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W1 WORKSHOP ON STOICHIOMETRY
... When an ionic solid dissolves in water to form a solution, the charges on the ions are indicated. NaCl(s) → Na+(aq) + Cl–(aq) Again, the atoms must balance. Notice also that the electrical charges present on both sides of the equation must balance as well. In another example: BaCl2(s) → Ba2+(aq) + 2 ...
... When an ionic solid dissolves in water to form a solution, the charges on the ions are indicated. NaCl(s) → Na+(aq) + Cl–(aq) Again, the atoms must balance. Notice also that the electrical charges present on both sides of the equation must balance as well. In another example: BaCl2(s) → Ba2+(aq) + 2 ...
高雄醫學大學九十二學年度學士後醫學系招生考試試題 科目:化學 考試
... 63. Which of the following is not an oxidation-reduction reaction? (A) A precipitation reaction. (B) A reaction in which a metal reacts with a nonmetal. (C) A combustion reaction. (D) A metal reacting with an acid. (E) All of the above are oxidation-reduction reactions. 64. Aqueous solution of sodiu ...
... 63. Which of the following is not an oxidation-reduction reaction? (A) A precipitation reaction. (B) A reaction in which a metal reacts with a nonmetal. (C) A combustion reaction. (D) A metal reacting with an acid. (E) All of the above are oxidation-reduction reactions. 64. Aqueous solution of sodiu ...
IGCSE® Chemistry - Hodder Plus Home
... (c) the average mass of the isotopes of an element [1] compared with one-twelfth the mass of one atom of carbon-12 [1] (d) Ar of Cu = (63 × 69.1 + 65 × 30.9)/100 [1] = 63.6 [1] 6 (a) aluminium + chlorine → aluminium chloride [1] 2Al(s) + 3Cl2(g) → 2AlCl3(s) [1 for reactants, 1 for product ...
... (c) the average mass of the isotopes of an element [1] compared with one-twelfth the mass of one atom of carbon-12 [1] (d) Ar of Cu = (63 × 69.1 + 65 × 30.9)/100 [1] = 63.6 [1] 6 (a) aluminium + chlorine → aluminium chloride [1] 2Al(s) + 3Cl2(g) → 2AlCl3(s) [1 for reactants, 1 for product ...
Chemistry 134 Problem Set Introduction
... 14.38 (a) What is the difference between a sapphire and a ruby? (b) Why might aluminum be present with silicon in many minerals? 14.39 (a) List the stable oxidation states for each member of the boron family. (b) For any element that may have more than one stable oxidation state, identify the more s ...
... 14.38 (a) What is the difference between a sapphire and a ruby? (b) Why might aluminum be present with silicon in many minerals? 14.39 (a) List the stable oxidation states for each member of the boron family. (b) For any element that may have more than one stable oxidation state, identify the more s ...
Chapter 16 Aqueous Ionic Equilibrium Lecture Presentation
... • All ionic compounds dissolve in water to some degree. – However, many compounds have such low solubility in water that we classify them as insoluble. ...
... • All ionic compounds dissolve in water to some degree. – However, many compounds have such low solubility in water that we classify them as insoluble. ...
chemistry paper 1
... CHEMISTRY PAPER 1 ( S a m p l e P a p e r ) SECTION B : Question-Answer Book B ...
... CHEMISTRY PAPER 1 ( S a m p l e P a p e r ) SECTION B : Question-Answer Book B ...
Acids and Bases
... Saponification is commonly used to refer to the reaction of a metallic alkali (base) with a fat or oil to form soap. Saponifiable substances are those that can be converted into soap. ...
... Saponification is commonly used to refer to the reaction of a metallic alkali (base) with a fat or oil to form soap. Saponifiable substances are those that can be converted into soap. ...
NH 4 1+
... Now let’s look at the second reason a double replacement reaction might occur: the formation of a weak acid. An acid is a compound that has an H+ ion bonded to some negative ion: HNO3 for example is nitric acid. HF is hydrofluoric acid. All acids fall into one of two categories: strong acids and wea ...
... Now let’s look at the second reason a double replacement reaction might occur: the formation of a weak acid. An acid is a compound that has an H+ ion bonded to some negative ion: HNO3 for example is nitric acid. HF is hydrofluoric acid. All acids fall into one of two categories: strong acids and wea ...
