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CAPE CHEMISTRY UNIT TWO REVISION PAPER MODULE 1 (a
... (TOTAL 15) Production of carbon dioxide is favoured by low temperature (since its production is exothermic), high pressure (since less gaseous molecules are present after its formation) and a faster air flow so that more oxygen is available for complete combustion. 2. (a) (i) State three different s ...
... (TOTAL 15) Production of carbon dioxide is favoured by low temperature (since its production is exothermic), high pressure (since less gaseous molecules are present after its formation) and a faster air flow so that more oxygen is available for complete combustion. 2. (a) (i) State three different s ...
Chemistry Final Exam Review 2006-2007
... 7. What is the sign of an endothermic reaction and exothermic reaction? 8. Using the specific heat values for water and iron, which one would have the largest temperature change if they have the same mass? 9. Know how to calculate the heat released or absorbed during a physical change. a. Calculate ...
... 7. What is the sign of an endothermic reaction and exothermic reaction? 8. Using the specific heat values for water and iron, which one would have the largest temperature change if they have the same mass? 9. Know how to calculate the heat released or absorbed during a physical change. a. Calculate ...
Chemistry I Exams and Answer Keys 2015 Season
... test tube filled with dilute hydrochloric acid, the metal soon floats to the surface of the liquid. The density of magnesium is 1.79 g·cm–3, and the density of the HCl solution is 1.048 g·cm–3. The best explanation for the metal floating on the liquid is that A. the metal is less dense than the acid ...
... test tube filled with dilute hydrochloric acid, the metal soon floats to the surface of the liquid. The density of magnesium is 1.79 g·cm–3, and the density of the HCl solution is 1.048 g·cm–3. The best explanation for the metal floating on the liquid is that A. the metal is less dense than the acid ...
CHEMISTRY ANSWERS TO Textbook Questions
... substances, such as carbon dioxide and ash, and the process cannot be reversed. (d) physical change (e) Chemical change. There are colour changes, texture changes, and smells emitted that all point toward a chemical change occurring. 5. The fact that the breaking of the glowstick causes the substanc ...
... substances, such as carbon dioxide and ash, and the process cannot be reversed. (d) physical change (e) Chemical change. There are colour changes, texture changes, and smells emitted that all point toward a chemical change occurring. 5. The fact that the breaking of the glowstick causes the substanc ...
CHEM1100 Practice Exam 2 You have 120 minutes to complete this
... salts of Ag+, Pb2+, and (Hg2)2+. 4. Most silver salts are insoluble. AgNO3 and Ag(C2H3O2) are common soluble salts of silver; virtually anything else is insoluble. 5. Most sulfate salts are soluble. Important exceptions to this rule include BaSO4, PbSO4, Ag2SO4 and SrSO4 . 6. Most hydroxide salts ar ...
... salts of Ag+, Pb2+, and (Hg2)2+. 4. Most silver salts are insoluble. AgNO3 and Ag(C2H3O2) are common soluble salts of silver; virtually anything else is insoluble. 5. Most sulfate salts are soluble. Important exceptions to this rule include BaSO4, PbSO4, Ag2SO4 and SrSO4 . 6. Most hydroxide salts ar ...
Chemistry Notes
... Catalysts are used to make very difficult reactions happen. They help very large molecules combine. If you look at the graph, you will notice that when the activation energy is lower, the products can combine easier. So the forward and reverse reactions are both speeded up. ...
... Catalysts are used to make very difficult reactions happen. They help very large molecules combine. If you look at the graph, you will notice that when the activation energy is lower, the products can combine easier. So the forward and reverse reactions are both speeded up. ...
Why Study Chemistry
... At the Particulate Level: “ Two atoms of carbon plus one diatomic molecule of oxygen yields two molecules of carbon monoxide “ Equation Coefficients: “ Gives the relative amount of each compound involved in the chemical equation “ Balanced Chemical Equations: “ The number of each kind of atom on the ...
... At the Particulate Level: “ Two atoms of carbon plus one diatomic molecule of oxygen yields two molecules of carbon monoxide “ Equation Coefficients: “ Gives the relative amount of each compound involved in the chemical equation “ Balanced Chemical Equations: “ The number of each kind of atom on the ...
METALS AND NON – METALS Concepts
... Metals: Iron, Zinc, Copper, Aluminium etc. Non – metals: Chlorine, Nitrogen, Hydrogen, Oxygen, Sulphur etc. Apart from metals and non-metals some elements show properties of both metals and non – metals, e.g. Silicon, Arsenic, Germanium .They are called metalloids Comparison of physical and chemical ...
... Metals: Iron, Zinc, Copper, Aluminium etc. Non – metals: Chlorine, Nitrogen, Hydrogen, Oxygen, Sulphur etc. Apart from metals and non-metals some elements show properties of both metals and non – metals, e.g. Silicon, Arsenic, Germanium .They are called metalloids Comparison of physical and chemical ...
CHE 101– Chapter 8 – Study Guide Terms: Products, reactants
... ii. Recognize common acids and bases f. Combustion reactions CxHyOz + O2 H2O (l) + CO2 (g) + Heat 4. Steps to Complete a Reaction – Be able to fill in the missing products or reactants for chemical reactions a. Identify the type of reaction b. Determine the reaction mechanism c. Determine if the r ...
