towards the synthesis of functionalised macrocyclic receptors
... A practical route to the synthesis of two new macrocyclic thio-crown ethers, 13bromo-3,6,9-trithia-15-azabicyclo[9.3.1]pentadeca-1(15),11,13-triene, 82, and 13bromo-3,6,9-trithia-15-azabicyclo[9.3.1]pentadeca-1(15),11,13-triene-15-oxide, 84, is described. Both macrocycles were fully characterised us ...
... A practical route to the synthesis of two new macrocyclic thio-crown ethers, 13bromo-3,6,9-trithia-15-azabicyclo[9.3.1]pentadeca-1(15),11,13-triene, 82, and 13bromo-3,6,9-trithia-15-azabicyclo[9.3.1]pentadeca-1(15),11,13-triene-15-oxide, 84, is described. Both macrocycles were fully characterised us ...
exam2gc1sum11+key
... C8H8 + 10O2(g) → 8CO2(g) + 4H2O(l) ΔH°rxn = –4439 kJ/mol A. 143 kJ/mol B. -143 kJ/mol C. 8735 kJ/mol D. –3759 kJ/mol ____18. A gas is allowed to expand doing 5 J of work. If the gas absorbs 250 J of heat from the surroundings, what is the change in internal energy? A. 255 J B. – 255 J C. 245 J D. -2 ...
... C8H8 + 10O2(g) → 8CO2(g) + 4H2O(l) ΔH°rxn = –4439 kJ/mol A. 143 kJ/mol B. -143 kJ/mol C. 8735 kJ/mol D. –3759 kJ/mol ____18. A gas is allowed to expand doing 5 J of work. If the gas absorbs 250 J of heat from the surroundings, what is the change in internal energy? A. 255 J B. – 255 J C. 245 J D. -2 ...
Predicting Equations Reference #2
... ammonium cations and of nitrate and acetate anions. All chlorides are soluble except those of silver, lead, and mercury(I) ions. All sulfates are soluble except those of lead, calcium, strontium, and barium. All other salts should be considered only slightly soluble. I suggest encouraging students t ...
... ammonium cations and of nitrate and acetate anions. All chlorides are soluble except those of silver, lead, and mercury(I) ions. All sulfates are soluble except those of lead, calcium, strontium, and barium. All other salts should be considered only slightly soluble. I suggest encouraging students t ...
MOLES AND CALCULATIONS USING THE MOLE CONCEPT
... many elementary entities as there are atoms in exactly 1.00 g of hydrogen-1. 2. A mole is the amount ... in exactly 12.00 g of carbon-12. 3. 6.02 x 1023 of anything 4. It is important to state the entities involved: atoms, molecules, ions, electrons, etc. 5. How large a number is this? ...
... many elementary entities as there are atoms in exactly 1.00 g of hydrogen-1. 2. A mole is the amount ... in exactly 12.00 g of carbon-12. 3. 6.02 x 1023 of anything 4. It is important to state the entities involved: atoms, molecules, ions, electrons, etc. 5. How large a number is this? ...
IB Chemistry HL Topic5 Questions 1. Which
... What are the signs of ∆Hο and ∆S ο for a reaction that is non-spontaneous at low temperature but spontaneous at high temperature? ...
... What are the signs of ∆Hο and ∆S ο for a reaction that is non-spontaneous at low temperature but spontaneous at high temperature? ...
Distinguishing the Atom Reading
... Table 4.2 shows that a fluorine atom has an atomic number of 9 and a mass number of 19. Since the atomic number equals the number of protons, which equals the number of electrons, a fluorine atom has nine protons and nine electrons. The mass number of fluorine is equal to the number of protons plus ...
... Table 4.2 shows that a fluorine atom has an atomic number of 9 and a mass number of 19. Since the atomic number equals the number of protons, which equals the number of electrons, a fluorine atom has nine protons and nine electrons. The mass number of fluorine is equal to the number of protons plus ...
The masses of reactants and products are equal.
... In many other chemical reactions, mass also appears to decrease. That is, the mass of the products appears to be less than the mass of the reactants. In other reactions, the products appear to gain mass. For example, plants grow through a complex series of reactions, but where does their extra mass ...
... In many other chemical reactions, mass also appears to decrease. That is, the mass of the products appears to be less than the mass of the reactants. In other reactions, the products appear to gain mass. For example, plants grow through a complex series of reactions, but where does their extra mass ...
Stoichiometry intro
... substances that react and form during a chemical reaction. These numbers are fixed - they do not change We can use these ratios to predict the amounts of substances that react and form in a reaction when any amount of a substance is reacted. The conversion factor we use to make these predictions ...
... substances that react and form during a chemical reaction. These numbers are fixed - they do not change We can use these ratios to predict the amounts of substances that react and form in a reaction when any amount of a substance is reacted. The conversion factor we use to make these predictions ...
Atoms, Molecules, and Ions
... called molecules13. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance. In some respects, a molecule is similar to an atom. A molecule, however, is composed of more than one atom. Some elements exist naturally as molecules. For example, hyd ...
... called molecules13. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance. In some respects, a molecule is similar to an atom. A molecule, however, is composed of more than one atom. Some elements exist naturally as molecules. For example, hyd ...
Chapter 3 Chemical Compounds
... Binary molecular compounds are compounds made of two types of atoms (binary) that form molecules. In binary molecular compounds, the two types of atoms are nonmetals (or sometimes metalloids). The general rule for naming binary compounds is to list the name of the first element and then list the nam ...
