Open questions (66 points total
... (NOTE There are 2 NMR spectra with this problem. Below the 1H spectrum, the integrals (= areas) of the signals are given as numbers ratios). From the IR spectrum of an unknown substance X with M = 102, we know X to be an ester. 6p 1 Calculate the molecular formula of substance X. Give all possible ...
... (NOTE There are 2 NMR spectra with this problem. Below the 1H spectrum, the integrals (= areas) of the signals are given as numbers ratios). From the IR spectrum of an unknown substance X with M = 102, we know X to be an ester. 6p 1 Calculate the molecular formula of substance X. Give all possible ...
X012/11/02
... zinc, would give the highest cell voltage? (You may wish to use the data booklet to help you.) A Copper B Iron C Magnesium D Tin ...
... zinc, would give the highest cell voltage? (You may wish to use the data booklet to help you.) A Copper B Iron C Magnesium D Tin ...
Atoms, Molecules and Ions - Moodle @ FCT-UNL
... Strategy Note that the compounds in (a) and (b) contain both metal and nonmetal atoms, so we expect them to be ionic compounds. There are no metal atoms in (c) but there is an ammonium group, which bears a positive charge. So NH4ClO3 is also an ionic compound. Our reference for the names of cations ...
... Strategy Note that the compounds in (a) and (b) contain both metal and nonmetal atoms, so we expect them to be ionic compounds. There are no metal atoms in (c) but there is an ammonium group, which bears a positive charge. So NH4ClO3 is also an ionic compound. Our reference for the names of cations ...
Chapter 2 PowerPoint
... Strategy Note that the compounds in (a) and (b) contain both metal and nonmetal atoms, so we expect them to be ionic compounds. There are no metal atoms in (c) but there is an ammonium group, which bears a positive charge. So NH 4ClO3 is also an ionic compound. Our reference for the names of cations ...
... Strategy Note that the compounds in (a) and (b) contain both metal and nonmetal atoms, so we expect them to be ionic compounds. There are no metal atoms in (c) but there is an ammonium group, which bears a positive charge. So NH 4ClO3 is also an ionic compound. Our reference for the names of cations ...
Chemistry
... 11. use chemical skills in contexts which bring together different areas of the subject. These assessment objectives cannot be precisely specified in the Syllabus Content because questions testing such skills may be based on information which is unfamiliar to the candidate. In answering such questio ...
... 11. use chemical skills in contexts which bring together different areas of the subject. These assessment objectives cannot be precisely specified in the Syllabus Content because questions testing such skills may be based on information which is unfamiliar to the candidate. In answering such questio ...
Enzymes
... stress on bonds that must be broken, making it easier to reach the transition state. R groups at the active site may create a conducive microenvironment for a specific reaction. Enzymes may even bind covalently to substrates in an intermediate step before returning to normal. ...
... stress on bonds that must be broken, making it easier to reach the transition state. R groups at the active site may create a conducive microenvironment for a specific reaction. Enzymes may even bind covalently to substrates in an intermediate step before returning to normal. ...
Ch 13 kinetics
... More than a balanced chemical equation, a reaction mechanism ________________________________________ . Provides a detailed picture of how a reaction occurs. Elementary step: Any process that occurs ____________________________________________________________________ Makes either ___________________ ...
... More than a balanced chemical equation, a reaction mechanism ________________________________________ . Provides a detailed picture of how a reaction occurs. Elementary step: Any process that occurs ____________________________________________________________________ Makes either ___________________ ...
Ms - cloudfront.net
... 18. Describe how a cation and an anion is formed. 19. What do metals typically do when they become ions? What about nonmetals? 20. What type of elements bond together in ionic bonds? covalent bonds? metallic bonds? 21. How do electrons in ionic bonding interact? Covalent bonding? 22. How does the re ...
... 18. Describe how a cation and an anion is formed. 19. What do metals typically do when they become ions? What about nonmetals? 20. What type of elements bond together in ionic bonds? covalent bonds? metallic bonds? 21. How do electrons in ionic bonding interact? Covalent bonding? 22. How does the re ...
Topic 16 Some non-metals and their compounds notes
... this has fewer moles of gas. Therefore, the yield of sulfur(VI) oxide will increase. When pure oxygen is used, the volume reduction is from 3 volumes to 2. If air is used instead of oxygen, one volume of oxygen will be accompanied by 4 volumes of unreactive nitrogen. Therefore the volume reduction w ...
