CHEMISTRY Periodic Table of the Elements
... Is made of protons, electrons and neutrons together An element located near the “staircase” of the periodic table with some metallic and some non-metallic properties An element that is generally a non-conductor of electricity and is brittle An element that is a good conductor of electricity, malleab ...
... Is made of protons, electrons and neutrons together An element located near the “staircase” of the periodic table with some metallic and some non-metallic properties An element that is generally a non-conductor of electricity and is brittle An element that is a good conductor of electricity, malleab ...
Chapter 2 - My Teacher Site
... Ions participating in an ionic bond with each other need not have acquired their charge by electron transfer with each other ...
... Ions participating in an ionic bond with each other need not have acquired their charge by electron transfer with each other ...
Stoichiometry - Norbraten
... 1. Sodium sulfate reacts with carbon to form sodium sulfide and carbon dioxide. How many moles of carbon are needed to completely react with 5.15 moles of sodium sulfate? 2. Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide. How many moles of nitric acid are produced when ...
... 1. Sodium sulfate reacts with carbon to form sodium sulfide and carbon dioxide. How many moles of carbon are needed to completely react with 5.15 moles of sodium sulfate? 2. Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide. How many moles of nitric acid are produced when ...
C6-Chemical Reactions
... change is called a chemical property. Chemical properties can be used to identify a substance. But chemical properties can be observed only when a substance undergoes a chemical change. Chemical Change- the composition or identity of the matter changes. A new substance or new substances are ...
... change is called a chemical property. Chemical properties can be used to identify a substance. But chemical properties can be observed only when a substance undergoes a chemical change. Chemical Change- the composition or identity of the matter changes. A new substance or new substances are ...
1. What is the best definition of rate of reaction? A. The time it takes
... Alex’s hypothesis was that the rate will be affected by changing the concentrations of the propanone and the iodine, as the reaction can happen without a catalyst. Hannah’s hypothesis was that as the catalyst is involved in the reaction, the concentrations of the propanone, iodine and the hydrogen i ...
... Alex’s hypothesis was that the rate will be affected by changing the concentrations of the propanone and the iodine, as the reaction can happen without a catalyst. Hannah’s hypothesis was that as the catalyst is involved in the reaction, the concentrations of the propanone, iodine and the hydrogen i ...
Thermochemistry
... ΔH = 5476 kJ., highly exothermic. Note the state of all reactants and products must be specified in a thermochemical expression, since changes in state require energy the energy absorbed or released will depend on the state of each reactant and product. Note : A ΔH value written beside an equation ...
... ΔH = 5476 kJ., highly exothermic. Note the state of all reactants and products must be specified in a thermochemical expression, since changes in state require energy the energy absorbed or released will depend on the state of each reactant and product. Note : A ΔH value written beside an equation ...
Chapter 4: Aqueous Reactions and Solution Stoichiometry
... Solutions are defined as homogeneous mixtures of two or more pure substances. The solvent is present in greatest abundance. All other substances are solutes. ...
... Solutions are defined as homogeneous mixtures of two or more pure substances. The solvent is present in greatest abundance. All other substances are solutes. ...
Chemical Equations and Reactions
... represented. It is often helpful to write a word equation, an equation in which the reactants and products in a chemical reaction are represented by words. A word equation has only qualitative (descriptive) meaning. It does not give the whole story because it does not give the quantities of reactant ...
... represented. It is often helpful to write a word equation, an equation in which the reactants and products in a chemical reaction are represented by words. A word equation has only qualitative (descriptive) meaning. It does not give the whole story because it does not give the quantities of reactant ...
1b-Redox FIB notes and practice
... On the other hand, copper is ______________ in this reaction from Cu 0 to Cu +2. These results agree with those obtained by analyzing the reaction by using electron transfer. Example: Use the change in oxidation number to identify which elements are oxidized and reduced in each of these reactions. ...
... On the other hand, copper is ______________ in this reaction from Cu 0 to Cu +2. These results agree with those obtained by analyzing the reaction by using electron transfer. Example: Use the change in oxidation number to identify which elements are oxidized and reduced in each of these reactions. ...
g - Valencia College
... Iron metal has a specific heat of 0.449 J/(g.oC). How much heat is transferred to a 5.00 g piece of iron, initially at 20.0oC when placed in a pot of boiling water? (Assume that the temperature of the water is 100.0oC and the water remains at this temperature, which is the final temperature of the i ...