... Binary molecular compounds are compounds made of two types of atoms (binary) that form molecules. In binary molecular compounds, the two types of atoms are nonmetals (or sometimes metalloids). The general rule for naming binary compounds is to list the name of the first element and then list the nam ...
Section 5 – Harry Moseley: Numbering the
... Possible Student Answers: Many students may know that electricity refers to the movement of electrons, and some students may know that electricity refers to the movement of both electrons and ions. EVERYDAY APPLICATION 1: A Geissler tube is a kind of cathode ray tube (CRT). CRTs have served many pur ...
... Possible Student Answers: Many students may know that electricity refers to the movement of electrons, and some students may know that electricity refers to the movement of both electrons and ions. EVERYDAY APPLICATION 1: A Geissler tube is a kind of cathode ray tube (CRT). CRTs have served many pur ...
Thermochemistry
... Note that this is a positive number and therefore the reaction in endothermic. This could have been deduced by inspection since the final temperature is less than the initial temperature and therefore heat must have been absorbed from the water in the coffee cup calorimeter Phase transitions; Change ...
... Note that this is a positive number and therefore the reaction in endothermic. This could have been deduced by inspection since the final temperature is less than the initial temperature and therefore heat must have been absorbed from the water in the coffee cup calorimeter Phase transitions; Change ...
atom - Huntington Catholic School
... theory in 1803. His theory stated that all substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed. Atoms of the same element are exactly alike, and atoms of different elements are different. Atoms join with other atoms to make new substances. • Not Quit ...
... theory in 1803. His theory stated that all substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed. Atoms of the same element are exactly alike, and atoms of different elements are different. Atoms join with other atoms to make new substances. • Not Quit ...
honors chemistry harvard-westlake second semester final exam
... How are you going to prepare for the Final Exam? The best preparation for the final exam is consistent study habits and effort throughout the year. We know that a lot of material has gone down the lab sink, so to speak, and so we also have some suggestions for areas you should concentrate on as you ...
... How are you going to prepare for the Final Exam? The best preparation for the final exam is consistent study habits and effort throughout the year. We know that a lot of material has gone down the lab sink, so to speak, and so we also have some suggestions for areas you should concentrate on as you ...
Symbol Protons Neutons Electrons Name
... Cations form when atoms loose electrons. • A-group metals form only one kind of cation, consistent with their position in the Periodic Table. Cations have the same name as the atoms from which they are derived. • B-group (transition) metals can form two or more different ions. To name them, a Roman ...
... Cations form when atoms loose electrons. • A-group metals form only one kind of cation, consistent with their position in the Periodic Table. Cations have the same name as the atoms from which they are derived. • B-group (transition) metals can form two or more different ions. To name them, a Roman ...
Chemistry (B) Final Exam Study Guide 3
... ____ 68. Which of the following statements is NOT true about the decomposition of a simple binary compound? a. The products are unpredictable. b. The products are the constituent elements. c. The reactant is a single substance. d. The reactant could be an ionic or a molecular compound. ____ 69. Whic ...
... ____ 68. Which of the following statements is NOT true about the decomposition of a simple binary compound? a. The products are unpredictable. b. The products are the constituent elements. c. The reactant is a single substance. d. The reactant could be an ionic or a molecular compound. ____ 69. Whic ...
ws-8-14-2
... Answers : 6. k= 8.3 x 10-4 s-1, [H2O2] = 0.037 M at 4000. s 7. k = 6.90 x 10-2 s-1 7b. t1/2 = 10.0 s 7c. 3 halflives = 30.0 s 8. k = 2.08 x 10-4 L/mol·s ; [NO2] at 2.70 X 104 s = 0.131 M 9a. k = 4.15 x 10-3 L/mol·s 9b. t1/2 = 2.41 x 103 s 9c. t = 7.23 x 103 s 10a. slope = -1.20 x 10-4 L/mol·s 10b. 0 ...
... Answers : 6. k= 8.3 x 10-4 s-1, [H2O2] = 0.037 M at 4000. s 7. k = 6.90 x 10-2 s-1 7b. t1/2 = 10.0 s 7c. 3 halflives = 30.0 s 8. k = 2.08 x 10-4 L/mol·s ; [NO2] at 2.70 X 104 s = 0.131 M 9a. k = 4.15 x 10-3 L/mol·s 9b. t1/2 = 2.41 x 103 s 9c. t = 7.23 x 103 s 10a. slope = -1.20 x 10-4 L/mol·s 10b. 0 ...
Answers to examination questions
... Fluorine is non-polar: the two fluorine atoms have equal electronegativity values. Tetrafluoromethane is tetrahedral and hence non-polar. Hydrogen iodide and hydrogen fluoride are both polar owing to the presence of a polar bond and linear shape. However, fluorine is the most electronegative element ...
... Fluorine is non-polar: the two fluorine atoms have equal electronegativity values. Tetrafluoromethane is tetrahedral and hence non-polar. Hydrogen iodide and hydrogen fluoride are both polar owing to the presence of a polar bond and linear shape. However, fluorine is the most electronegative element ...
Chapter 3
... That is “Calculation of quantities in chemical reactions” Stoichiometry - The study of quantities of materials consumed and produced in chemical reactions. ...
... That is “Calculation of quantities in chemical reactions” Stoichiometry - The study of quantities of materials consumed and produced in chemical reactions. ...