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Hein and Arena - faculty at Chemeketa
... pH = -log(3.0 x 10 ) = 2.52 Making no approximation and using the quadratic equation the answer is 2.99 x 10-3 mol/L, showing that it was justified to assume Y was small compared to 0.5. ...
... pH = -log(3.0 x 10 ) = 2.52 Making no approximation and using the quadratic equation the answer is 2.99 x 10-3 mol/L, showing that it was justified to assume Y was small compared to 0.5. ...
PowerPoint Lectures - Northwest ISD Moodle
... NaHCO3 (aq) + HBr (aq) NaBr (aq) + CO2 (g) + H2O (l) Antacids! ...
... NaHCO3 (aq) + HBr (aq) NaBr (aq) + CO2 (g) + H2O (l) Antacids! ...
Lesson 9 Review Teacher`s Copy
... 3.2.l. An electrolytic cell requires electrical energy to produce a chemical change. This process is known as electrolysis. (2) 3.2.i. Oxidation numbers (states) can be assigned to atoms and ions. Changes in oxidation numbers indicate that oxidation and reduction have occurred. (5) 3.2.j. An electro ...
... 3.2.l. An electrolytic cell requires electrical energy to produce a chemical change. This process is known as electrolysis. (2) 3.2.i. Oxidation numbers (states) can be assigned to atoms and ions. Changes in oxidation numbers indicate that oxidation and reduction have occurred. (5) 3.2.j. An electro ...
Camp 1 - Quynh Nguyen Official Website
... heat and work. Heat is the transfer of energy as a result of a difference in temperature. Work is done when an object is moved against an opposing force. Heat and work are equivalent ways of changing the energy of a system. Energy of an isolated system is conserved; it is neither created ...
... heat and work. Heat is the transfer of energy as a result of a difference in temperature. Work is done when an object is moved against an opposing force. Heat and work are equivalent ways of changing the energy of a system. Energy of an isolated system is conserved; it is neither created ...
Balancing Chemical Equations Guided Inquiry (CC)
... destroyed. In fact, matter can never be created or destroyed. This is one of the basic principles in chemistry known as the Law of Conservation of Mass. Matter cannot be created or destroyed, but we can change its form. In order for the equation to make sense, we need to balance the equation. This c ...
... destroyed. In fact, matter can never be created or destroyed. This is one of the basic principles in chemistry known as the Law of Conservation of Mass. Matter cannot be created or destroyed, but we can change its form. In order for the equation to make sense, we need to balance the equation. This c ...
Understanding the Role of Aqueous Solution in Chemical Reactions
... studies of two prototype aqueous chemical reactions. These reactions are not only of fundamental interest, but have also a significant importance in technological applications. In our study we employed molecular simulation of an accurate atomistic model, yielding a detailed picture of the structure ...
... studies of two prototype aqueous chemical reactions. These reactions are not only of fundamental interest, but have also a significant importance in technological applications. In our study we employed molecular simulation of an accurate atomistic model, yielding a detailed picture of the structure ...
Chem Review
... Zn + HCl ZnCl2 + H2 16. For the equation below, how many litres of carbon dioxide would be produced if 1.38g of propane gas were reacted with excess oxygen? ___C3H8 + ___O2 ___CO2 + ___H2O ...
... Zn + HCl ZnCl2 + H2 16. For the equation below, how many litres of carbon dioxide would be produced if 1.38g of propane gas were reacted with excess oxygen? ___C3H8 + ___O2 ___CO2 + ___H2O ...
Chem161 Chapter 6
... • If there will be no change in the moles of gas , we may use a coffee-cup calorimeter or a closed system. Under these circumstances, we measure qp. • If there is a large change in the moles of gas, we use a bomb calorimeter to measure qv. ...
... • If there will be no change in the moles of gas , we may use a coffee-cup calorimeter or a closed system. Under these circumstances, we measure qp. • If there is a large change in the moles of gas, we use a bomb calorimeter to measure qv. ...
FHN - Chemical and Physical Changes
... change, but the substances in the material stay the same. Change in state Solid melting to a liquid Liquid evaporating to a gas Gas condensing to a liquid Liquid freezing into a solid Usually occur with a change in temperature Can also be when a substance dissolves in a liquid, but doe ...
... change, but the substances in the material stay the same. Change in state Solid melting to a liquid Liquid evaporating to a gas Gas condensing to a liquid Liquid freezing into a solid Usually occur with a change in temperature Can also be when a substance dissolves in a liquid, but doe ...
stoichiometric relationships - Assets
... enough information to work out the number of moles of more than one reactant you must consider that one of these reactants will be the limiting reactant. The amount of product formed is determined by the amount of the limiting reactant.The other reactants (not the limiting reactant) are present in e ...
... enough information to work out the number of moles of more than one reactant you must consider that one of these reactants will be the limiting reactant. The amount of product formed is determined by the amount of the limiting reactant.The other reactants (not the limiting reactant) are present in e ...
Enzymes - stephen fleenor
... monosaccharide monomers? A carbohydrate is made from many monosaccharide monomers by… ...
... monosaccharide monomers? A carbohydrate is made from many monosaccharide monomers by… ...
Activity 14: Physical and Chemical Properties of Materials
... • A property is a quality or trait that characterizes a material or object. • Physical Properties can be determined without a chemical reaction. • Chemical Properties can only be determined by looking for a reaction. • Chemical Reaction is when a substance changes chemically into another substance. ...
... • A property is a quality or trait that characterizes a material or object. • Physical Properties can be determined without a chemical reaction. • Chemical Properties can only be determined by looking for a reaction. • Chemical Reaction is when a substance changes chemically into another substance. ...