... this has fewer moles of gas. Therefore, the yield of sulfur(VI) oxide will increase. When pure oxygen is used, the volume reduction is from 3 volumes to 2. If air is used instead of oxygen, one volume of oxygen will be accompanied by 4 volumes of unreactive nitrogen. Therefore the volume reduction w ...
Formulation - Good Hope School
... (a) A ship’s hull is made from iron. Blocks of another metal are attached to the hull to prevent the iron from rusting. (i) Suggest what this metal might be. [1 mark] Zinc/ magnesium [1] (ii) Explain how the metal named in (a) (i) protects iron from rusting. [1 mark] Zn/ Mg is more reactive than iro ...
... (a) A ship’s hull is made from iron. Blocks of another metal are attached to the hull to prevent the iron from rusting. (i) Suggest what this metal might be. [1 mark] Zinc/ magnesium [1] (ii) Explain how the metal named in (a) (i) protects iron from rusting. [1 mark] Zn/ Mg is more reactive than iro ...
Atoms, Molecules and Ions
... Because H2SO3 has one fewer O atom, it is called sulfurous acid. (b) Because H3AsO4 is arsenic acid, the AsO43− is named arsenate. The H2AsO4− anion is formed by adding two H+ ions to AsO43−, so H2AsO4− is called dihydrogen arsenate. (c) The parent acid is H2SeO3. Because the acid has one fewer O at ...
... Because H2SO3 has one fewer O atom, it is called sulfurous acid. (b) Because H3AsO4 is arsenic acid, the AsO43− is named arsenate. The H2AsO4− anion is formed by adding two H+ ions to AsO43−, so H2AsO4− is called dihydrogen arsenate. (c) The parent acid is H2SeO3. Because the acid has one fewer O at ...
NC Exam Questions - Rosshall Academy
... (d) Aldehydes can also be formed by the reaction of some alcohols with copper(II) oxide. Name the type of alcohol that would react with copper(II) oxide to form an aldehyde. ...
... (d) Aldehydes can also be formed by the reaction of some alcohols with copper(II) oxide. Name the type of alcohol that would react with copper(II) oxide to form an aldehyde. ...
CHEMISTRY SEC 06 SYLLABUS
... 4. Scheme of Assessment The examination will consist of two written papers, each of two hours’ duration, and an asessment of practical work in chemistry. Questions will be set in English and must be answered in English. The examination will be structured as follows: Paper I consists of a written pap ...
... 4. Scheme of Assessment The examination will consist of two written papers, each of two hours’ duration, and an asessment of practical work in chemistry. Questions will be set in English and must be answered in English. The examination will be structured as follows: Paper I consists of a written pap ...
Chapter 3
... produced if there is enough oxygen gas to react with all of the CO. A) 7.20 mol B) 44.0 mol C) 3.60 mol D) 1.80 mol Nitrous oxide (N2O) is also called “laughing gas.” It can be prepared by the thermal decomposition of ammonium nitrate (NH4NO3). The other product is H2O. The balanced equation for thi ...
... produced if there is enough oxygen gas to react with all of the CO. A) 7.20 mol B) 44.0 mol C) 3.60 mol D) 1.80 mol Nitrous oxide (N2O) is also called “laughing gas.” It can be prepared by the thermal decomposition of ammonium nitrate (NH4NO3). The other product is H2O. The balanced equation for thi ...
C 3 H 8 (g) - Ms Critchley`s Lab
... 6. C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(l) 7. C2H4(g) + H2(g) C2H6(g) 8. 2C2H6(l) + 7O2(g) 4CO2(g) + 6H2O(l) Write the equation for ΔHc for 9. H2(g) + ½ O2(g) H2O(l) 10. CH3OH(l) + O2(g) CO2(g) + H2O(l) 11. C(s) + O2(g) CO2(g) ...
... 6. C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(l) 7. C2H4(g) + H2(g) C2H6(g) 8. 2C2H6(l) + 7O2(g) 4CO2(g) + 6H2O(l) Write the equation for ΔHc for 9. H2(g) + ½ O2(g) H2O(l) 10. CH3OH(l) + O2(g) CO2(g) + H2O(l) 11. C(s) + O2(g) CO2(g) ...
AP Chemistry Summer Assignment
... atm and the temperature is 33˚C? 77. On a warm day, an amusement park balloon is filled with 47.8 g He. The temperature is 33˚C and the pressure in the balloon is 2.25 atm. Calculate the volume of the balloon. 78. A drum use to transport crude oil has a volume of 162 L. How many water molecules, as ...
