Semester I Review ANSWERS

Semester I Review How many sig-figs are found in each number?    3001  

Semester I Review Round each number to three sig-figs.     

Semester I Review Which of the following is a mixture.  Pure watercompound  Clean airhomogenous mixture  Iron (II) oxide compound  Salt waterhomogenous mixture  Carbon dioxide compound

Semester I Review Which of the following is a chemical change.  Cutting paperphysical  Boiling waterphysical  Rusting ironchemical  Burning gasolinechemical

SymbolMass #Atomic #ProtonsNeutronsElectrons X - _25__ Y Z - _56__ Complete the table using the given numbers

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) =

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

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

Trial #MeasurementTrue Value = Accurate and precise 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 = % 34.50

Semester I Review 1. The splitting of a nucleus is known as ___fission _____. 2. The combining of two small nuclei to form a larger one is known as ____Fusion______. 3. Give the formula of an alpha particle and beta particle.

Semester I Review 1. Decay of polonium-218 by alpha (  ) emission. 1.  + 2. Decay of carbon – 14 by beta emission 3.  + 4. Decay of Thorium by an electron capture 5. + 

Semester I Review 1.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

Semester I Review A radioactive isotope decayed from grams to grams in 15 years. Determine the half-life of the isotope g = 200.0(0.5) X 64 = 2 X X = 6, so 6 half-lives have passed in 15 years. Therefore each half-life is 2.5 years long

Semester I Review Calculate the wavelength of electromagnetic radiation with a frequency of 6.5x10 16 Hz. 4.6x10 -9 m Calculate the energy of the above electromagnetic radiation. 4.3x J

Semester I Review If n=4; how many sublevels 4, Orbitals 16, and Electrons are present 32? T or F (p) sublevels have 7 orbitals T or F (d) sublevels hold only 6 electrons T or F (s) sublevels hold 2 electrons

Semester I Review For the element Cobalt; give the: Long hand electron configuration 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 7 Box and arrow notation Noble gas configuration [Ar] 4s 2 3d 7 Electron Dot Structure

Semester I Review Give the ion for each of the following elements: Sodium, Oxygen, Chlorine, Barium, Gallium, Sulfur, Nitrogen, Aluminum, Silver, Zinc, Cadmium

Give the formula for the following compounds 1)iron (II) arsenideFe 3 As 2 2)lead (II) sulfatePbSO 4 3)lead (IV) hydroxidePb(OH) 4 4)copper (II) acetateCu(C 2 H 3 O 2 ) 2 5)beryllium chlorideBeCl 2 6)ammonium chromate(NH 4 ) 2 CrO 4 7)silver oxideAg 2 O 8)potassium sulfide K 2 S Semester I Review

Give the name of the following compounds 1)NaBrSodium Bromide 2)Sc(OH) 3 Scandium (III) Hydroxide 3)V 2 (SO 4 ) 3 Vanadium (III) Sulfate 4)NH 4 FAmmonium Fluoride 5)CaCO 3 Calcium Carbonate 6)NiPO 4 Nickel (III) Phosphate 7)Li 2 SO 3 Lithium Sulfite 8)Zn 3 P 2 Zinc Phosphide 9)Sr(C 2 H 3 O 2 ) 2 Strontium Acetate 10)Cu 2 OCopper (I) Oxide Semester I Review