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Year 9 Science revison _15-16_ end of year CHEM
... iv) The compound RbSO4 dissolves in water, but the element Rb doesn’t. Why ? The compound is made up of ions bonded together. When it dissolves in water, these ions separate from each other. They are charged (+ and -) and able to attract to and bond with water. This is why the ionic compound CAN dis ...
... iv) The compound RbSO4 dissolves in water, but the element Rb doesn’t. Why ? The compound is made up of ions bonded together. When it dissolves in water, these ions separate from each other. They are charged (+ and -) and able to attract to and bond with water. This is why the ionic compound CAN dis ...
Module 4 Trivia Review
... Semi means half or partial. So semiconductors (metalloids) have electrical conductivity half way between those of a conductor and an insulator (non-metal). Since they are solid and ductile, these metalloids have been found to be indispensable to the technology industry. Metals would conduct too much ...
... Semi means half or partial. So semiconductors (metalloids) have electrical conductivity half way between those of a conductor and an insulator (non-metal). Since they are solid and ductile, these metalloids have been found to be indispensable to the technology industry. Metals would conduct too much ...
Catalyst Notes - University of Idaho
... concentration cancels out in the calculation of the equilibrium constant a small amount of catalyst affects the rate of reaction for a large amount of reactant (because the catalyst is not consumed, it can participate many times over) are classified as homogeneous or heterogeneous (surface catalysts ...
... concentration cancels out in the calculation of the equilibrium constant a small amount of catalyst affects the rate of reaction for a large amount of reactant (because the catalyst is not consumed, it can participate many times over) are classified as homogeneous or heterogeneous (surface catalysts ...
CHAPTER 8 PERIODIC RELATIONSHIPS AMONG THE ELEMENTS
... (1s ) remain constant while the nuclear charge increases. The electrons that are added across the row are valence electrons which do not shield each other well. Therefore, moving across a period of the table, the valence electrons experience a greater effective nuclear charge. Of the elements in a g ...
... (1s ) remain constant while the nuclear charge increases. The electrons that are added across the row are valence electrons which do not shield each other well. Therefore, moving across a period of the table, the valence electrons experience a greater effective nuclear charge. Of the elements in a g ...
CHEM*130 (F 01) REVIEW QUESTIONS FOR MIDTERM I PAGE
... 2 Cu 2+(aq) + 4 I!(aq) ÷ 2 CuI(aq) + I2(s) I2(s) + 2 S2O32!(aq) ÷ S4O62!(aq) + 2 I!(aq) If 31.4 mL of 0.0500 M Na 2S2O3 solution was required for the titration, calculate the percent by mass of Cu in the mineral. ...
... 2 Cu 2+(aq) + 4 I!(aq) ÷ 2 CuI(aq) + I2(s) I2(s) + 2 S2O32!(aq) ÷ S4O62!(aq) + 2 I!(aq) If 31.4 mL of 0.0500 M Na 2S2O3 solution was required for the titration, calculate the percent by mass of Cu in the mineral. ...
Summary - Clydebank High School
... Section (d) - Bonding, structure and properties of the first 20 elements. 1. Metallic bonding is an electrostatic attraction between the ................................charged nucleus and the delocalised outer .................................................. 2. Atoms of non-metal elements bond to ...
... Section (d) - Bonding, structure and properties of the first 20 elements. 1. Metallic bonding is an electrostatic attraction between the ................................charged nucleus and the delocalised outer .................................................. 2. Atoms of non-metal elements bond to ...
The s-Block Elements - GCG-42
... BeCl2 is essentially covalent, with comparatively low m.pt. The lower members in group II form essentially ionic chlorides, with Mg having intermediate properties. ...
... BeCl2 is essentially covalent, with comparatively low m.pt. The lower members in group II form essentially ionic chlorides, with Mg having intermediate properties. ...
HS-PS1-2. Construct and revise an explanation for the outcome of a
... Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction. [Clarification Statement: Emphasis is on using mathematical ideas to communicate the proportional relationships between masses of atoms in the reactants and the products, a ...
... Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction. [Clarification Statement: Emphasis is on using mathematical ideas to communicate the proportional relationships between masses of atoms in the reactants and the products, a ...
CLASS X carbon and its compound
... liquid, (ii) is miscible in water in all proportions, (iii) has a boiling point of 78.2°C and freezing point of – 118°C and (iv) is a bad conductor of electricity. Ethanol reacts with sodium and potassium to form their respective ethoxides and hydrogen gas. Ethanol gets dehydrated to ethene when hea ...
... liquid, (ii) is miscible in water in all proportions, (iii) has a boiling point of 78.2°C and freezing point of – 118°C and (iv) is a bad conductor of electricity. Ethanol reacts with sodium and potassium to form their respective ethoxides and hydrogen gas. Ethanol gets dehydrated to ethene when hea ...