Water: The Universal Solvent
... and the coefficients in the balanced chemical equation, write the expression for each of the following quantities (i) The number of moles of iron in the sample (ii) The mass of iron in the sample, in grams (iii) The mass percent of iron in the compound (e) What effect will adding too much titrant ha ...
... and the coefficients in the balanced chemical equation, write the expression for each of the following quantities (i) The number of moles of iron in the sample (ii) The mass of iron in the sample, in grams (iii) The mass percent of iron in the compound (e) What effect will adding too much titrant ha ...
Chemical Equations
... For example, in the equation describing the formation of liquid water from hydrogen gas and oxygen gas 2 H2(g) + O2(g) → 2 H2O(l) There are four hydrogen atoms on both the left and right sides of the equation There are two oxygen atoms on both the left and right sides of the equation Therefo ...
... For example, in the equation describing the formation of liquid water from hydrogen gas and oxygen gas 2 H2(g) + O2(g) → 2 H2O(l) There are four hydrogen atoms on both the left and right sides of the equation There are two oxygen atoms on both the left and right sides of the equation Therefo ...
What You Need to Know to Pass the Chemistry
... 14. Some elements may exist in two or more forms in the same phase. These forms differ in their molecular or crystal structure, hence their different properties. Ex: Carbon exists as both graphite and diamond (a network solid). Topic Seven: Moles and Stoichiometry 1. A compound is a substance comp ...
... 14. Some elements may exist in two or more forms in the same phase. These forms differ in their molecular or crystal structure, hence their different properties. Ex: Carbon exists as both graphite and diamond (a network solid). Topic Seven: Moles and Stoichiometry 1. A compound is a substance comp ...
Document
... The enthalpy of the reaction is the heat of a reaction A negative ∆H would cause a exothermic reaction A positive ∆H would cause a endothermic reaction The change in enthalpy in a reaction is equal to the magnitude, but for a opposite sign of the enthalpy the reaction is reversed. ...
... The enthalpy of the reaction is the heat of a reaction A negative ∆H would cause a exothermic reaction A positive ∆H would cause a endothermic reaction The change in enthalpy in a reaction is equal to the magnitude, but for a opposite sign of the enthalpy the reaction is reversed. ...
chapter15-burno.1348..
... equilibrium constant (KC or Kp) has a particular numerical value. This means that no matter what the starting concentrations or partial pressures for the system, at equilibrium the ratio of the concentrations (partial pressures) of the products divided by the concentrations (partial pressures) of th ...
... equilibrium constant (KC or Kp) has a particular numerical value. This means that no matter what the starting concentrations or partial pressures for the system, at equilibrium the ratio of the concentrations (partial pressures) of the products divided by the concentrations (partial pressures) of th ...
Electron configuration
... The Relation between cookies and chemistry: STOICHIOMETRY • Reaction equation tells us about what you need to react (reactant) to get a product. (like the cookies recipe) • STOICHIOMETRY is derived from Greek languages: stoicheion (element) and metron (measure) • Usage: STOICHIOMETRY is used to mea ...
... The Relation between cookies and chemistry: STOICHIOMETRY • Reaction equation tells us about what you need to react (reactant) to get a product. (like the cookies recipe) • STOICHIOMETRY is derived from Greek languages: stoicheion (element) and metron (measure) • Usage: STOICHIOMETRY is used to mea ...
Chemistry Standards and Frameworks
... mass of products and reactants. As a basis for understanding this concept: 3. a.: Students know how to describe chemical reactions by writing balanced equations. Reactions are described by balanced equations because all the atoms of the reactants must be accounted for in the reaction products. An eq ...
... mass of products and reactants. As a basis for understanding this concept: 3. a.: Students know how to describe chemical reactions by writing balanced equations. Reactions are described by balanced equations because all the atoms of the reactants must be accounted for in the reaction products. An eq ...
File
... ______1. Which of the following will increase the Ksp of PbCl2 ? A) Addition of HCl to the solution B) Addition of Pb(NO3)2 to the solution C) An increase in temperature D) All of these. ______2. AgCl would be LEAST soluble in a solution of 1.00 molar A) HNO3 B) AgNO3 C) HCl D) BaCl2 ______3. Methan ...
... ______1. Which of the following will increase the Ksp of PbCl2 ? A) Addition of HCl to the solution B) Addition of Pb(NO3)2 to the solution C) An increase in temperature D) All of these. ______2. AgCl would be LEAST soluble in a solution of 1.00 molar A) HNO3 B) AgNO3 C) HCl D) BaCl2 ______3. Methan ...
Stoichiometry
![](https://commons.wikimedia.org/wiki/Special:FilePath/Combustion_reaction_of_methane.jpg?width=300)
Stoichiometry /ˌstɔɪkiˈɒmɨtri/ is the calculation of relative quantities of reactants and products in chemical reactions.Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of product can be empirically determined, then the amount of the other reactants can also be calculated.As seen in the image to the right, where the balanced equation is:CH4 + 2 O2 → CO2 + 2 H2O.Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. Stoichiometry measures these quantitative relationships, and is used to determine the amount of products/reactants that are produced/needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry. In the example above, reaction stoichiometry measures the relationship between the methane and oxygen as they react to form carbon dioxide and water.Because of the well known relationship of moles to atomic weights, the ratios that are arrived at by stoichiometry can be used to determine quantities by weight in a reaction described by a balanced equation. This is called composition stoichiometry.Gas stoichiometry deals with reactions involving gases, where the gases are at a known temperature, pressure, and volume and can be assumed to be ideal gases. For gases, the volume ratio is ideally the same by the ideal gas law, but the mass ratio of a single reaction has to be calculated from the molecular masses of the reactants and products. In practice, due to the existence of isotopes, molar masses are used instead when calculating the mass ratio.