Chapter 2 - San Joaquin Memorial High School
... The Greeks were the first to try to explain why chemical changes occur. By about 400 B.C. they had proposed that all matter was composed of four fundamental substances: fire, earth, water, and air. The Greeks also considered the question of whether matter is continuous, and thus infinitely divisible ...
... The Greeks were the first to try to explain why chemical changes occur. By about 400 B.C. they had proposed that all matter was composed of four fundamental substances: fire, earth, water, and air. The Greeks also considered the question of whether matter is continuous, and thus infinitely divisible ...
Gr. 11 Chemistry Student Workbook (Spring 2016)
... The most basic piece of personal protective equipment is a pair of goggles, and these will always be made available to students. Like a calculator for mathematics, and running shoes for physical education goggles are personal pieces of equipment best owned by students. When students own their own go ...
... The most basic piece of personal protective equipment is a pair of goggles, and these will always be made available to students. Like a calculator for mathematics, and running shoes for physical education goggles are personal pieces of equipment best owned by students. When students own their own go ...
Acids and Bases Unit
... This is a guessing question so be prepared for different responses. Most likely, that the light bulb will light up After testing the conductivity of the strong acid and before testing the weak acid in solution: o Did anything happen to the light bulb? Is that what we expected? If done correct ...
... This is a guessing question so be prepared for different responses. Most likely, that the light bulb will light up After testing the conductivity of the strong acid and before testing the weak acid in solution: o Did anything happen to the light bulb? Is that what we expected? If done correct ...
Welcome to AP Chemistry
... water, causing the water level in the cylinder to rise to 21.6 mL. Calculate the density of the metal. 2. The density of a piece of metal can be determined from mass and water displacement data. A piece of metal with a mass of 15.54 g is placed in a flask with a volume of 50.00 cm3. It is found that ...
... water, causing the water level in the cylinder to rise to 21.6 mL. Calculate the density of the metal. 2. The density of a piece of metal can be determined from mass and water displacement data. A piece of metal with a mass of 15.54 g is placed in a flask with a volume of 50.00 cm3. It is found that ...
Welcome to AP Chemistry
... water, causing the water level in the cylinder to rise to 21.6 mL. Calculate the density of the metal. 2. The density of a piece of metal can be determined from mass and water displacement data. A piece of metal with a mass of 15.54 g is placed in a flask with a volume of 50.00 cm3. It is found that ...
... water, causing the water level in the cylinder to rise to 21.6 mL. Calculate the density of the metal. 2. The density of a piece of metal can be determined from mass and water displacement data. A piece of metal with a mass of 15.54 g is placed in a flask with a volume of 50.00 cm3. It is found that ...
Multiple-choice questions : 1. Which of the following solutions
... Each question below consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table ...
... Each question below consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table ...
PURPOSE: To determine the value of the equilibrium constant for a
... There is a universal tendency of metal ions to form complexes with negatively charged ions (e.g. SCN -) and with neutral molecules (e.g., water, H2O, and ammonia, NH3) that have lone pairs of electrons (nonbonding pairs). This tendency can be understood as the result of the attractive force between ...
... There is a universal tendency of metal ions to form complexes with negatively charged ions (e.g. SCN -) and with neutral molecules (e.g., water, H2O, and ammonia, NH3) that have lone pairs of electrons (nonbonding pairs). This tendency can be understood as the result of the attractive force between ...
8 SHS Ch 8 Lecture shs_ch_8_lecture_2012
... A ll compounds of Group 1 and NH4+ are soluble. A ll nitrates are soluble. A ll halogens , except those of Ag+ and Pb 2 + are soluble. A ll sulfates, except those of Group 2, Ag+, and Pb2+ ar e soluble. A ll carbonates, except those of Group 1 and NH4+, ar e soluble. ...
... A ll compounds of Group 1 and NH4+ are soluble. A ll nitrates are soluble. A ll halogens , except those of Ag+ and Pb 2 + are soluble. A ll sulfates, except those of Group 2, Ag+, and Pb2+ ar e soluble. A ll carbonates, except those of Group 1 and NH4+, ar e soluble. ...
Amount of Substance
... proton and 1 electron. Since the mass of an electron is negligible compared to that of a proton or a neutron, the hydrogen atom has only 1/12 the mass of a carbon atom; therefore the relative atomic mass of hydrogen is 1. Similarly, the relative mass of an oxygen atom, which contains 8 protons, 8 ne ...