A Voyage through Equations
... decomposition (D), combustion(C), single displacement (SD) or double displacement (DD). ...
... decomposition (D), combustion(C), single displacement (SD) or double displacement (DD). ...
CHEMISTRY The Central Science 9th Edition
... by symbols, using the initial letter of the name in capital form, starting by the old known elements, so Carbon is represented by the letter C, but Calcium is represented by the symbol Ca and Cobalt by the symbol Co, ……, Nitrogen is represented by the symbol N and Nickel by the symbol Ni, etc…. In g ...
... by symbols, using the initial letter of the name in capital form, starting by the old known elements, so Carbon is represented by the letter C, but Calcium is represented by the symbol Ca and Cobalt by the symbol Co, ……, Nitrogen is represented by the symbol N and Nickel by the symbol Ni, etc…. In g ...
Balance this equation:
... The diagram shows iron oxide, Fe2O3, and carbon monoxide, CO reacting to form iron and carbon dioxide. Which of the following is the correct full balanced chemical equation for the reaction depicted? ...
... The diagram shows iron oxide, Fe2O3, and carbon monoxide, CO reacting to form iron and carbon dioxide. Which of the following is the correct full balanced chemical equation for the reaction depicted? ...
Chem Curr - New Haven Science
... Chemistry is a study of the fundamental structure of matter that serves as a basic understanding of science needed in today’s world. It is a study of matter, energy, atomic and molecular structure, composition, bonding, the periodic law, chemical equations, acid-base reactions, solutions, gas laws, ...
... Chemistry is a study of the fundamental structure of matter that serves as a basic understanding of science needed in today’s world. It is a study of matter, energy, atomic and molecular structure, composition, bonding, the periodic law, chemical equations, acid-base reactions, solutions, gas laws, ...
General Chemistry Stoichiometry Notes
... You will be working in groups of 3- be sure to exchange contact info and be sure to communicate if you will be absent. Jobs Rotate- Write you job at the top of each lab. 1. Leader- Keeps all on task and makes sure directions are followed. 2. Scientist- Follows directions and is in charge of making ...
... You will be working in groups of 3- be sure to exchange contact info and be sure to communicate if you will be absent. Jobs Rotate- Write you job at the top of each lab. 1. Leader- Keeps all on task and makes sure directions are followed. 2. Scientist- Follows directions and is in charge of making ...
1 • Introduction The Scientific Method (1 of 20) 1
... sodium metal + water → sodium hydroxide + hydrogen gas Na° + H 2 O → NaOH + H2 ...
... sodium metal + water → sodium hydroxide + hydrogen gas Na° + H 2 O → NaOH + H2 ...
Chapter 4: Reactions in Aqueous Solution
... 1) Water is a very common solvent due to its wide availability and low cost (most of our world is water). 2) Many reactions take place in aqueous solution. The term aqueous means dissolved in water. 3) Hydration of solids in Water A) Solid dissolves (falls apart) through interaction of ions with wat ...
... 1) Water is a very common solvent due to its wide availability and low cost (most of our world is water). 2) Many reactions take place in aqueous solution. The term aqueous means dissolved in water. 3) Hydration of solids in Water A) Solid dissolves (falls apart) through interaction of ions with wat ...
Chapter 1 The Periodic Table - Beck-Shop
... The Periodic Table Multiple Choice Items (1) The Periodic Table – Historical Development Question 1 Around 1800 a number of scientists observed that a pure compound always contains the same proportion of elements by mass. This was one of the observations used by Dalton when he formulated his atomic ...
... The Periodic Table Multiple Choice Items (1) The Periodic Table – Historical Development Question 1 Around 1800 a number of scientists observed that a pure compound always contains the same proportion of elements by mass. This was one of the observations used by Dalton when he formulated his atomic ...
`A` LEVEL H2 CHEMISTRY ORGANIC REACTIONS SUMMARY By
... (f) describe hydrogen bonding, using ammonia and water as examples of molecules containing -NH and -OH groups (g) explain the terms bond energy, bond length and bond polarity and use them to compare the reactivities of covalent bonds (h) describe intermolecular forces (van der Waals’ forces), based ...
... (f) describe hydrogen bonding, using ammonia and water as examples of molecules containing -NH and -OH groups (g) explain the terms bond energy, bond length and bond polarity and use them to compare the reactivities of covalent bonds (h) describe intermolecular forces (van der Waals’ forces), based ...
Notes on QA - Scarsdale Public Schools
... Qualitative analysis involves separating a mixture of cations based on their solubilities. In the traditional QA scheme, the Group 1 cations (not the periodic table group 1) are separated from a mixture of dozens of cations based on their insolubility as chloride salts. Hence the Group 1 cations con ...
