The Preparation of an Explosive: Nitrogen
... One mole of N2 is created at 944 kJ mol-1 and 3 I-I at 151 kJ mol-1 producing 1397 KJ mol-1. The change in energy is equal to the enthalphy of the reactants deducting the enthalphy of the products, giving the highly exothermic reaction (Fig. 3) and overall energy change of -437 kJ mol-1. 5 Results a ...
... One mole of N2 is created at 944 kJ mol-1 and 3 I-I at 151 kJ mol-1 producing 1397 KJ mol-1. The change in energy is equal to the enthalphy of the reactants deducting the enthalphy of the products, giving the highly exothermic reaction (Fig. 3) and overall energy change of -437 kJ mol-1. 5 Results a ...
Aqueous chemistry is a very important component to laboratory
... In an acid-base titration, an indicator is used to show the change from an acidic situation (all acid), and as the base is slowly added and neutralization occurs, the color shift will be towards the basic side. When the moles of acid = moles of base neutralization is said to occur. We note this by t ...
... In an acid-base titration, an indicator is used to show the change from an acidic situation (all acid), and as the base is slowly added and neutralization occurs, the color shift will be towards the basic side. When the moles of acid = moles of base neutralization is said to occur. We note this by t ...
Quantitative Analysis of the Electrostatic
... established;8-11 however, only the deformation electron densities12-16 and electrostatic potentials17 for some simple molecules have been obtained up to now using gas-phase electron diffraction. The electrostatic potential in solids was studied by electron diffraction as well;18,19 however, the accu ...
... established;8-11 however, only the deformation electron densities12-16 and electrostatic potentials17 for some simple molecules have been obtained up to now using gas-phase electron diffraction. The electrostatic potential in solids was studied by electron diffraction as well;18,19 however, the accu ...
O usually has oxidation number of -2, except in peroxides where it is
... The sum of the oxidation numbers of the elements in a polyatomic ion must equal the ion charge. Consider these examples. If there are two poly atomic ions in a compound deal with them first. e.g. Carbonate ion, . O has oxidation number of -2. There are 3O’s in the formula so the total negative charg ...
... The sum of the oxidation numbers of the elements in a polyatomic ion must equal the ion charge. Consider these examples. If there are two poly atomic ions in a compound deal with them first. e.g. Carbonate ion, . O has oxidation number of -2. There are 3O’s in the formula so the total negative charg ...
Science Focus 9 Matter and Chemical Change Class Notes Topic 1
... identified by measuring a property of the substance (eg. density) and compare it to known values of other substances. If the test property matches a known value, it is likely that substance, because each substance has its own distinguishing properties unique to that substance. ...
... identified by measuring a property of the substance (eg. density) and compare it to known values of other substances. If the test property matches a known value, it is likely that substance, because each substance has its own distinguishing properties unique to that substance. ...
Bright source of cold ions for surface-electrode traps
... above it 关10兴. Such surface traps allow good optical access to the ions and can be fabricated using simpler lithographic techniques than three-dimensional traps 关11–13兴. While the prospect of scalable quantum computing has been the main motivation for developing surface-electrode traps, it is likely ...
... above it 关10兴. Such surface traps allow good optical access to the ions and can be fabricated using simpler lithographic techniques than three-dimensional traps 关11–13兴. While the prospect of scalable quantum computing has been the main motivation for developing surface-electrode traps, it is likely ...
"Supramolecular chemistry is the chemistry of the intermolecular
... Comparable in strength to covalent bonding -> is it really a weak interaction? Examples ...
... Comparable in strength to covalent bonding -> is it really a weak interaction? Examples ...
Calculating Formula Mass
... • Measuring the number of atoms involved in a chemical reaction is impractical. • The mole establishes a relationship between the number of particles involved in a reaction and the mass of that reactant or product. ...
... • Measuring the number of atoms involved in a chemical reaction is impractical. • The mole establishes a relationship between the number of particles involved in a reaction and the mass of that reactant or product. ...
Chemistry Revision Checklist F4 2017 (inc F3)
... Describe the concept of homologous series as a ‘family’ of similar compounds with similar chemical properties due to the presence of the same functional group Describe the general characteristics of an homologous series Recall that the compounds in a homologous series have the same general formula D ...
... Describe the concept of homologous series as a ‘family’ of similar compounds with similar chemical properties due to the presence of the same functional group Describe the general characteristics of an homologous series Recall that the compounds in a homologous series have the same general formula D ...
English Medium
... A. The physical and chemical properties of elements are a periodic function of their atomic weights. 2. What is valency? A. Valency of an element was defined as the combining power of an element with respect to hydrogen. 3. Write the units of ionization energy? A. ev (or) Kcal / mole (or) KJ/mole 4. ...
... A. The physical and chemical properties of elements are a periodic function of their atomic weights. 2. What is valency? A. Valency of an element was defined as the combining power of an element with respect to hydrogen. 3. Write the units of ionization energy? A. ev (or) Kcal / mole (or) KJ/mole 4. ...
Part II - American Chemical Society
... 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, and it requires a great deal of energy to break an SiO2 unit away from the rest of the solid. Ultimately the key bonding feature ...