... proton and 1 electron. Since the mass of an electron is negligible compared to that of a proton or a neutron, the hydrogen atom has only 1/12 the mass of a carbon atom; therefore the relative atomic mass of hydrogen is 1. Similarly, the relative mass of an oxygen atom, which contains 8 protons, 8 ne ...
Chemical Bonding
... Explaining the Properties of Ionic Compounds Ionic compounds have similar properties: They are solids at SATP with high melting points, and they are electrolytes. We can hypothesize that these properties might be the result of the bonds formed between the ions, holding them firmly in a rigid structu ...
... Explaining the Properties of Ionic Compounds Ionic compounds have similar properties: They are solids at SATP with high melting points, and they are electrolytes. We can hypothesize that these properties might be the result of the bonds formed between the ions, holding them firmly in a rigid structu ...
Active Learning Questions
... 31. Of the hydrogen halides, only HF is a weak acid. Give a possible explanation. 32. Explain why the following are done, both of which are related to acid–base chemistry. a. Power plants burning coal with high sulfur content use scrubbers to help eliminate sulfur emissions. b. A gardener mixes lime ...
... 31. Of the hydrogen halides, only HF is a weak acid. Give a possible explanation. 32. Explain why the following are done, both of which are related to acid–base chemistry. a. Power plants burning coal with high sulfur content use scrubbers to help eliminate sulfur emissions. b. A gardener mixes lime ...
chem - CBSE Guess
... Rancidity: The oily and fatty food oxidizes and give bad smell and test is called rancidity.Preventatioin:By adding antioxidant which slow down the process of oxidation.2. Vaccum packing,3Flusing N2 gas in chips packets.3.Refrigeration. Q.Explain the various types of reactions with one example of ea ...
... Rancidity: The oily and fatty food oxidizes and give bad smell and test is called rancidity.Preventatioin:By adding antioxidant which slow down the process of oxidation.2. Vaccum packing,3Flusing N2 gas in chips packets.3.Refrigeration. Q.Explain the various types of reactions with one example of ea ...
Oxidation Numbers
... Rules for Assigning Other Oxidation Numbers: All of the oxidation numbers in a molecule/ion must add up to equal the charge on the molecule/ion ...
... Rules for Assigning Other Oxidation Numbers: All of the oxidation numbers in a molecule/ion must add up to equal the charge on the molecule/ion ...
PRACTICE EXAM 1-C
... sulfuric acid with potassium hydroxide. (You do not need to include state symbols such as (s), (aq), etc.) (You may wish to write the complete reaction and do some work on scrap paper, but we will only grade the net-ionic reaction written in the box below.) (2 pts) ...
... sulfuric acid with potassium hydroxide. (You do not need to include state symbols such as (s), (aq), etc.) (You may wish to write the complete reaction and do some work on scrap paper, but we will only grade the net-ionic reaction written in the box below.) (2 pts) ...
File
... several minutes to remove excess H2O2. If solution is green, add more H2O2. (yellow is okay) Look for separation of precipitate and supernatant. Centrifuge, decant and obtain residue 2 for step 6, and decantate 2 for step 12. Do not discard. If necessary, recentrifuge decantate 2 until absolutely cl ...
... several minutes to remove excess H2O2. If solution is green, add more H2O2. (yellow is okay) Look for separation of precipitate and supernatant. Centrifuge, decant and obtain residue 2 for step 6, and decantate 2 for step 12. Do not discard. If necessary, recentrifuge decantate 2 until absolutely cl ...
Hydroxide
Hydroxide is a diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a covalent bond, and carries a negative electric charge. It is an important but usually minor constituent of water. It functions as a base, a ligand, a nucleophile and a catalyst. The hydroxide ion forms salts, some of which dissociate in aqueous solution, liberating solvated hydroxide ions. Sodium hydroxide is a multi-million-ton per annum commodity chemical. A hydroxide attached to a strongly electropositive center may itself ionize, liberating a hydrogen cation (H+), making the parent compound an acid.The corresponding electrically neutral compound •HO is the hydroxyl radical. The corresponding covalently-bound group -OH of atoms is the hydroxyl group.Hydroxide ion and hydroxyl group are nucleophiles and can act as a catalyst in organic chemistry.Many inorganic substances which bear the word ""hydroxide"" in their names are not ionic compounds of the hydroxide ion, but covalent compounds which contain hydroxyl groups.