molar mass = 342.34 g/mol 60.5g x 1 mol x 6.02 x 1023 molecules x 12 atoms C = 1.28 x 1024 atoms 342.34 g 1 mol 1 molecules If 3.75 x 1024 atoms of hydrogen are found in a sample of ammonium chloride‚ what mass of ammonium chloride is present? NH4Cl M= 53.50 g/mol 3.75 x 1024 atoms H x 1 molecule x 1 mol x 53.50 g = 83.3g 4 atoms H 6.02 x 1023 molec
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Self-assessment practice tests Test 1 – Material from Chapters 2–4 | 45 minutes 1 The kinetic theory suggests different arrangements for the atoms or molecules in the three states of matter. The diagrams below show how evidence suggests the particles are arranged in the three states of matter. 1 2 3 What are the three states shown? 1 A B C D 2 gas liquid solid liquid 2 liquid gas liquid solid 3 solid solid gas gas The graph shows the heating curve for a metal that is solid at room temperature (25
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found in each of the large biomolecules (carbohydrates‚ proteins‚ lipids‚ nucleic acids). The SPONCH elements are Sulfur‚ Phosphorus‚ Oxygen‚ Nitrogen‚ Carbon and Hydrogen. These are the five key elements that compose living things. The four most frequently occurring of the SPONCH elements are‚ carbon‚ hydrogen‚ nitrogen and oxygen. Carbon is found in each of the large biomolecules. 2. Outline the difference between an atom and an ion. An atom has the same amount of
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Name *Density @ STP Melting Point (°C) Boiling Point (°C) Chlorine Hydrogen Hydrogen chloride Hydrogen sulfide Nitrogen Nitrogen monoxide 3.21 g/L 0.0899 g/L 1.640 g/L 1.54 g/L 1.25 g/L 1.34 g/L 1.43 g/L 2.532 g/cm 3 2.165 g/cm 3 2.92 g/L 1.00 g/cm 3 −101 −35 −259 −115 −85 −253 −85 −61 −210 −164 −218 851 801 −73 −196 −152 −183 Decomposes 1413 −10 100 Oxygen Sodium carbonate Sodium chloride Sulfur dioxide *Water (at 4°C) 0 NCDPI Reference Tables for Chemistry
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AB ? A + B The electrolysis of water into oxygen and hydrogen gas is an example of a decomposition reaction: 2 H2O ? 2 H2 + O2 Single Displacement or Substitution Reaction A substitution or single displacement reaction is characterized by one element being displaced from a compound by another element. A + BC ? AC + B An example of a substitution reaction occurs when zinc combines with hydrochloric acid. The zinc replaces the hydrogen: Zn + 2 HCl ? ZnCl2 + H2 Metathesis or Double Displacement
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ELECTROLYSIS Electrolysis decomposition of compound using electricity Electrolyte an ionic compound which conducts electric current in molten or aqueous solution‚ being decomposed in the process. Electrode a rod or plate where electricity enters or leaves electrolyte during electrolysis. Reactions occur at electrodes. Discharge the removal of electrons from negative ions to form atoms or the gain of electrons of positive ions to become atoms. Anode
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atoms in 3.08g of tetrachloromethane (CCl4) b. The number of moles of fluorine atoms in 204 g of boron trifluoride BF3; c. The number of moles of chloride in 5.55 g of calcium chloride‚ CaCl 2 d. The number of moles of sulphate ions in 144g of magnesium sulphate 3 e. The number of molecules in 1000 cm of barium nitrate 5. 100 cm3 of hydrogen chloride gas was mixed with a metallic compound producing a very volatile & explosive reaction. What is the mass of this gas at RTP? Chemist ry 6.
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electrons? +2 3) What is the charge on an ion formed when an atom gains two electrons? -2 The Mole 1) Find the molar mass of zinc 65g/mol 2)Find the molar mass of sulfuric acid H2 SO4 98g/mol 3) How many moles of sodium chloride are present in 117g of Na2 CI 2 moles 4) I have 54g of water (H2O) and 84 g of iron (Fe) do I have more moles of water or of iron I have more miles of water (54 g = 3 moles H20 ‚ 84g = 1.5 moles Fe) Arrangement of Electrons 1)
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at pH = 7 would be: A. +2 B. +1 C. 0 D. -1 E. -2 5. The sequence of monomers in any polymer is this type of structure: A. primary structure B. secondary structure C. tertiary structure D. quaternary structure E. All of these 6. Hydrogen bonds are most important in this type of structure in proteins: A. primary structure B. secondary structure C. tertiary structure D. quaternary structure E. All of these 7. The overall folding of a single protein subunit is called: A
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compound. In this lab‚ we will react a known quantity of magnesium metal to form chloride product. We then mass the final product and subtract to find the mass of chlorine in the product. Once we know the masses of elements in the compounds‚ we can convert to moles and determine the simplest whole number mole ratio. Objective The objective of this lab is to determine the empirical formula of magnesium chloride. Methodology 1. Measure the mass of an evaporating dish with its watch glass lid
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