... ii. Recognize common acids and bases f. Combustion reactions CxHyOz + O2 H2O (l) + CO2 (g) + Heat 4. Steps to Complete a Reaction – Be able to fill in the missing products or reactants for chemical reactions a. Identify the type of reaction b. Determine the reaction mechanism c. Determine if the r ...
Organic Compound Synthesis on the Primitive Earth
... organisms is the sunlight utilized by photosynthetic organisms. But before the evolution of photosynthesis other sources of free energy must have been used. It is of interest to consider the sources of such free energy as well as the origin of the appropriate chemical compounds containing excess fre ...
... organisms is the sunlight utilized by photosynthetic organisms. But before the evolution of photosynthesis other sources of free energy must have been used. It is of interest to consider the sources of such free energy as well as the origin of the appropriate chemical compounds containing excess fre ...
Chapter #2-Newest CPub
... • Cannizzaro analyzed many gaseous compounds and showed that their chemical formulas could be established with a consistent scheme that used Avogadro’s hypothesis but avoided any extra assumptions about molecular formulas. • Many gaseous elements (hydrogen, oxygen, nitrogen, fluorine, chlorine, etc. ...
... • Cannizzaro analyzed many gaseous compounds and showed that their chemical formulas could be established with a consistent scheme that used Avogadro’s hypothesis but avoided any extra assumptions about molecular formulas. • Many gaseous elements (hydrogen, oxygen, nitrogen, fluorine, chlorine, etc. ...
Chapter 5 - U of L Class Index
... case. Side reactions or the equilibrium can prevent reactions from going to completion. When chemists perform reactions, there are two things they want to know; a) what is the theoretical yield of the reaction and b) what is the actual yield of the reaction. • The theoretical yield is the calculated ...
... case. Side reactions or the equilibrium can prevent reactions from going to completion. When chemists perform reactions, there are two things they want to know; a) what is the theoretical yield of the reaction and b) what is the actual yield of the reaction. • The theoretical yield is the calculated ...
AP Chemistry Note Outline
... 6. Cancel out any extra water and OH7. Balance Charge with e8. Multiply reactions by factors such that the e- cancel Add both ½ reactions ...
... 6. Cancel out any extra water and OH7. Balance Charge with e8. Multiply reactions by factors such that the e- cancel Add both ½ reactions ...
Chemical reactions and equations
... 1) Write the formulas of the reactants using element symbols to the left of the yield sign (arrow) 2) Draw the arrow 3) Write the formulas of the products to the right. ...
... 1) Write the formulas of the reactants using element symbols to the left of the yield sign (arrow) 2) Draw the arrow 3) Write the formulas of the products to the right. ...
Reactions and Stoichiometry Practice Problems
... B) How many moles of MgO are produced when 0.20 mole of O2 reacts completely? ...
... B) How many moles of MgO are produced when 0.20 mole of O2 reacts completely? ...
SODIUM HYDROGEN CARBONATE
... value of the Solvay process. About 11 million tons of Na2CO3 are produced annually. In 1995 the total production of sodium carbonate ranked eleventh among industrial chemicals. Sodium carbonate is a fairly strong, non-volatile base which is used in the manufacture of glass (55%), paper (5%), soap, a ...
... value of the Solvay process. About 11 million tons of Na2CO3 are produced annually. In 1995 the total production of sodium carbonate ranked eleventh among industrial chemicals. Sodium carbonate is a fairly strong, non-volatile base which is used in the manufacture of glass (55%), paper (5%), soap, a ...
Unit 6 Chemical Equations and Reactions Balancing Equations
... Balance the following chemical equations using coefficients 1 1Al(OH)3(s) + 3HCl (aq) → 1AlCl3 (aq) + 3H2O (l) 2. 3Fe2O3 (s) + 1CO (g) → 2Fe3O4(s) + 1CO2 (g) 3. 4FeO (s) + 1O2 (g) → 2Fe2O3 (s) 4. 2C6H6 (l) + 15O2 (g) → 12CO2 (g) + 6H2O (g) 5. 3Ca(OH)2 (aq) + 2H3PO4 (aq) → 6H2O (l) + 1Ca3(PO4)2 (s) 6 ...
... Balance the following chemical equations using coefficients 1 1Al(OH)3(s) + 3HCl (aq) → 1AlCl3 (aq) + 3H2O (l) 2. 3Fe2O3 (s) + 1CO (g) → 2Fe3O4(s) + 1CO2 (g) 3. 4FeO (s) + 1O2 (g) → 2Fe2O3 (s) 4. 2C6H6 (l) + 15O2 (g) → 12CO2 (g) + 6H2O (g) 5. 3Ca(OH)2 (aq) + 2H3PO4 (aq) → 6H2O (l) + 1Ca3(PO4)2 (s) 6 ...
Water splitting
![](https://commons.wikimedia.org/wiki/Special:FilePath/Electrolysis_of_Water.png?width=300)
Water splitting is the general term for a chemical reaction in which water is separated into oxygen and hydrogen. Efficient and economical water splitting would be a key technology component of a hydrogen economy. Various techniques for water splitting have been issued in water splitting patents in the United States. In photosynthesis, water splitting donates electrons to power the electron transport chain in photosystem II.