Carrying Charges
... Make sure the participants do not mix up the solid chemicals and the spoons used to dispense the chemicals. Contaminating sugar with even a little bit of salt will create confusing results. Participants can test other liquids such as juices if they are available. All liquids used should be discarded ...
... Make sure the participants do not mix up the solid chemicals and the spoons used to dispense the chemicals. Contaminating sugar with even a little bit of salt will create confusing results. Participants can test other liquids such as juices if they are available. All liquids used should be discarded ...
******************Q***********Q*******Q****** Q***Q***Q***Q***Q***Q
... Ice is ordered with an open structure to optimize H-bonding. Therefore, ice is less dense than water. In water the H-O bond length is 1.0 Å. The O…H hydrogen bond length is 1.8 Å. Ice has waters arranged in an open, regular hexagon. Each + H points towards a lone pair on O. Ice floats, so it forms ...
... Ice is ordered with an open structure to optimize H-bonding. Therefore, ice is less dense than water. In water the H-O bond length is 1.0 Å. The O…H hydrogen bond length is 1.8 Å. Ice has waters arranged in an open, regular hexagon. Each + H points towards a lone pair on O. Ice floats, so it forms ...
Unit 8 Homework Packet
... b. What is the percent yield if only 145 g of XeF4 is actually isolated? ...
... b. What is the percent yield if only 145 g of XeF4 is actually isolated? ...
Chemistry B11 Chapter 4 Chemical reactions
... using chemical formulas for the reactants and products, and an arrow to indicate the direction in which the reaction proceeds. Note: It is important to show the state of each reactant and product in a chemical equation (immediately following each reactant and product). We use the symbol (g) for gas, ...
... using chemical formulas for the reactants and products, and an arrow to indicate the direction in which the reaction proceeds. Note: It is important to show the state of each reactant and product in a chemical equation (immediately following each reactant and product). We use the symbol (g) for gas, ...
普通化学 (全英文) 教学大纲
... (c)．How to fill electrons in different orbitals (d)．Be able to draw the electron configuration of the first 20 elements (e)．Unpaired electrons, Spin, Paramagnetic and Diamagnetism 2.5．Comparing the atomic orbitals with Bohr’s model of atoms (Classical but incorrect) 2.6．Electron’s states (a)．Each st ...
... (c)．How to fill electrons in different orbitals (d)．Be able to draw the electron configuration of the first 20 elements (e)．Unpaired electrons, Spin, Paramagnetic and Diamagnetism 2.5．Comparing the atomic orbitals with Bohr’s model of atoms (Classical but incorrect) 2.6．Electron’s states (a)．Each st ...
MCQ plus answers
... An enzyme is a protein that is a highly efficient catalyst for one or more chemical reactions in a living system. ...
... An enzyme is a protein that is a highly efficient catalyst for one or more chemical reactions in a living system. ...
Starter
... D False - water is made up of hydrogen and oxygen atoms joined together Corrected D explains C E True F False – there are about 100 different elements. Corrected F does not explain E G False – chlorine is a dangerous gas and sodium is a dangerous metal, but sodium chloride is safe H False – a compou ...
... D False - water is made up of hydrogen and oxygen atoms joined together Corrected D explains C E True F False – there are about 100 different elements. Corrected F does not explain E G False – chlorine is a dangerous gas and sodium is a dangerous metal, but sodium chloride is safe H False – a compou ...
Chemistry II Exams and Keys 2013 Season
... Chemistry II Exam March 2013 Answer the following questions on the answer sheet provided. Each correct response is worth 4 points. Use the letters in parentheses for your answers. Choose the letter that best completes or answers the item. Be certain that erasures are complete. Please PRINT your name ...
... Chemistry II Exam March 2013 Answer the following questions on the answer sheet provided. Each correct response is worth 4 points. Use the letters in parentheses for your answers. Choose the letter that best completes or answers the item. Be certain that erasures are complete. Please PRINT your name ...
C3 Revision Question Booklet
... List A gives the names of four compounds in solution. List B gives tests and the result of the tests. Draw a straight line from each compound in List A to its test and test result in List B. The first one has been done for you. ...
... List A gives the names of four compounds in solution. List B gives tests and the result of the tests. Draw a straight line from each compound in List A to its test and test result in List B. The first one has been done for you. ...
Chemical Reactions
... How do you get Fe2 from Fe and O3 from O2? We do this by balancing equations. 4Fe + 3O2 → 2Fe2O3 You cannot make or destroy matter! It also helps to know if it is solid, liquid or gas. 4Fe(s) + 3O2(g)→ 2Fe2O3(s) ...
... How do you get Fe2 from Fe and O3 from O2? We do this by balancing equations. 4Fe + 3O2 → 2Fe2O3 You cannot make or destroy matter! It also helps to know if it is solid, liquid or gas. 4Fe(s) + 3O2(g)→ 2Fe2O3(s) ...
3. Chemical changes and Structure Unit Questions
... 24. (a) Atoms of different elements have different attractions for bonded electrons. What term is used as a measure of the attraction an atom involved in a bond has for the electrons of the bond? (1) (b) Atoms of different elements are different sizes. What is the trend in atomic size across the per ...
... 24. (a) Atoms of different elements have different attractions for bonded electrons. What term is used as a measure of the attraction an atom involved in a bond has for the electrons of the bond? (1) (b) Atoms of different elements are different sizes. What is the trend in atomic size across the per ...
