positive or negative charge Anion- negatively charged ion Cation- positively charged ion Molecules- small‚ electrically neutral “units”; maintain the properties of that substance Formula unit- the lowest whole number ratio of ions in an ionic compound Products are on the right side of the yield sign Reactants are on the left side of the yield sign Coefficients are the whole numbers that we place in front of a substance to balance an equation. We correctly write the Nobel gases (such
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a special chemical compound—called CHEMIX—that is used extensively in high school chemistry classes. This compound must contain at least 20% sulfur‚ at least 30% iron oxide‚ and at least 30% but no more than 45% potassium. Tarmac’s marketing department has estimated that it will need at least 600 pounds of this compound to meet the expected demand during the coming school session. Tarmac can buy three compounds to mix together to produce CHEMIX. The makeup of these compounds is shown in the following
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00945 mole) Mass sodium borohydride = 0.4059g (0.0107 mole) Mass compound A used to form compound B = 1.0647g Results Mass (g) moles Molecular formula Yield (%) Mp (pure) Compound A 1.7458 0.00815 C14H14O2 86.22 138-139 Compound C 0.4255 0.001988 C14H14O2 40.02 136-138 Spectral Analysis IR Absorption (cm-1) Assignment Benzoin 3411‚ 3374 OH 2961‚ 2903 C-H aromatic 2358 C-O 1678 Ketone Compound A 3372 OH stretch 3310 OH stretch 3085‚ 3060‚ 3030 C-H
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non-metal to achieve a complete octet. The gain of negatively charged electrons by a neutral atom produces an anion. 7.2- Ionic Bonds and Ionic Compounds Although they are composed of ions‚ ionic compounds are electrically neutral. Most ionic compounds are crystalline solids at room temperature. Ionic compounds generally have high melting points. Ionic compounds can conduct an electric current when melted or dissolved in water. 7.3-Bonding in Metals The valence electrons of metal atoms can be modeled
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decomposition of gold oxide * 2. Light decomposition (photolysis) of silver bromide * 3. Electrolytic decomposition of molten lead (II) bromide * Synthesis reaction is the formation of a compound from its elements or a more complex compound from simpler compounds. * Application of decomposition reaction in the real world: * Rust is an oxide of iron that forms when iron structures are exposed to oxygen in the air. * The ammonia industry synthesises
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question. 1. Which type of compound usually has higher melting points‚ ionic compounds or covalent compounds? What is the reason for this difference in melting points? (3 points) 2. Do ionic compounds conduct electricity as: (3 points) a. Solids? b. Liquids? c. Aqueous solutions (when the ionic compounds are dissolved in water)? 3. Do covalent compounds conduct electricity as: (3 points) a. Solids? b. Liquids? c. Aqueous solutions (when the covalent compounds are dissolved in water)
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Periodic Table: * Mass Number = protons + neutrons in the nucleus * Atomic Number = number of protons in the nucleus * Number of neutrons = mass number – atomic number Example: Lithium (Li) * # of protons + # of neutrons = mass # * 3 + 4 = 6.9/ 7 * The atomic mass is the mean of all the isotopes of Lithium in nature; round the number * Isotopes of a specific element have a varying number of neutrons * The number
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and ionic radius. Intermolecular forces had sparked interest in me from the very day it was begun to be taught. I have chosen all nitrate salts only as I wanted to compare my temperature results with the ionic radius of the metallic element in the compounds. Background information: As previously taught‚ I know that the temperature of solubility of a salt will be higher if the molar mass of a substance is higher‚ as it will have more number of grams per mole‚ hence more amount of thermal energy will
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Melting point 1. What two effects do impurities have on the melting point of an organic compound? Soluble impurities affect the melting point of a solid in the following manner. a. The presence of an impurity in the molten compound reduces its vapor pressure thus lowering the melting point of the compound. b. Broaden the melting point range. 2. For what tow purpose are melting points routinely used a. To determine the identity of an organic solid. b. To determine the purity of an organic solid
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Recrystallization is a process of purifying organic compounds obtained from nature that contain soluble‚ insoluble and colored impurities. This is based on the premise that solubility increases on the increase of temperature while solubility decreases on the decrease of temperature. This is the process behind the formation of crystals. Recrystallization can be broken down into several steps. A suitable solvent is chosen followed by the compound being dissolved in a minimum solvent. Insoluble impurities
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