... 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, and it requires a great deal of energy to break an SiO2 unit away from the rest of the solid. Ultimately the key bonding feature ...
regents chemistry midterm - irondequoit 2014_entire exam w key
... Midterm Test 17. An element that is malleable and a good conductor of heat and electricity could have an atomic number of ...
... Midterm Test 17. An element that is malleable and a good conductor of heat and electricity could have an atomic number of ...
Chapter 28 Atomic Physics
... The Bohr model served well as a first approximation for a single electron atom. Bohr himself supported his model as only the first step toward a comprehensive quantum theory. In spite of refinements (such as elliptical orbits), the Bohr model could not account for some of the fine structure, and lin ...
... The Bohr model served well as a first approximation for a single electron atom. Bohr himself supported his model as only the first step toward a comprehensive quantum theory. In spite of refinements (such as elliptical orbits), the Bohr model could not account for some of the fine structure, and lin ...
PHYSICAL SETTING CHEMISTRY
... At standard pressure, water has unusual properties that are due to both its molecular structure and intermolecular forces. For example, although most liquids contract when they freeze, water expands, making ice less dense than liquid water. Water has a much higher boiling point than most other molec ...
... At standard pressure, water has unusual properties that are due to both its molecular structure and intermolecular forces. For example, although most liquids contract when they freeze, water expands, making ice less dense than liquid water. Water has a much higher boiling point than most other molec ...
Chap 9 Redox Review Q`s
... (ii) State the products formed and give equations showing the reactions at each electrode. ...
... (ii) State the products formed and give equations showing the reactions at each electrode. ...
THE INSTRUMENTALISM-REALISM DEBATE: A CASE FOR A
... may argue that Mendel's "gene" and the "gene" of contemporary biology do not refer to the same entities. However, one is still,quite free to claim that some terms of old theories have no reference whatever, as in the case of phlogiston. This point may he elaborated on if we consider, for example, Pu ...
... may argue that Mendel's "gene" and the "gene" of contemporary biology do not refer to the same entities. However, one is still,quite free to claim that some terms of old theories have no reference whatever, as in the case of phlogiston. This point may he elaborated on if we consider, for example, Pu ...
Harrisburg Area Community College 2013/2014
... careful; the assumption that I should get a better value from the balance implies a whole bunch of other factors (such as calibrating the balance and using the balance correctly. Two general terms used to discuss the “goodness” of data are accuracy and precision. Accuracy describes how closely a mea ...
... careful; the assumption that I should get a better value from the balance implies a whole bunch of other factors (such as calibrating the balance and using the balance correctly. Two general terms used to discuss the “goodness” of data are accuracy and precision. Accuracy describes how closely a mea ...
Molecular Term Symbols
... Fluorescence is a radiative transition from the lowest vibrational state of excited states back to the ground state. Consider the following figure: The fluorescence process involves: • Absorption from the lowest vibrational level of the ground state to the various vibrational levels of the excited ( ...
... Fluorescence is a radiative transition from the lowest vibrational state of excited states back to the ground state. Consider the following figure: The fluorescence process involves: • Absorption from the lowest vibrational level of the ground state to the various vibrational levels of the excited ( ...
Ch 8 Lecture Notes
... groundwater, a chemist adds a large enough volume of a solution of AgNO 3 to precipitate all the Cl- ions as silver chloride. The mass of the resulting precipitate is 71.7 mg. What is the Cl- concentration in the sample in mg/L? AgNO3(aq) + Cl-(aq) ...
... groundwater, a chemist adds a large enough volume of a solution of AgNO 3 to precipitate all the Cl- ions as silver chloride. The mass of the resulting precipitate is 71.7 mg. What is the Cl- concentration in the sample in mg/L? AgNO3(aq) + Cl-(aq) ...
Chemical bond
A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electrostatic force of attraction between opposite charges, either between electrons and nuclei, or as the result of a dipole attraction. The strength of chemical bonds varies considerably; there are ""strong bonds"" such as covalent or ionic bonds and ""weak bonds"" such as Dipole-dipole interaction, the London dispersion force and hydrogen bonding.Since opposite charges attract via a simple electromagnetic force, the negatively charged electrons that are orbiting the nucleus and the positively charged protons in the nucleus attract each other. An electron positioned between two nuclei will be attracted to both of them, and the nuclei will be attracted toward electrons in this position. This attraction constitutes the chemical bond. Due to the matter wave nature of electrons and their smaller mass, they must occupy a much larger amount of volume compared with the nuclei, and this volume occupied by the electrons keeps the atomic nuclei relatively far apart, as compared with the size of the nuclei themselves. This phenomenon limits the distance between nuclei and atoms in a bond.In general, strong chemical bonding is associated with the sharing or transfer of electrons between the participating atoms. The atoms in molecules, crystals, metals and diatomic gases—indeed most of the physical environment around us—are held together by chemical bonds, which dictate the structure and the bulk properties of matter.All bonds can be explained by quantum theory, but, in practice, simplification rules allow chemists to predict the strength, directionality, and polarity of bonds. The octet rule and VSEPR theory are two examples. More sophisticated theories are valence bond theory which includes orbital hybridization and resonance, and the linear combination of atomic orbitals molecular orbital method which includes ligand field theory. Electrostatics are used to describe bond polarities and the effects they have on chemical substances.