Types of Measurement
... 1. Ionic: made up of ions of opposite charge A. strong electrostatic force of attraction; ionic bond B. electrons are transferred 2. Covalent: made up of two or more nonmetals A. electrons are shared ...
... 1. Ionic: made up of ions of opposite charge A. strong electrostatic force of attraction; ionic bond B. electrons are transferred 2. Covalent: made up of two or more nonmetals A. electrons are shared ...
ppt
... From a calorimetry experiment, a student determines that the specific heat of solution of KBrO3 (s) is an endothermic 0.25 kJ/g. Calculate the molar heat of solution and write the ...
... From a calorimetry experiment, a student determines that the specific heat of solution of KBrO3 (s) is an endothermic 0.25 kJ/g. Calculate the molar heat of solution and write the ...
Redox Reactions and Electrochemistry
... must equal the number gained by the reduced one) 7) Add half-reactions and cancel electrons and other common species on left and right sides of the equation. 8) Check Reaction! It should be balanced in terms of oxidation states, charge and atoms. IF NOT, YOU HAVE MADE A MISTAKE! ...
... must equal the number gained by the reduced one) 7) Add half-reactions and cancel electrons and other common species on left and right sides of the equation. 8) Check Reaction! It should be balanced in terms of oxidation states, charge and atoms. IF NOT, YOU HAVE MADE A MISTAKE! ...
Chapter 1 - TamAPChemistryHart
... Hydrogen gas is produced when zinc reacts with sulfuric acid: Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g) If 159 mL of wet H2 is collected over water at 24oC and a barometric pressure of 738 torr, how many grams of Zn have been consumed? (The vapor pressure of H2O at 24oC is 22.38 torr.) ...
... Hydrogen gas is produced when zinc reacts with sulfuric acid: Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g) If 159 mL of wet H2 is collected over water at 24oC and a barometric pressure of 738 torr, how many grams of Zn have been consumed? (The vapor pressure of H2O at 24oC is 22.38 torr.) ...
File
... C) remains the same 101. At STP, a sample of which element has the highest entropy? A) Na(s) B) Hg( ) C) Br 2( ) D) F2(g) 102. A sample of a gas is contained in a closed rigid cylinder. According to kinetic molecular theory, what occurs when the gas inside the cylinder is heated? A) The number of ga ...
... C) remains the same 101. At STP, a sample of which element has the highest entropy? A) Na(s) B) Hg( ) C) Br 2( ) D) F2(g) 102. A sample of a gas is contained in a closed rigid cylinder. According to kinetic molecular theory, what occurs when the gas inside the cylinder is heated? A) The number of ga ...
Praxis II Chemistry prep
... 1. Draw representations of solid, liquid and gas at the atomic level. How are your drawings different? How the same? 1. What happens to a gas volume when it is compressed? What happens to a liquid volume when it is compressed? What happens to a solid volume when it is compressed? 1. What happens to ...
... 1. Draw representations of solid, liquid and gas at the atomic level. How are your drawings different? How the same? 1. What happens to a gas volume when it is compressed? What happens to a liquid volume when it is compressed? What happens to a solid volume when it is compressed? 1. What happens to ...
Document
... 12.When 20 gm of an acid (C11H8O2) is dissolved in 50 gm benzene (K f=1.72K kg mol‐1) a freezing point depression of 2K is observed.Thevant Hoff’s factor is ...
... 12.When 20 gm of an acid (C11H8O2) is dissolved in 50 gm benzene (K f=1.72K kg mol‐1) a freezing point depression of 2K is observed.Thevant Hoff’s factor is ...
Chemistry II Exams and Answer Keys 2015 Season
... Ni2+(aq) + 2C4H8N2O2 → Νi(C8H14ON4O4)2(s) + 2H+(aq) The precipitate is filtered and washed. Then, it is heated gently to dryness. The precipitate weighs 3.601 g. What is the mass percentage of Ni in the ore? Ni(C8H14ON4O4)2 = 288.94 g/mol and C4H8N2O2 = 116 g/mol. A. 73.0 % B. 36.2 % C. 65.1 % D. 48 ...
... Ni2+(aq) + 2C4H8N2O2 → Νi(C8H14ON4O4)2(s) + 2H+(aq) The precipitate is filtered and washed. Then, it is heated gently to dryness. The precipitate weighs 3.601 g. What is the mass percentage of Ni in the ore? Ni(C8H14ON4O4)2 = 288.94 g/mol and C4H8N2O2 = 116 g/mol. A. 73.0 % B. 36.2 % C. 65.1 % D. 48 ...
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. ...
AP® Chemistry 2009 Free-Response Questions Form B
... It is to your advantage to do this, since you may obtain partial credit if you do and you will receive little or no credit if you do not. Attention should be paid to significant figures. Be sure to write all your answers to the questions on the lined pages following each question in this booklet. Do ...
... It is to your advantage to do this, since you may obtain partial credit if you do and you will receive little or no credit if you do not. Attention should be paid to significant figures. Be sure to write all your answers to the questions on the lined pages following each question in this booklet. Do ...
Electrolysis of water
Electrolysis of water is the decomposition of water (H2O) into oxygen (O2) and hydrogen gas (H2) due to an electric current being passed through the water.This technique can be used to make hydrogen fuel (hydrogen gas) and breathable oxygen; though currently most industrial methods make hydrogen fuel from natural gas instead.