study packet for chapter 5
... A) K/J or °C/J B) J/K or J/°C C) J/g-K or J/g-°C D) J/mol E) g-K/J or g-°C/J 23) The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1 °F. There are ________ Btu in one Joule. 1 lb = ...
... A) K/J or °C/J B) J/K or J/°C C) J/g-K or J/g-°C D) J/mol E) g-K/J or g-°C/J 23) The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1 °F. There are ________ Btu in one Joule. 1 lb = ...
Chapter 5: thermochemstry
... More on hess’ law • Hess' law allows ΔH rxn to be calculated even when it can’t be measured directly. • To do this, we perform arithmetic operations on chemical equations and known ΔH values. – Chemical equations may be multiplied or divided by a whole number. – When an equation is multiplied by a c ...
... More on hess’ law • Hess' law allows ΔH rxn to be calculated even when it can’t be measured directly. • To do this, we perform arithmetic operations on chemical equations and known ΔH values. – Chemical equations may be multiplied or divided by a whole number. – When an equation is multiplied by a c ...
Chapter 17 Thermodynamics: Directionality of Chemical Reactions
... Calculate ΔS when 25.0 g of Al(s) melts at its normal melting point (660.3 °C; 1 atm). ΔH°fus(Al)=10.7 kJ mol-1 ...
... Calculate ΔS when 25.0 g of Al(s) melts at its normal melting point (660.3 °C; 1 atm). ΔH°fus(Al)=10.7 kJ mol-1 ...
Chemistry - Bourbon County Schools
... hybridization models relate to molecular geometry Describe the molecular orbital models for double bonds, triple bonds, and ...
... hybridization models relate to molecular geometry Describe the molecular orbital models for double bonds, triple bonds, and ...
MULTIPLE CHOICE
... E) NH4 Cl 43) Of the choices below, which would be the best for the lining of a tank intended for use in storage of hydrochloric acid? (least reactive) A) copper B) zinc C) nickel D) iron E) tin 44) One method for removal of metal ions from a solution is to convert the metal to its elemental form so ...
... E) NH4 Cl 43) Of the choices below, which would be the best for the lining of a tank intended for use in storage of hydrochloric acid? (least reactive) A) copper B) zinc C) nickel D) iron E) tin 44) One method for removal of metal ions from a solution is to convert the metal to its elemental form so ...
2202 Chapter 1 - Eric G. Lambert School
... - water mixed in with the ions - heating removes the water to make an anhydrous (dry) compound - use prefixes to indicate ratio of water to ions eg. CuSO4• 5 H2O copper (II) sulfate pentahydrate lithium chloride dihydrate 8:12 PM ...
... - water mixed in with the ions - heating removes the water to make an anhydrous (dry) compound - use prefixes to indicate ratio of water to ions eg. CuSO4• 5 H2O copper (II) sulfate pentahydrate lithium chloride dihydrate 8:12 PM ...
chapter 2
... a. Alkali Metals – most reactive metals, react violently with water b. Alkaline Earth Metals – reactive metals but less so than alkali c. Halogens – most reactive non-metals, most are poisonous gases d. Noble Gases – do not react 3. If a noble gas could form a +1 ion, which of the noble gases would ...
... a. Alkali Metals – most reactive metals, react violently with water b. Alkaline Earth Metals – reactive metals but less so than alkali c. Halogens – most reactive non-metals, most are poisonous gases d. Noble Gases – do not react 3. If a noble gas could form a +1 ion, which of the noble gases would ...
Vocabulary CHEM121
... compound is neutral (the positive and negative charges must add up to zero). The symbol for the metal is listed first and subscripts are used to indicate the number of ions (if more than 1). The name is that of the metal followed by that of the non-metal with the “-ide” ending to indicate the homonu ...
... compound is neutral (the positive and negative charges must add up to zero). The symbol for the metal is listed first and subscripts are used to indicate the number of ions (if more than 1). The name is that of the metal followed by that of the non-metal with the “-ide” ending to indicate the homonu ...
