Question paper - Edexcel
... hydrogencarbonate as shown in the equation below. C6H8O7(s) + 3NaHCO3(s) o Na3C6H5O7(s) + 3CO2(g) + 3H2O(l) Use the structural formula of citric acid to explain why one mole of citric acid neutralizes three moles of sodium hydrogencarbonate. ...
... hydrogencarbonate as shown in the equation below. C6H8O7(s) + 3NaHCO3(s) o Na3C6H5O7(s) + 3CO2(g) + 3H2O(l) Use the structural formula of citric acid to explain why one mole of citric acid neutralizes three moles of sodium hydrogencarbonate. ...
Name - cloudfront.net
... By what quantity must the heat capacity (J/oC) of an object be divided to obtain the specific heat (J/goC) of that material? 64. When energy is changed from one form to another, ____. 65. What happens to the energy produced by burning gasoline in a car engine? 66. How can the enthalpy change be dete ...
... By what quantity must the heat capacity (J/oC) of an object be divided to obtain the specific heat (J/goC) of that material? 64. When energy is changed from one form to another, ____. 65. What happens to the energy produced by burning gasoline in a car engine? 66. How can the enthalpy change be dete ...
Unit 6 Moles and Stoichiometry Short Answer Review
... Base your answers to questions 1 through 3 on the information below. Rust on an automobile door contains Fe 2O3(s). The balanced equation representing one of the reactions between iron in the door of the automobile and oxygen in the atmosphere is given below. 4Fe(s) + 3O 2(g) 2Fe 2O3(s) 1. Write the ...
... Base your answers to questions 1 through 3 on the information below. Rust on an automobile door contains Fe 2O3(s). The balanced equation representing one of the reactions between iron in the door of the automobile and oxygen in the atmosphere is given below. 4Fe(s) + 3O 2(g) 2Fe 2O3(s) 1. Write the ...
Spring 2001 Key
... c. If 3 moles of CO2 (g) and 4 moles of H2O (l) react to form propane gas and oxygen gas, 2220 kJ of heat will be consumed. d. The reactants must be provided with 4440 kJ of energy to produce 6 moles of carbon dioxide. e. This is an example of a reaction where the energy of chemical bonds is convert ...
... c. If 3 moles of CO2 (g) and 4 moles of H2O (l) react to form propane gas and oxygen gas, 2220 kJ of heat will be consumed. d. The reactants must be provided with 4440 kJ of energy to produce 6 moles of carbon dioxide. e. This is an example of a reaction where the energy of chemical bonds is convert ...
Chapter 2
... • A piece of aluminum foil 5.11 in x 3.23 in x 0.0381 in is dissolved in excess HCl(aq). How many grams of H2(g) are produced? • How many grams of each reactant are needed to produce 15 grams of iron form the following reaction? Fe2O3(s) + Al(s) Fe(s) + Al2O3(s) ...
... • A piece of aluminum foil 5.11 in x 3.23 in x 0.0381 in is dissolved in excess HCl(aq). How many grams of H2(g) are produced? • How many grams of each reactant are needed to produce 15 grams of iron form the following reaction? Fe2O3(s) + Al(s) Fe(s) + Al2O3(s) ...
Chapter 4 Stoichiometry Power Point
... In its compound, fluorine is always assigned an oxidation sate of -1. Oxygen is usually assigned an oxidation of -2 in its covalent compounds, such as CO, CO2, SO2. Exceptions to this rule includes peroxides (compounds containing the O22- group), where each oxygen is assigned an oxidation state of - ...
... In its compound, fluorine is always assigned an oxidation sate of -1. Oxygen is usually assigned an oxidation of -2 in its covalent compounds, such as CO, CO2, SO2. Exceptions to this rule includes peroxides (compounds containing the O22- group), where each oxygen is assigned an oxidation state of - ...
Fe(H2O)63+ + H2O → ← H3O+ + Fe(H2O)5(OH)2+
... 59. When Al2O3(s) is formed from the elements at standard conditions, the values of ∆H° and ∆G° at 298 K are –1617 kJ·mol–1 and –1577 kJ·mol–1, respectively. The standard entropy of formation per mole, in joules per degree, will be (A) (B) (C) (D) (E) ...
... 59. When Al2O3(s) is formed from the elements at standard conditions, the values of ∆H° and ∆G° at 298 K are –1617 kJ·mol–1 and –1577 kJ·mol–1, respectively. The standard entropy of formation per mole, in joules per degree, will be (A) (B) (C) (D) (E) ...
Exam 2
... However, under certain conditions, the combustion is incomplete and the following reaction also occurs. 2C(s) + O2(g) → 2CO(g) ...
... However, under certain conditions, the combustion is incomplete and the following reaction also occurs. 2C(s) + O2(g) → 2CO(g) ...
Redox - Plusnet
... track of how atoms have control over electrons Apply to ions and covalently bonded atoms The oxidation numbers of elements are zero e.g.. Fe(s), and even O2 ...
... track of how atoms have control over electrons Apply to ions and covalently bonded atoms The oxidation numbers of elements are zero e.g.. Fe(s), and even O2 ...
4.1 Writing and Balancing Chemical Equations
... reactions of this type involve the exchange of ions between ionic compounds in aqueous solution and are sometimes referred to as double displacement, double replacement, or metathesis reactions. These reactions are common in nature and are responsible for the formation of coral reefs in ocean waters ...
... reactions of this type involve the exchange of ions between ionic compounds in aqueous solution and are sometimes referred to as double displacement, double replacement, or metathesis reactions. These reactions are common in nature and are responsible for the formation of coral reefs in ocean waters ...
Lab Stuff:
... has the highest boiling point b. is the most viscous (define viscous, also) c. has the greatest intermolecular forces ...
... has the highest boiling point b. is the most viscous (define viscous, also) c. has the greatest intermolecular forces ...
Chemical Equations
... “yields”; indicates result of a reaction Indicates a reversible reaction A reactant or product in the solid state Alternative to (s); used only for a precipitate (solid) falling out of solution A reactant or product in the liquid state A reactant or product in aqueous solution (dissolved in water) A ...
... “yields”; indicates result of a reaction Indicates a reversible reaction A reactant or product in the solid state Alternative to (s); used only for a precipitate (solid) falling out of solution A reactant or product in the liquid state A reactant or product in aqueous solution (dissolved in water) A ...
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.