GCE Chemistry Question Paper Unit 04 - Kinetics, Equilibria
... Use the data from Experiment 1 to calculate a value for the rate constant (k) at this temperature. Deduce the units of k. Calculation ......................................................................................................................... ...
... Use the data from Experiment 1 to calculate a value for the rate constant (k) at this temperature. Deduce the units of k. Calculation ......................................................................................................................... ...
BONUS: Which line in the above graph represents G for the reaction
... A sample of 25.0 mL of vinegar (acetic acid) is titrated with standard sodium hydroxide solution, which is 0.500 M. If 30.0 mL of the NaOH solution are required for exact neutralization (phenolphthalein as indicator), the vinegar is HAc + OH- Ac- + H2O (A) ...
... A sample of 25.0 mL of vinegar (acetic acid) is titrated with standard sodium hydroxide solution, which is 0.500 M. If 30.0 mL of the NaOH solution are required for exact neutralization (phenolphthalein as indicator), the vinegar is HAc + OH- Ac- + H2O (A) ...
Complete the following equations
... member of Group 5A elements) will not form pentachloride. (Nitrogen cannot form NCl5 because nitrogen atom is a second period element, which an outermost shell (n = 2) cannot accommodate more than 8 electrons. P, As, and Sb have the outermost-shell with n > 2; each can form 5 covalent bonds and form ...
... member of Group 5A elements) will not form pentachloride. (Nitrogen cannot form NCl5 because nitrogen atom is a second period element, which an outermost shell (n = 2) cannot accommodate more than 8 electrons. P, As, and Sb have the outermost-shell with n > 2; each can form 5 covalent bonds and form ...
WELCOME TO AP CHEMISTRY
... some of the material you learned last year so that these topics will be more familiar to you as we go through the year. You may work alone or with a partner. If you do not know how to do a problem, ask a friend to explain it to you. You will be doing him/her a favor because the ability to explain a ...
... some of the material you learned last year so that these topics will be more familiar to you as we go through the year. You may work alone or with a partner. If you do not know how to do a problem, ask a friend to explain it to you. You will be doing him/her a favor because the ability to explain a ...
11 BALANCING CHEMICAL EQUATIONS 1. 2 K + 1
... only when atoms are joined or rearranged? Y N 2. In the above equation, the the rt. side are reactants? Y N 3. Æ means “to produce”, “to make”, or “to yield”? Y N 4.Skeleton equations are not Balanced? Y N 5. Hydrogen can be written as ...
... only when atoms are joined or rearranged? Y N 2. In the above equation, the the rt. side are reactants? Y N 3. Æ means “to produce”, “to make”, or “to yield”? Y N 4.Skeleton equations are not Balanced? Y N 5. Hydrogen can be written as ...
Chem 171 Review Exam 2
... major areas we have discussed. You are responsible for all material covered in lecture and in the text. Chapter 4: Chemical Reactions The Nature of Solutions: • speciation and stoichiometry associated with the dissolution of ionic vs. molecular compounds in water • strong vs. weak vs. nonelectrolyte ...
... major areas we have discussed. You are responsible for all material covered in lecture and in the text. Chapter 4: Chemical Reactions The Nature of Solutions: • speciation and stoichiometry associated with the dissolution of ionic vs. molecular compounds in water • strong vs. weak vs. nonelectrolyte ...
Types of Chemical Reactions
... (20 pts) Part 31-11 You will need to answer the questions by predicting products of the double replacement reaction. (20 pts) Part 4Using solubility tables and charts ...
... (20 pts) Part 31-11 You will need to answer the questions by predicting products of the double replacement reaction. (20 pts) Part 4Using solubility tables and charts ...
Basic chemistry - Ross University
... increase in pressure. Under these conditions, Keq will be more on the side of the educts, rather than the products. By artificially increasing the pressure further we can shift the equilibrium even more to the educts, by applying a vacuum on the other hand we can shift it to the products. Many react ...
... increase in pressure. Under these conditions, Keq will be more on the side of the educts, rather than the products. By artificially increasing the pressure further we can shift the equilibrium even more to the educts, by applying a vacuum on the other hand we can shift it to the products. Many react ...
3 - Study Hungary
... The dissolution of an ionic solid in water is endothermic. You have a saturated solution, which of the following changes will cause more solid to dissolve? A: Increase the temperature. B: Increase the pressure. C: Decrease the temperature. D: Decrease the pressure. E: Add more solid. ...
... The dissolution of an ionic solid in water is endothermic. You have a saturated solution, which of the following changes will cause more solid to dissolve? A: Increase the temperature. B: Increase the pressure. C: Decrease the temperature. D: Decrease the pressure. E: Add more solid. ...
Atoms, Molecules and Ions
... hydroxide ions (OH-) when dissolved in water. As an ionic compound, it follows the same nomenclature, the anion is always hydroxide ...
... hydroxide ions (OH-) when dissolved in water. As an ionic compound, it follows the same nomenclature, the anion is always hydroxide ...
Paper - Revision Science
... 7 Which of the following statements about fuel cells is not true? A Reactants must constantly be fed into the cell when it is in use. B Fuel cells are 100% efficient. C Fuel cells convert chemical energy directly into electrical energy. D Fuel cells produce electricity more efficiently than a diese ...
... 7 Which of the following statements about fuel cells is not true? A Reactants must constantly be fed into the cell when it is in use. B Fuel cells are 100% efficient. C Fuel cells convert chemical energy directly into electrical energy. D Fuel cells produce electricity more efficiently than a diese ...