Unit 8 Note Packet
... 2. Balance a chemical equation based upon the law of conservation of matter. 3. Analyze or draw a graph for the energy change of a chemical reaction. 4. Calculate the heat of solution for a given compound. We are looking for: 1a. Given the word equation/sentence, translate it into a formula chemical ...
... 2. Balance a chemical equation based upon the law of conservation of matter. 3. Analyze or draw a graph for the energy change of a chemical reaction. 4. Calculate the heat of solution for a given compound. We are looking for: 1a. Given the word equation/sentence, translate it into a formula chemical ...
ch19 MSJ jlm
... The Ag|Ag+ half-cell has a higher reduction potential than the Cu|Cu2+ half-cell. This means that the Ag/Ag+ half-cell will more readily undergo reduction when compared to the Cu/Cu2+ halfcell, and the Cu|Cu2+ half-cell will undergo oxidation. The Ag|Ag+ standard reduction potential is Eored = +0.8 ...
... The Ag|Ag+ half-cell has a higher reduction potential than the Cu|Cu2+ half-cell. This means that the Ag/Ag+ half-cell will more readily undergo reduction when compared to the Cu/Cu2+ halfcell, and the Cu|Cu2+ half-cell will undergo oxidation. The Ag|Ag+ standard reduction potential is Eored = +0.8 ...
Enzymes: “Helper” Protein molecules
... Has a structure similar to substrate Occupies active site Competes with substrate for active site Has effect reversed by increasing substrate concentration ...
... Has a structure similar to substrate Occupies active site Competes with substrate for active site Has effect reversed by increasing substrate concentration ...
Exames anteriores a 1994
... E is a solid which is stable for weeks at 0°C, but decomposes in days at room temperature. The electron density distribution of E obtained through X-ray diffraction studies is shown on two intersecting, mutually perpendicular planes (see Fig. 2). The numbers indicated on the maps relate to the elect ...
... E is a solid which is stable for weeks at 0°C, but decomposes in days at room temperature. The electron density distribution of E obtained through X-ray diffraction studies is shown on two intersecting, mutually perpendicular planes (see Fig. 2). The numbers indicated on the maps relate to the elect ...
Basic chemistry - Ross University
... vessel, rather than an open test tube, the evaporating product C will cause an increase in pressure. Under these conditions, Keq will be more on the side of the educts, rather than the products. By artificially increasing the pressure further we can shift the equilibrium even more to the educts, by ...
... vessel, rather than an open test tube, the evaporating product C will cause an increase in pressure. Under these conditions, Keq will be more on the side of the educts, rather than the products. By artificially increasing the pressure further we can shift the equilibrium even more to the educts, by ...
IGCSE SoW 2013
... Recall the properties of carbon dioxide, limited to its solubility and density ...
... Recall the properties of carbon dioxide, limited to its solubility and density ...
Acids-bases and Organic Review
... structural formula for a molecule of 2,2,4-trimethylpentane. [1] ...
... structural formula for a molecule of 2,2,4-trimethylpentane. [1] ...
ATOMS, MOLECULES, AND IONS
... kg. Later experiments by Rutherford determined that at the center of an atom is a positively charged, compact, heavy nucleus. The charge on the atomic nucleus is +Ze (Z is the atomic number of the atom). The fundamental unit of positive charge in the nucleus is the proton. ♦ Chemical identity of an ...
... kg. Later experiments by Rutherford determined that at the center of an atom is a positively charged, compact, heavy nucleus. The charge on the atomic nucleus is +Ze (Z is the atomic number of the atom). The fundamental unit of positive charge in the nucleus is the proton. ♦ Chemical identity of an ...
half-reactions - Clayton State University
... BALANCING REDOX EQUATIONS - Write separate oxidation and reduction half-reactions - Balance all the elements except hydrogen and oxygen in each - Balance oxygen using H2O(l), hydrogen using H+(aq), and charge using electrons (e-) ...
... BALANCING REDOX EQUATIONS - Write separate oxidation and reduction half-reactions - Balance all the elements except hydrogen and oxygen in each - Balance oxygen using H2O(l), hydrogen using H+(aq), and charge using electrons (e-) ...
