University:
University of California, Berkeley
Course:
CHEM | Chemistry
Academic year:

2020
Views:

359

Pages:

4
Author:

5CelestialChronicle

ANSWER KEY 4.16) How many kilojoules (kJ) of heat are required to heat 65 g of lead from 22.0 degrees C to 98.5 degrees C? LIT q=mc( ) ( 65g )( 0.128 q= of 636.48 = 640J x J/g°C ) ( 98.5°C - 22.0°C ) J 1J KJ 0.64 = 7000 KJ 5.14) What is the nuclear composition of the five naturally occurring isotopes of zinc having mass numbers 64, 66, 67, 68, and 70? 30 NUMBER ZINC ATOMIC = 64 - 30 34 = NEUTRONS : • ETC . 5.16) Identify the element represented by the drawing below and give the isotopic notation for it. ? - . \ atomic - mass . I SB I # - ' 10 atomic - 5 5 PROTONS NEUTRONS 5.20) Write isotopic notation symbols for each of the following: OZ Ht 109 (a) Z = 47, A=109 47 (b) Z = 8, A=18 18 (c) Z=26, A=57 57 Ag 80 26 FE 5.22) Write the number of protons, neutrons, and electrons in the following isotopes. (a) 54 Fe 4) f) (b) 23Na 26 = ( o) 28 = 26 = (t) = 11 ( f) = It 07=44 -3=35 0512 3=15 ( t) (c) Bromine-79 (79Br) 35 -_ C C (d) Phosphorus-31 (31P) ( t) 15 = ( o) = 16 c- 1) Complete the following table. Chemical System Isotopic Notation Atomic Number Mass Number Number of Protons Number of Neutrons Number of Electrons Cl 3¥01 17 36 17 19 17 ¥0 8 16 8 8 10 4thH I 2 I 1 3,9kt 19 39 19 20 ftAu 79 197 79 118 - 3 K+ Au ' . 1 to 18 79 X6.24) Write the name of each compound: (a) Ca(HSO4)2 " Calcium t (b) As2(SO3)3 arsenic - (c) Sn(NO2)2 (d) CuI tin ( III ) sulfite HIT nitrite potassium hydrogen r (g) (NH4)2CO3 Ammonium carbonate (h) (NH4)2HPO4 ✓ (i) NaClO sulfate Copper E) iodide (e) KHCO3 (f) BiAsO4 hydrogen sodium (j) KMnO4 ✓ hypochlorite carbonate KNOW CHARGE 6.22) Write g formulas for these compounds: MEMORIZED 04 IPO H' IT (b) Magnesium hydride [ 2- ① (a) Sodium chromate KNOW CHARGE T Mg Hz → REMEMBER IS THIS (c) Nickel (II) acetate Ni " CHARGED NEG . HYDROGEN Hs @ OIL Nater MEMORIZED €¥⇐ (d) Calcium chlorate Ca10512 @ " Bros L Mgl ¥¥e (e) Magnesium Bromate - €¥ze ' (f) Potassium dihydrogen phosphate (g) Manganese (II) hydroxide O Hta @ Hoos Mn MEMORIZED (h) Cobalt (II) hydrogen carbonate 0 (i) Sodium hypochlorite " ( Co Nato ) @ 10452 BE (j) Barium perchlorate (k) Chromium (III) sulfite ( Cpt )5 #) (l) Antimony (III) sulfate ( Sbs -71504273 (m) Sodium oxalate Nazc (n) Potassium thiocyanate , 204 KSCN z - ) )