The Elements of Group 15 (5A, V, VA) The Nitrogen Group
... Phosphine (PH3) is a highly toxic, volatile gas. Its melting and boiling points are lower than for NH3 due to lack of H-bonding. ...
... Phosphine (PH3) is a highly toxic, volatile gas. Its melting and boiling points are lower than for NH3 due to lack of H-bonding. ...
+ H 2 O(l )
... 2 K (aq) CrO4 (aq) Ba (aq) 2 NO3 (aq) 1. Ions form a compound; zero net charge. Thus the product must contain anions and cations. 2. Most ionic materials contain only two types of ions: one type of cation and one type of anion. possibilities….K2CrO4 KNO3 BaCrO4 Ba(NO3)2 ...
... 2 K (aq) CrO4 (aq) Ba (aq) 2 NO3 (aq) 1. Ions form a compound; zero net charge. Thus the product must contain anions and cations. 2. Most ionic materials contain only two types of ions: one type of cation and one type of anion. possibilities….K2CrO4 KNO3 BaCrO4 Ba(NO3)2 ...
Topic 20 Organic Chemistry
... Identify the feature which both molecules possess that accounts for this property. When 2-hydroxypropanoic acid is formed from 2-chloropropanoic acid, the product shows no optical activity. Deduce the type of nucleophilic substitution that takes place and explain your answer. ...
... Identify the feature which both molecules possess that accounts for this property. When 2-hydroxypropanoic acid is formed from 2-chloropropanoic acid, the product shows no optical activity. Deduce the type of nucleophilic substitution that takes place and explain your answer. ...
Chapter 4: Aqueous Solutions (Chs 4 and 5 in Jespersen, Ch4 in
... Important exceptions are acids and compounds such as ammonia that react with water to form ions. ...
... Important exceptions are acids and compounds such as ammonia that react with water to form ions. ...
8.4 Weak Acids and Bases, Continued
... Bases • Arrhenius described bases as compounds that dissociate to form a metal ion and a hydroxide ion (OH-) when dissolved in water. Arrhenius bases are formed from Group 1A and 2A metals. Hydroxide bases are characterized by a bitter taste and a slippery feel. • The Brønsted–Lowry definition of a ...
... Bases • Arrhenius described bases as compounds that dissociate to form a metal ion and a hydroxide ion (OH-) when dissolved in water. Arrhenius bases are formed from Group 1A and 2A metals. Hydroxide bases are characterized by a bitter taste and a slippery feel. • The Brønsted–Lowry definition of a ...
Equilibrium Notes - Chemistry Teaching Resources
... Often in Chemistry, particularly when doing calculations, it is convenient to assume that reactions go to completion. This means that the reactants ultimately form the products and no reactants (unless some are present in excess) are left. Many reactions, however, never go to completion but are in a ...
... Often in Chemistry, particularly when doing calculations, it is convenient to assume that reactions go to completion. This means that the reactants ultimately form the products and no reactants (unless some are present in excess) are left. Many reactions, however, never go to completion but are in a ...
Unit 1: Basic Chemistry for Biology QUIZ STUDY GUIDE Things to
... -Be able to recognize whether an equation is balanced or not. -Be able to balance an equation that is unbalanced. ...
... -Be able to recognize whether an equation is balanced or not. -Be able to balance an equation that is unbalanced. ...
In chemistry, a salt is an ionic compound that
... weak acids or weak bases ("weak salts") may smell after the conjugate acid (e.g., acetates like acetic acid (vinegar) and cyanides like hydrogen cyanide (almonds)) or the conjugate base (e.g., ammonium salts like ammonia) of the component ions. That slow, partial decomposition is usually accelerated ...
... weak acids or weak bases ("weak salts") may smell after the conjugate acid (e.g., acetates like acetic acid (vinegar) and cyanides like hydrogen cyanide (almonds)) or the conjugate base (e.g., ammonium salts like ammonia) of the component ions. That slow, partial decomposition is usually accelerated ...
Acid
An acid (from the Latin acidus/acēre meaning sour) is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals (like calcium) to form salts. Aqueous solutions of acids have a pH of less than 7. Non-aqueous acids are usually formed when an anion (negative ion) reacts with one or more positively charged hydrogen cations. A lower pH means a higher acidity, and thus a higher concentration of positive hydrogen ions in the solution. Chemicals or substances having the property of an acid are said to be acidic.There are three common definitions for acids: the Arrhenius definition, the Brønsted-Lowry definition, and the Lewis definition. The Arrhenius definition defines acids as substances which increase the concentration of hydrogen ions (H+), or more accurately, hydronium ions (H3O+), when dissolved in water. The Brønsted-Lowry definition is an expansion: an acid is a substance which can act as a proton donor. By this definition, any compound which can easily be deprotonated can be considered an acid. Examples include alcohols and amines which contain O-H or N-H fragments. A Lewis acid is a substance that can accept a pair of electrons to form a covalent bond. Examples of Lewis acids include all metal cations, and electron-deficient molecules such as boron trifluoride and aluminium trichloride.Common examples of acids include hydrochloric acid (a solution of hydrogen chloride which is found in gastric acid in the stomach and activates digestive enzymes), acetic acid (vinegar is a dilute solution of this liquid), sulfuric acid (used in car batteries), and tartaric acid (a solid used in baking). As these examples show, acids can be solutions or pure substances, and can be derived from solids, liquids, or gases. Strong acids and some concentrated weak acids are corrosive, but there are exceptions such as carboranes and boric acid.