... atm and the temperature is 33˚C? 77. On a warm day, an amusement park balloon is filled with 47.8 g He. The temperature is 33˚C and the pressure in the balloon is 2.25 atm. Calculate the volume of the balloon. 78. A drum use to transport crude oil has a volume of 162 L. How many water molecules, as ...
+ 2 H2O(l Ca(OH)2 aq)
... c) Sulfur dioxide, SO2, is a nonmetal oxide that reacts with oxygen, O2, to form the higher oxide, SO3. Δ 2 SO (g) 2 SO2(g) + O2(g) ── ...
... c) Sulfur dioxide, SO2, is a nonmetal oxide that reacts with oxygen, O2, to form the higher oxide, SO3. Δ 2 SO (g) 2 SO2(g) + O2(g) ── ...
chapter 7-Chemical Bonding
... • Na+ sodium ion, Ca2+, Al3+ -- cations • Cl- chloride ion, O2-, N3- -- anions ...
... • Na+ sodium ion, Ca2+, Al3+ -- cations • Cl- chloride ion, O2-, N3- -- anions ...
The masses of reactants and products are equal.
... Chemical formulas can have both coefficients and subscripts. In these cases, multiply the two numbers together to find the number of atoms involved in the reaction. For example, two water molecules (2H2O) contain 2 • 2 = 4 hydrogen atoms and 2 • 1 = 2 oxygen atoms. Remember, coefficients in a chemic ...
... Chemical formulas can have both coefficients and subscripts. In these cases, multiply the two numbers together to find the number of atoms involved in the reaction. For example, two water molecules (2H2O) contain 2 • 2 = 4 hydrogen atoms and 2 • 1 = 2 oxygen atoms. Remember, coefficients in a chemic ...
Paper - Revision Science
... D it cannot be poisoned. (Total for Question 12 = 1 mark) 13 In the reaction of benzene with chloromethane, aluminium chloride is added because it reacts with A benzene to produce an electrophile. B benzene to produce a nucleophile. C chloromethane to produce a nucleophile. D chloromethane to produc ...
... D it cannot be poisoned. (Total for Question 12 = 1 mark) 13 In the reaction of benzene with chloromethane, aluminium chloride is added because it reacts with A benzene to produce an electrophile. B benzene to produce a nucleophile. C chloromethane to produce a nucleophile. D chloromethane to produc ...
Chemical Reactions and Equations - 2012 Book Archive
... that react or are produced. We do this one element at a time, going from one side of the reaction to the other, changing the number of molecules of a substance until all elements have the same number of atoms on each side. To accommodate the two oxygen atoms as reactants, let us assume that we have ...
... that react or are produced. We do this one element at a time, going from one side of the reaction to the other, changing the number of molecules of a substance until all elements have the same number of atoms on each side. To accommodate the two oxygen atoms as reactants, let us assume that we have ...
CH1710 PrEX#2 Sp2013 answers
... B) 2 K+(aq) + SO42-(aq) → K2SO4(s) C) H+(aq) + OH-(aq) + 2 K+(aq) + SO42-(aq) → H2O(l) + K2SO4(s) D) H22+(aq) + OH-(aq) → H2(OH)2(l) _____ 18. The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution ...
... B) 2 K+(aq) + SO42-(aq) → K2SO4(s) C) H+(aq) + OH-(aq) + 2 K+(aq) + SO42-(aq) → H2O(l) + K2SO4(s) D) H22+(aq) + OH-(aq) → H2(OH)2(l) _____ 18. The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution ...
Deans Community High School Intermediate 2 Revision Notes www
... As we have seen, reactions are more likely to take place when high concentrations, large surface areas and high temperatures are used. These factors increase the likelihood of collisions of the reactants, and the more energy that these collision have, the more likely it will be that these collisions ...
... As we have seen, reactions are more likely to take place when high concentrations, large surface areas and high temperatures are used. These factors increase the likelihood of collisions of the reactants, and the more energy that these collision have, the more likely it will be that these collisions ...
physical setting chemistry
... 55 Using the symbols A and Q, write the chemical formula of the product. [1] 56 Identify the type of chemical bond between an atom of element A and an atom of element Q. [1] 57 Compare the total mass of the reactants to the total mass of the product. [1] 58 A potential energy diagram for a chemical ...
... 55 Using the symbols A and Q, write the chemical formula of the product. [1] 56 Identify the type of chemical bond between an atom of element A and an atom of element Q. [1] 57 Compare the total mass of the reactants to the total mass of the product. [1] 58 A potential energy diagram for a chemical ...
Redox
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.