... Qualitative analysis involves separating a mixture of cations based on their solubilities. In the traditional QA scheme, the Group 1 cations (not the periodic table group 1) are separated from a mixture of dozens of cations based on their insolubility as chloride salts. Hence the Group 1 cations con ...
ism ismismismismismrapidrevisionquestionsismismismismismism
... (i) Combination between nitrogen and hydrogen to form ammonia in the presence of iron catalyst in Haber’s process. Fe N2 + 3H2 2NH3 (ii) Zeolites catalyst ZSM-5 is used to convert alcohol to gasoline by dehydration. (iii) The enzyme zymase converts glucose into ethyl alcohol and carbon dioxide. Zyma ...
... (i) Combination between nitrogen and hydrogen to form ammonia in the presence of iron catalyst in Haber’s process. Fe N2 + 3H2 2NH3 (ii) Zeolites catalyst ZSM-5 is used to convert alcohol to gasoline by dehydration. (iii) The enzyme zymase converts glucose into ethyl alcohol and carbon dioxide. Zyma ...
Homework Booklet [4,S]
... Calculate the formula for magnesium oxide from Lucy’s results. Calculate the relative formula mass (RFM) of magnesium oxide with this formula. Calculate the % of magnesium in the magnesium oxide. Peter’s results do not give the correct answer for the formula. Suggest some possible experimental reaso ...
... Calculate the formula for magnesium oxide from Lucy’s results. Calculate the relative formula mass (RFM) of magnesium oxide with this formula. Calculate the % of magnesium in the magnesium oxide. Peter’s results do not give the correct answer for the formula. Suggest some possible experimental reaso ...
C:\My Documents\My Documents\Teaching\chem130\hunt
... 2 Cu2+(aq) + 4 I!(aq) ÷ 2 CuI(aq) + I2(s) I2(s) + 2 S2O32!(aq) ÷ S4O62!(aq) + 2 I!(aq) If 31.4 mL of 0.0500 M Na2S2O3 solution was required for the titration, calculate the percent by mass of Cu in the mineral. ...
... 2 Cu2+(aq) + 4 I!(aq) ÷ 2 CuI(aq) + I2(s) I2(s) + 2 S2O32!(aq) ÷ S4O62!(aq) + 2 I!(aq) If 31.4 mL of 0.0500 M Na2S2O3 solution was required for the titration, calculate the percent by mass of Cu in the mineral. ...
Kinetics and Equilibrium Review Page 1
... 21. Which of the following best describes exothermic chemical reactions? A) They never release heat. B) They always release heat. C) They never occur spontaneously. D) They always occur spontaneously. 22. For a given reaction, adding a catalyst increases the rate of the reaction by ...
... 21. Which of the following best describes exothermic chemical reactions? A) They never release heat. B) They always release heat. C) They never occur spontaneously. D) They always occur spontaneously. 22. For a given reaction, adding a catalyst increases the rate of the reaction by ...
Redox
![](https://commons.wikimedia.org/wiki/Special:FilePath/NaF.gif?width=300)
Redox reactions include all chemical reactions in which atoms have their oxidation state changed; in general, redox reactions involve the transfer of electrons between species. The term ""redox"" comes from two concepts involved with electron transfer: reduction and oxidation. It can be explained in simple terms: Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion. Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.Although oxidation reactions are commonly associated with the formation of oxides from oxygen molecules, these are only specific examples of a more general concept of reactions involving electron transfer.Redox reactions, or oxidation-reduction reactions, have a number of similarities to acid–base reactions. Like acid–base reactions, redox reactions are a matched set, that is, there cannot be an oxidation reaction without a reduction reaction happening simultaneously. The oxidation alone and the reduction alone are each called a half-reaction, because two half-reactions always occur together to form a whole reaction. When writing half-reactions, the gained or lost electrons are typically included explicitly in order that the half-reaction be balanced with respect to electric charge.Though sufficient for many purposes, these descriptions are not precisely correct. Oxidation and reduction properly refer to a change in oxidation state — the actual transfer of electrons may never occur. The oxidation state of an atom is the fictitious charge that an atom would have if all bonds between atoms of different elements were 100% ionic. Thus, oxidation is better defined as an increase in oxidation state, and reduction as a decrease in oxidation state. In practice, the transfer of electrons will always cause a change in oxidation state, but there are many reactions that are classed as ""redox"" even though no electron transfer occurs (such as those involving covalent bonds).There are simple redox processes, such as the oxidation of carbon to yield carbon dioxide (CO2) or the reduction of carbon by hydrogen to yield methane (CH4), and more complex processes such as the oxidation of glucose (C6H12O6) in the human body through a series of complex electron transfer processes.