General Chemistry Unit 11
... Chemical reactions in which energy is absorbed are endothermic. Energy is required for the reaction to occur. The energy absorbed is often heat energy or electrical energy. Adding electrical energy to metal oxides can separate them into the pure metal and oxygen. Adding electrical energy to sodium c ...
... Chemical reactions in which energy is absorbed are endothermic. Energy is required for the reaction to occur. The energy absorbed is often heat energy or electrical energy. Adding electrical energy to metal oxides can separate them into the pure metal and oxygen. Adding electrical energy to sodium c ...
Review for Physical Science Test #2
... 1. Compounds are made of ______________________ of elements that are _______________________________ together. 2. What are two ways that atoms can be bonded together? (Hint: both have to do with electrons.) ...
... 1. Compounds are made of ______________________ of elements that are _______________________________ together. 2. What are two ways that atoms can be bonded together? (Hint: both have to do with electrons.) ...
Electric Potential Energy
... It “feels” a force (as given by Coulomb’s law). It gains kinetic energy and loses potential energy if released. The Coulomb force does positive work, and mechanical energy is conserved. ...
... It “feels” a force (as given by Coulomb’s law). It gains kinetic energy and loses potential energy if released. The Coulomb force does positive work, and mechanical energy is conserved. ...
Utah - Wavefunction, Inc.
... matter how they are rearranged; the total mass stays the same. Although energy can be absorbed or released in a chemical reaction, the total amount of energy and matter in it remains constant. Many reactions attain a state of equilibrium. Many ordinary activities, such as baking, involve chemical re ...
... matter how they are rearranged; the total mass stays the same. Although energy can be absorbed or released in a chemical reaction, the total amount of energy and matter in it remains constant. Many reactions attain a state of equilibrium. Many ordinary activities, such as baking, involve chemical re ...
AT 25 °C - University of Bath
... Hence, at 450 °C, 108.24 kJ is evolved for each mole of the equation i.e 108.24 kJ is evolved per mole of nitrogen which reacts. Since, for a gas, volume ∝ number of moles, the 1:3 mixture is in the stoichiometric amount. At 0 °C and 1 atm pressure, 1 mole occupies 22.4 dm3. Thus, the total amount o ...
... Hence, at 450 °C, 108.24 kJ is evolved for each mole of the equation i.e 108.24 kJ is evolved per mole of nitrogen which reacts. Since, for a gas, volume ∝ number of moles, the 1:3 mixture is in the stoichiometric amount. At 0 °C and 1 atm pressure, 1 mole occupies 22.4 dm3. Thus, the total amount o ...
Which notation represents an atom of sodium
... a) The equation represents a physical change, with the product and reactants having different chemical properties. b) The equation represents a physical change, with the product and reactants having identical chemical properties. c) The equation represents a chemical change, with the product and rea ...
... a) The equation represents a physical change, with the product and reactants having different chemical properties. b) The equation represents a physical change, with the product and reactants having identical chemical properties. c) The equation represents a chemical change, with the product and rea ...
Full answers
... Explain why a drip for intravenous administration of fluids is made of a solution of NaCl at a particular concentration rather than pure water. Blood plasma is isotonic with cells (same osmotic pressure). Using saline drip of same osmotic pressure as blood prevents haemolysis or crenation of red blo ...
... Explain why a drip for intravenous administration of fluids is made of a solution of NaCl at a particular concentration rather than pure water. Blood plasma is isotonic with cells (same osmotic pressure). Using saline drip of same osmotic pressure as blood prevents haemolysis or crenation of red blo ...
Study Modules XII Chemistry 2017
... Two Ag+ ions will be replaced by one Ca2+ ions to maintain electrical neutrality. Thus a hole is created at the lattice site for every Ca2+ ion introduced. 7. The electrical conductivity of a metal decreases with rise in temperature while that of a semiconductor increases.Explain. In metals with inc ...
... Two Ag+ ions will be replaced by one Ca2+ ions to maintain electrical neutrality. Thus a hole is created at the lattice site for every Ca2+ ion introduced. 7. The electrical conductivity of a metal decreases with rise in temperature while that of a semiconductor increases.Explain. In metals with inc ...
physical and chemical change
... A physical property is a property of a substance that can be observed without changing the substance into another substance. For example, the melting point of a solid is a physical property. Color, hardness, shape and texture are other physical properties. A chemical property is a property of a subs ...
... A physical property is a property of a substance that can be observed without changing the substance into another substance. For example, the melting point of a solid is a physical property. Color, hardness, shape and texture are other physical properties. A chemical property is a property of a subs ...
ch6 - ChemistryVCE
... In a metallic lattice, the positive ions are surrounded by delocalised electrons; in an ionic lattice, negative ions alternate with the positive ions. Agree. In a metallic lattice, each positive ion attracts the delocalised electrons in its region, and each delocalised electron is attracted to all n ...
... In a metallic lattice, the positive ions are surrounded by delocalised electrons; in an ionic lattice, negative ions alternate with the positive ions. Agree. In a metallic lattice, each positive ion attracts the delocalised electrons in its region, and each delocalised electron is attracted to all n ...
Exam 2-f06 - Clayton State University
... 8.) The equilibrium constant, Kc for the following gas phase reaction is 0.50 at 600°C. A mixture of HCHO, H and CO is introduced into a flask at 600°C. After a short time, analysis of a small amount of the reaction mixture shows the concentration to be [HCHO] = 1.5M, [H2] = 1.2 M and [CO] = 1.0M. W ...
