1. Which of the following polyatomic ions have a 3-ionic charge? a. Phosphate b. Hydrogen carbonate c. Sulfate d. Hydroxide e. Nitrate 2. In which of the following is the metric unit paired with its correct abbreviation? a. Centimeter/km b. Kilogram/cg c. Millimeter/mL d. Microgram/mg e. Gram/gm 3. The number of electrons in an ion with 20 protons and an ionic charge of 2- is? a. 22 b. 18 c. 20 d. 16 e. 24 4. Which of the following is a measurement of mass in the metric system
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There is no reason to destroy our environment or humanity if we can find a way around it. NaCl may be soluble in water‚ and may not chemically attack concrete‚ but the sodium ion in NaCl is toxic to vegetation‚ as well as the water supply. When NaCl decomposes at/around 20°C‚ the toxic sodium ion threatens our environment. Sodium can vigorously react with water‚ which can lead to death of our animals in the environment. After ice storms‚ NaCl can be found on many cars and sides of the
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than red light Flame tests are used to identify the presence of a relatively small number of metal ions in a compound. Not all metal ions give flame colours. For Group 1 compounds‚ flame tests are usually by far the easiest way of identifying which metal you have got. Flame colours are produced from the movement of the electrons in the metal ions present in the compounds. For example‚ a sodium ion in an unexcited state has the structure 1s22s22p6. When you heat it‚ the electrons gain energy and
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HKDSE Chemistry – A Modern View 1 (SAMPLE) Suggested Answers (Coursebook) |Chapter 1 The fundamentals of chemistry | |Class Practice |1 | |Chapter Exercises |3 | |Chapter 2 The atmosphere
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Organic chemistry is used EVERYWHERE. For example methane‚ which is a gas produced by flatulence‚ that gas is also found in marshes. An acid is a compound that produces hydrogen ions when dissolved in water. Therefore‚ the chemical formulas of acids are of the general form HX‚ where X is a monatomic or polyatomic ion. When the name of the anion ends in ide‚ the acid name begins with the prefix hydro-. The stem of the anion has the suffix ic and is followed by the word acid. Therefore‚ HCL is
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formulas for the following: calcium nitrate phosphorous pentafluoride aluminum carbonate strontium hydroxide methane potassium oxide lithium chloride barium sulfate phosphate ion dinitrogen tetroxide Give the complete electron configurations of: S‚ O2-‚ and Mn. For the following molecules/ions‚ give the Lewis structure‚ molecular geometry‚ and electron pair geometry: NO2- SF4 Write Lewis structures to represent all resonance forms of CO32-. 5. How many joules of heat
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[pic] Contents |PART I PLANET EARTH | |Chapter 1 Fundamentals of chemistry | | |The scientific method |1 | |Kinetic theory of matter
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degrees PCl4+ P Zero 4 Tetrahedral 109 degrees NO3- N Zero 3 Trigonal Planar 120 degrees O3 O One 2 Linear Bent 120 degrees Based on their molecular geometries‚ which of the molecules (not including the polyatomic ions) are polar? (3 points) NH3‚ HCN‚ H2O‚ SO2 are all polar. Which of the molecules would experience hydrogen-bonding forces of attraction? (2 points) H2O‚ NH3‚ and HCN all experience hydrogen-bonding forces of attraction. Which of the molecules
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How do ionic bonds form? Transferring the electron forms an ionic bond. After transferring the electron‚ the two atoms become ion n will attract together because they have the opposite charges. Then an ionic bond is formed. How do covalent bonds form? A covalent bond is for sharing of electrons. I remember it like co-existing electrons to share (Eg H20). It is usually between two non-metals. Which compound‚ sugar or salt‚ is a better conductor of electricity? Explain your answer. Salt
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VCE Chemistry Week 1 - Chemical Analysis (1) Horizen Education February 8‚ 2013 1 1.1 Review: Gravimetric and Volumetric Analysis Gravimetric Analysis Solubilities Always soluble: Usually soluble: Exceptions: Na+ ‚ K+ ‚ NO3− ‚ CH3 COO− ‚ NH+ 4 Cl− ‚ I− ‚ Br− i. Sodium carbonate and Silver nitrate ii. Iron (II) sulfate and Lead (II) nitrate iii. Sodium nitrate and Nickel sulfate iv. Potassium hydroxide and Copper (II) nitrate v. Sodium sul de and Cadmium sulfate Ho
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