Chapter 4 Aqueous Reactions and Solution Stoichiometry
... oxidation numbers, although some are positive in certain compounds or ions. Fluorine always has an oxidation number of −1. The other halogens have an oxidation number of −1 when they are negative; they can have positive oxidation numbers, Aqueous however, most notably in oxyanions. Reactions ...
... oxidation numbers, although some are positive in certain compounds or ions. Fluorine always has an oxidation number of −1. The other halogens have an oxidation number of −1 when they are negative; they can have positive oxidation numbers, Aqueous however, most notably in oxyanions. Reactions ...
Thermo notes Part II
... Ex. 6) Find the ∆Grxn for liquid ethanol, C2H5OH, undergoing combustion: • C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g) • Is this reaction spontaneous or nonspontaneous? ...
... Ex. 6) Find the ∆Grxn for liquid ethanol, C2H5OH, undergoing combustion: • C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g) • Is this reaction spontaneous or nonspontaneous? ...
LN_atoms_etc
... Modern View of Atomic Structure Experiments by Thomson and Millikan confirmed the existence of electrons as the negatively charged particles within an atom. Electrons have a charge of e = 1.6021773 10–19 C and a mass of 9.109390 10–31 kg. Later experiments by Rutherford determined that at the ce ...
... Modern View of Atomic Structure Experiments by Thomson and Millikan confirmed the existence of electrons as the negatively charged particles within an atom. Electrons have a charge of e = 1.6021773 10–19 C and a mass of 9.109390 10–31 kg. Later experiments by Rutherford determined that at the ce ...
Part II - American Chemical Society
... a) Carbon dioxide is small, non-polar molecule. The intermolecular forces between them are small, so CO2 is a gas. Conversely, silicon dioxide is a network solid. As a network, the connections are covalent bonds, which are quite strong compared to the intermolecular forces between small molecules, a ...
... a) Carbon dioxide is small, non-polar molecule. The intermolecular forces between them are small, so CO2 is a gas. Conversely, silicon dioxide is a network solid. As a network, the connections are covalent bonds, which are quite strong compared to the intermolecular forces between small molecules, a ...
Document
... H2(g) + O2(g) H2O(g) What do we do to avoid violating the law of conservation of matter? (As written we’ve lost ...
... H2(g) + O2(g) H2O(g) What do we do to avoid violating the law of conservation of matter? (As written we’ve lost ...
Lewis acid catalysis
In Lewis acid catalysis of organic reactions, a metal-based Lewis acid acts as an electron pair acceptor to increase the reactivity of a substrate. Common Lewis acid catalysts are based on main group metals such as aluminum, boron, silicon, and tin, as well as many early (titanium, zirconium) and late (iron, copper, zinc) d-block metals. The metal atom forms an adduct with a lone-pair bearing electronegative atom in the substrate, such as oxygen (both sp2 or sp3), nitrogen, sulfur, and halogens. The complexation has partial charge-transfer character and makes the lone-pair donor effectively more electronegative, activating the substrate toward nucleophilic attack, heterolytic bond cleavage, or cycloaddition with 1,3-dienes and 1,3-dipoles.Many classical reactions involving carbon–carbon or carbon–heteroatom bond formation can be catalyzed by Lewis acids. Examples include the Friedel-Crafts reaction, the aldol reaction, and various pericyclic processes that proceed slowly at room temperature, such as the Diels-Alder reaction and the ene reaction. In addition to accelerating the reactions, Lewis acid catalysts are able to impose regioselectivity and stereoselectivity in many cases.Early developments in Lewis acid reagents focused on easily available compounds such as TiCl4, BF3, SnCl4, and AlCl3. The relative strengths of these (and other) Lewis acids may be estimated from NMR spectroscopy by the Childs method or the Gutmann-Beckett method. Over the years, versatile catalysts bearing ligands designed for specific applications have facilitated improvement in both reactivity and selectivity of Lewis acid-catalyzed reactions. More recently, Lewis acid catalysts with chiral ligands have become an important class of tools for asymmetric catalysis.Challenges in the development of Lewis acid catalysis include inefficient catalyst turnover (caused by catalyst affinity for the product) and the frequent requirement of two-point binding for stereoselectivity, which often necessitates the use of auxiliary groups.