... Iron metal has a specific heat of 0.449 J/(g.oC). How much heat is transferred to a 5.00 g piece of iron, initially at 20.0oC when placed in a pot of boiling water? (Assume that the temperature of the water is 100.0oC and the water remains at this temperature, which is the final temperature of the i ...
Step 2
... call it ____________ BONDING. This type of bonding normally occurs between _______ atoms. It causes the atoms in a molecule to be held together very strongly but there are ____ forces between individual molecules. This is why covalently-bonded molecules have low melting and boiling points (i.e. they ...
... call it ____________ BONDING. This type of bonding normally occurs between _______ atoms. It causes the atoms in a molecule to be held together very strongly but there are ____ forces between individual molecules. This is why covalently-bonded molecules have low melting and boiling points (i.e. they ...
Step 2 - The Grange School Blogs
... call it ____________ BONDING. This type of bonding normally occurs between _______ atoms. It causes the atoms in a molecule to be held together very strongly but there are ____ forces between individual molecules. This is why covalently-bonded molecules have low melting and boiling points (i.e. they ...
... call it ____________ BONDING. This type of bonding normally occurs between _______ atoms. It causes the atoms in a molecule to be held together very strongly but there are ____ forces between individual molecules. This is why covalently-bonded molecules have low melting and boiling points (i.e. they ...
Ch 17 Equilibrium Notes
... 3.List the initial concentrations. 4.Calculate Q and determine the shift to equilibrium. 5. Define equilibrium concentrations. 6.Substitute equilibrium concentrations into equilibrium expression and solve. 7.Check calculated concentrations by calculating K. 1) 2HI (g) ↔ H2 (g) + I2 (g) A 2.00 L flas ...
... 3.List the initial concentrations. 4.Calculate Q and determine the shift to equilibrium. 5. Define equilibrium concentrations. 6.Substitute equilibrium concentrations into equilibrium expression and solve. 7.Check calculated concentrations by calculating K. 1) 2HI (g) ↔ H2 (g) + I2 (g) A 2.00 L flas ...
HONG KONG DIPLOMA OF SECONDARY EDUCATION
... kilopascals (kPa) (compared to Earth’s 101.3 kPa). It is actually less than 1% the atmospheric density of Earth. Therefore, there is very little air pressure. It consists of 95% by volume of carbon dioxide, 3% by volume of nitrogen, 1.6% by volume of argon, and trace amounts of oxygen and water vapo ...
... kilopascals (kPa) (compared to Earth’s 101.3 kPa). It is actually less than 1% the atmospheric density of Earth. Therefore, there is very little air pressure. It consists of 95% by volume of carbon dioxide, 3% by volume of nitrogen, 1.6% by volume of argon, and trace amounts of oxygen and water vapo ...
Chemical reaction
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes may occur.The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants. Reactions often consist of a sequence of individual sub-steps, the so-called elementary reactions, and the information on the precise course of action is part of the reaction mechanism. Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions.Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration. Typically, reaction rates increase with increasing temperature because there is more thermal energy available to reach the activation energy necessary for breaking bonds between atoms.Reactions may proceed in the forward or reverse direction until they go to completion or reach equilibrium. Reactions that proceed in the forward direction to approach equilibrium are often described as spontaneous, requiring no input of free energy to go forward. Non-spontaneous reactions require input of free energy to go forward (examples include charging a battery by applying an external electrical power source, or photosynthesis driven by absorption of electromagnetic radiation in the form of sunlight).Different chemical reactions are used in combinations during chemical synthesis in order to obtain a desired product. In biochemistry, a consecutive series of chemical reactions (where the product of one reaction is the reactant of the next reaction) form metabolic pathways. These reactions are often catalyzed by protein enzymes. Enzymes increase the rates of biochemical reactions, so that metabolic syntheses and decompositions impossible under ordinary conditions can occur at the temperatures and concentrations present within a cell.The general concept of a chemical reaction has been extended to reactions between entities smaller than atoms, including nuclear reactions, radioactive decays, and reactions between elementary particles as described by quantum field theory.