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Semester I Review

Semester I Review. ANSWERS. Semester I Review. How many sig-figs are found in each number? 0.345 3 3005 4 300 1 3.002 4 0.00023 2. Semester I Review. Round each number to three sig-figs. 45678 45700 0.002894 0.00289 23.76 23.8 100.5 100 . 56.799 56.8.

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Semester I Review

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  1. Semester I Review ANSWERS

  2. Semester I Review • How many sig-figs are found in each number? • 0.345 3 • 3005 4 • 300 1 • 3.002 4 • 0.00023 2

  3. Semester I Review • Round each number to three sig-figs. • 45678 45700 • 0.002894 0.00289 • 23.76 23.8 • 100.5 100. • 56.799 56.8

  4. Semester I Review • Which of the following is a mixture. • Pure water compound • Clean air homogenous mixture • Iron (II) oxide compound • Salt water homogenous mixture • Carbon dioxide compound

  5. Semester I Review • Which of the following is a chemical change. • Cutting paper physical • Boiling water physical • Rusting iron chemical • Burning gasoline chemical

  6. Complete the table using the given numbers

  7. Semester I Review • Calculate the average atomic mass given the following data: element Y has three isotopes 35.0% = 23.5 amu, 55.0% = 25.0 amu and 10.0% = 26.0 amu. • (35x23.5) + (55x25.0) + (10x26.0) = 24.6 100

  8. Semester I Review • 25.0 grams of a given metal displaces 44.2 mL of water; what is the density of the metal? • 25.0g/44.2mL = 0.566g/mL

  9. Semester I Review • What did each scientist contribute to the development of the modern atom. • Dalton = proof of the atom • Thomson = cathode rays are electrons • Rutherford = dense positive nucleus, electrons outside nucleus, atom mostly empty space • Milliken = mass to charge ratio of the electron

  10. Determine if the data below is accurate, precise, both, or neither Calculate the percent error using the average of the measurements. (34.60 – 34.50) x100 = 0.2899% 34.50

  11. Semester I Review • The splitting of a nucleus is known as ___fission _____. • The combining of two small nuclei to form a larger one is known as ____Fusion______. • Give the formula of an alpha particle and beta particle.

  12. Semester I Review • Decay of polonium-218 by alpha () emission. •  + • Decay of carbon – 14 by beta emission •  + • Decay of Thorium - 232 by an electron capture • + 

  13. Semester I Review • The half-life of phosphorous-30 is 2.5 min. If you start with 55 g of phosphorus-30, how many grams would remain after 27.5 min? • Mfinal = (55g)(.5)11 = 0.027g

  14. Semester I Review • Calculate the specific heat of an unknown metal, given that 25.0g of the metal lost 3570 J of energy during a temperature change from 100.0oC to 25.0oC • c = 3570J / (25.0g)x(75.0oC) • c = 1.90 J/goC

  15. Identify each of the letters on the graph and explain what is occurring. C = solid warming/cooling D = Phase change solid to liquid or vice versa E = liquid warming/cooling F = phase change liquid to gas or vice versa G = gas warming/cooling G F E D C Semester I Review

  16. Label the solid, liquid, and gas regions on the graph. Label the triple point and critical point At 600oC and 90 atm, what phase is yummygum in? Semester I Review • Label the solid, liquid, and gas regions on the graph. • Label the triple point and critical point • At 600oC and 90 atm, what phase is yummygum in? liquid Critical point liquid solid Triple point gas

  17. Semester I Review • Give the formula for the following compounds • 1) iron (II) arsenide Fe3As2 • 2) lead (II) sulfate PbSO4 • 3) lead (IV) hydroxide Pb(OH)4 • 4) copper (II) acetate Cu(C2H3O2)2 • 5) beryllium chloride BeCl2 • 6) ammonium chromate (NH4)2CrO4 • 7) silver oxide Ag2O • 8) potassium sulfide K2S

  18. Semester I Review • Give the name of the following compounds • 1) NaBr Sodium Bromide • 2) Sc(OH)3 Scandium (III) Hydroxide • 3) V2(SO4)3 Vanadium (III) Sulfate • 4) NH4F Ammonium Fluoride • 5) CaCO3 Calcium Carbonate • 6) NiPO4 Nickel (III) Phosphate • 7) Li2SO3 Lithium Sulfite • 8) Zn3P2 Zinc Phosphide • 9) Sr(C2H3O2)2 Strontium Acetate • 10) Cu2O Copper (I) Oxide

  19. Semester I Review • Name the compounds • H2SO3 Sulfurous Acid • H2S Hydrosulfuric acid • H3PO4 Phosphoric acid • HCN Hydrocyanic acid • H3P Hydrophosphoric acid • HBr Hydrobromic acid • HClO Hypochlorous acid

  20. Semester I Review • Give the formula for the following compounds • hydrofluoric acid HF • hydroselenic acid H2Se • carbonic acid H2CO3 • nitrous acid HNO2 • sulfuric acid H2SO4 • hydrobromic acid HBr • Chlorous acid HClO2

  21. Semester I Review • Antimony tribromide SbBr3 • Silicon difluoride SiF2 • Tetracarbon octahydride C4H8 • Dinitrogen monoxide N2O • Pentaphosphorous decoxide P5O10 • Sulfur hexachloride SF6

  22. Semester I Review • P2O5Diphosphorous pentoxide • SO2Sulfur dioxide • NO2 Nitrogen dioxide • AsCl3 Arsenic trichloride • P4H8 Tetraphosphorous octahydride

  23. Semester I Review • Balance and classify the reactions • _2_ C8H18 + _25_ O2 _16_ CO2 + _18_ H2O • ____ FeCl3 + _3__ NaOH  ____ Fe(OH)3 + _3__NaCl • _4__ P + __5_O2 _2__P2O5 • _2__ Na + _2__ H2O  __2_ NaOH + ____H2 • _2__ Ag2O  _4__ Ag + ____O2 • ____ S8 + _12_ O2 _8__ SO3

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