygen in air of magnesium, carbon and sulphur, and the acidbase character of the oxides produced and link acid - base character of the oxides to the position of the element in the Periodic Table ...
... Describe the reactions with oxygen in air of magnesium, carbon and sulphur, and the acidbase character of the oxides produced and link acid - base character of the oxides to the position of the element in the Periodic Table ...
History of chemistry
The history of chemistry represents a time span from ancient history to the present. By 1000 BC, civilizations used technologies that would eventually form the basis to the various branches of chemistry. Examples include extracting metals from ores, making pottery and glazes, fermenting beer and wine, extracting chemicals from plants for medicine and perfume, rendering fat into soap, making glass, and making alloys like bronze.The protoscience of chemistry, alchemy, was unsuccessful in explaining the nature of matter and its transformations. However, by performing experiments and recording the results, alchemists set the stage for modern chemistry. The distinction began to emerge when a clear differentiation was made between chemistry and alchemy by Robert Boyle in his work The Sceptical Chymist (1661). While both alchemy and chemistry are concerned with matter and its transformations, chemists are seen as applying scientific method to their work.Chemistry is considered to have become an established science with the work of Antoine Lavoisier, who developed a law of conservation of mass that demanded careful measurement and quantitative observations of chemical phenomena. The history of chemistry is intertwined with the history of thermodynamics, especially through the work of Willard Gibbs.