... 8.) The equilibrium constant, Kc for the following gas phase reaction is 0.50 at 600°C. A mixture of HCHO, H and CO is introduced into a flask at 600°C. After a short time, analysis of a small amount of the reaction mixture shows the concentration to be [HCHO] = 1.5M, [H2] = 1.2 M and [CO] = 1.0M. W ...
Chapter1 - WilsonChemWiki
... CH4 + 2 O2 CO2 + 2 H2O The underlined numbers are used to balance the number of atoms in both sides of the equation. Types of Reactions: (See Reference Table) 1) Synthesis reaction: two or more elements or simple compounds bond together to form product, example: N2 + 2O2 2NO2 2) Decomposition re ...
... CH4 + 2 O2 CO2 + 2 H2O The underlined numbers are used to balance the number of atoms in both sides of the equation. Types of Reactions: (See Reference Table) 1) Synthesis reaction: two or more elements or simple compounds bond together to form product, example: N2 + 2O2 2NO2 2) Decomposition re ...
Chemical changes
... (s) after the formula –solid Cu(s) (g) after the formula –gas H2 (g) (l) after the formula -liquid H2O(l) (aq) after the formula - dissolved in water, an aqueous solution. CaCl2 (aq) used after a product indicates a gas (same as (g)) O2 used after a product indicates a solid (same as (s)) ...
... (s) after the formula –solid Cu(s) (g) after the formula –gas H2 (g) (l) after the formula -liquid H2O(l) (aq) after the formula - dissolved in water, an aqueous solution. CaCl2 (aq) used after a product indicates a gas (same as (g)) O2 used after a product indicates a solid (same as (s)) ...
Name - Deans Community High School
... b) Is the forward reaction is exothermic or endothermic. ............................................ 1 c) Gold and platinum both catalyse the reaction. For the forward reaction EA using gold is 30 kJ, while EA using platinum is 40 kJ. i) using different dotted lines add this information to the grap ...
... b) Is the forward reaction is exothermic or endothermic. ............................................ 1 c) Gold and platinum both catalyse the reaction. For the forward reaction EA using gold is 30 kJ, while EA using platinum is 40 kJ. i) using different dotted lines add this information to the grap ...
Note : (i) All questions are compulsory. (ii) All
... woman’s body and is a pathway through which a baby comes out of the woman’s body during childbirth. 2. Uterus : Uterus is a muscular organ. Due to strong muscles and ability to expand and contract, the uterus can accomodate a growing foetus and push the baby during labour. 3. Overies : Ovaries are t ...
... woman’s body and is a pathway through which a baby comes out of the woman’s body during childbirth. 2. Uterus : Uterus is a muscular organ. Due to strong muscles and ability to expand and contract, the uterus can accomodate a growing foetus and push the baby during labour. 3. Overies : Ovaries are t ...
Revision Y12 Chemistry PLC
... (b) explanation of the solid structures of giant ionic lattices, resulting from oppositely charged ions strongly attracted in all directions e.g. NaCl (c) explanation of the effect of structure and bonding on the physical properties of ionic compounds, including melting and boiling points, solubilit ...
... (b) explanation of the solid structures of giant ionic lattices, resulting from oppositely charged ions strongly attracted in all directions e.g. NaCl (c) explanation of the effect of structure and bonding on the physical properties of ionic compounds, including melting and boiling points, solubilit ...
PRACTICE FINAL EXAM CHEMISTRY 152 This
... This practice final represents the format and general types of questions that you should expect to see on the final exam. Do not limit your studying to completing this final – you can also go back to old tests and “redo” them, redo Mastering Chemistry assignments for practice, study from old quizzes ...
... This practice final represents the format and general types of questions that you should expect to see on the final exam. Do not limit your studying to completing this final – you can also go back to old tests and “redo” them, redo Mastering Chemistry assignments for practice, study from old quizzes ...
Lecture 24 (Slides) October 18
... Ionic and Covalent Bonds • When Main Group elements react, electrons can be transferred (usually from a metal to a nonmetal) to form ionic bonds. In other cases, pairs of electrons can be shared (usually between nonmetal atoms) to form covalent bonds. In both cases valence electrons are somehow “re ...
... Ionic and Covalent Bonds • When Main Group elements react, electrons can be transferred (usually from a metal to a nonmetal) to form ionic bonds. In other cases, pairs of electrons can be shared (usually between nonmetal atoms) to form covalent bonds. In both cases valence electrons are somehow “re ...
Electrochemistry
Electrochemistry is the branch of physical chemistry that studies chemical reactions which take place at the interface of an electrode, usually a solid metal or a semiconductor, and an ionic conductor, the electrolyte. These reactions involve electric charges moving between the electrodes and the electrolyte (or ionic species in a solution). Thus electrochemistry deals with the interaction between electrical energy and chemical change.When a chemical reaction is caused by an externally supplied current, as in electrolysis, or if an electric current is produced by a spontaneous chemical reaction as in a battery, it is called an electrochemical reaction. Chemical reactions where electrons are transferred directly between molecules and/or atoms are called oxidation-reduction or (redox) reactions. In general, electrochemistry describes the overall reactions when individual redox reactions are separate but connected by an external electric circuit and an intervening electrolyte.