Entropy (Part I)
... is less; therefore, the entropy has increased. D. expand to fill the container only if it is an exothermic process and the net result has a greater probability. ...
... is less; therefore, the entropy has increased. D. expand to fill the container only if it is an exothermic process and the net result has a greater probability. ...
S4 Standard Grade Revision Booklet
... c) heating with carbon? 4. Give (i) word equations and (ii) equations using the chemical formulae (not necessarily balanced) for the reactions between: a) potassium and oxygen b) lithium and water c) magnesium and dilute hydrochloric acid. 5. Calculate the percentage by mass of: a) Sodium in sodium ...
... c) heating with carbon? 4. Give (i) word equations and (ii) equations using the chemical formulae (not necessarily balanced) for the reactions between: a) potassium and oxygen b) lithium and water c) magnesium and dilute hydrochloric acid. 5. Calculate the percentage by mass of: a) Sodium in sodium ...
homework-11th-chem
... 102Calculate the enthalpy change for the process : CCl4 (g) C (g) + 4Cl (g) and calculate the bond enthalpy of C-Cl in CCl4 ( g) vap H0 (CCl4 ) = 30.5 KJ/mol, f H0 (CCl4 ) = -135.5 KJ/mol a H0 (C ) = 715 KJ/mol a H0 (Cl2 ) = 242 KJ/mol 103 (a) Give the relationship between Cp and Cv. (b)Write a not ...
... 102Calculate the enthalpy change for the process : CCl4 (g) C (g) + 4Cl (g) and calculate the bond enthalpy of C-Cl in CCl4 ( g) vap H0 (CCl4 ) = 30.5 KJ/mol, f H0 (CCl4 ) = -135.5 KJ/mol a H0 (C ) = 715 KJ/mol a H0 (Cl2 ) = 242 KJ/mol 103 (a) Give the relationship between Cp and Cv. (b)Write a not ...
Section 4.8: Acid-Base Reactions
... ex. What volume of 12 M hydrochloric acid must be used to prepare 600. mL of a 0.30 M HCl solution? Describe the steps and equipment necessary to make this solution. ...
... ex. What volume of 12 M hydrochloric acid must be used to prepare 600. mL of a 0.30 M HCl solution? Describe the steps and equipment necessary to make this solution. ...
Major 1 Term 101 - KFUPM Faculty List
... From C8H18, 8 CO2 and 9 H2O can be formed. That however needs 16 + 9 =25 O atoms and thus 25/2 O2 molecules on the left. Since a correctly balanced equation contains the smallest possible set of integer coefficients, it must be multiplied by 2: 2 C8H18(l) + 25 O2(g) 16 CO2(g) + 18 H2O(l) ...
... From C8H18, 8 CO2 and 9 H2O can be formed. That however needs 16 + 9 =25 O atoms and thus 25/2 O2 molecules on the left. Since a correctly balanced equation contains the smallest possible set of integer coefficients, it must be multiplied by 2: 2 C8H18(l) + 25 O2(g) 16 CO2(g) + 18 H2O(l) ...
quiz questions chapters 1
... Which of the following is true about the scientific method? A) A hypothesis is a set of observations that are explained by an experiment. B) Researchers design experiments to prove the conclusions they have already reached. C) The purpose of performing an experiment is to confirm or contradict a hyp ...
... Which of the following is true about the scientific method? A) A hypothesis is a set of observations that are explained by an experiment. B) Researchers design experiments to prove the conclusions they have already reached. C) The purpose of performing an experiment is to confirm or contradict a hyp ...
O usually has oxidation number of -2, except in peroxides where it is
... The sum of the oxidation numbers of the elements in a polyatomic ion must equal the ion charge. Consider these examples. If there are two poly atomic ions in a compound deal with them first. ...
... The sum of the oxidation numbers of the elements in a polyatomic ion must equal the ion charge. Consider these examples. If there are two poly atomic ions in a compound deal with them first. ...
Worksheet to accompany demos on exchange reactions
... charge, but I wanted to get the simple idea across first and clarify later]. 2) The idea behind oxidation numbers. In the two examples given above, we were dealing with monatomic ions, which have an actual charge, and so it was relatively straightforward to tell if the charge changed upon chemical r ...
... charge, but I wanted to get the simple idea across first and clarify later]. 2) The idea behind oxidation numbers. In the two examples given above, we were dealing with monatomic ions, which have an actual charge, and so it was relatively straightforward to tell if the charge changed upon chemical r ...
Unit 6 Study Guide - Dorman High School
... C(g) + D(g). You have the gases A, B, C, and D at equilibrium. Upon adding gas A, the value of K A) increases because when A is added, more products are made, increasing the product-to-reactant ratio B) decreases because A is a reactant, so the product-toreactant ratio decreases C) does not change b ...
... C(g) + D(g). You have the gases A, B, C, and D at equilibrium. Upon adding gas A, the value of K A) increases because when A is added, more products are made, increasing the product-to-reactant ratio B) decreases because A is a reactant, so the product-toreactant ratio decreases C) does not change b ...
Unit 1 Student Booklet
... more of that element. That is, omit "mono" if only one of that element is in the compound. e.g. NO is nitrogen monoxide, but N2O is dinitrogen monoxide. 2. Name the second element and end in "-ide". Use prefixes to indicate the number of that element (including mono). 3. Write the name of the compou ...
... more of that element. That is, omit "mono" if only one of that element is in the compound. e.g. NO is nitrogen monoxide, but N2O is dinitrogen monoxide. 2. Name the second element and end in "-ide". Use prefixes to indicate the number of that element (including mono). 3. Write the name of the compou ...
Test 2 Guide Key
... 3) Less than 30 grams of acetylene, C2H2 (26.0g/mol)+ H2 can be produced from 64 grams of methane (16.0g/mol). First, need a balanced equation: 2CH4 C2H2 + 3H2 . #g C2H2 =64g CH4 (1mol CH4/16g CH4)(1mol C2H2/2mol CH4)(26g C2H2/mol C2H2) = 52 g so False. 4) In the reaction: CO + O2 CO2 , 10 moles ...
... 3) Less than 30 grams of acetylene, C2H2 (26.0g/mol)+ H2 can be produced from 64 grams of methane (16.0g/mol). First, need a balanced equation: 2CH4 C2H2 + 3H2 . #g C2H2 =64g CH4 (1mol CH4/16g CH4)(1mol C2H2/2mol CH4)(26g C2H2/mol C2H2) = 52 g so False. 4) In the reaction: CO + O2 CO2 , 10 moles ...
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.