Question

CHEMICAL STOICHIOMETRY PRE-LAB -1 Summerterm 2019 Lecture prof. Name This exercise is due at the beginning of your regular lab perod during on Monday 63/19. This assignment is worth 15 points. BRING TO LAB ON MONDAY 6/3/19 CHEMISTRY TEXT BOOK & LECTURE NOTES & A SCIENTIFIC CALCULATOR. You will NOT be allowed to use your phone as a calculator. Complete the table #of neutrons Symbo Element name #of electrons Net charge #of protons Ca 02 Co3 32 c 16 2. Name the following compounds: KI Fe,O CrNO NaSCN Cu(OH 3. Write the chemical formula for the following compounds: cobalt ( carbonater iron) sufate potassium pemanganate magnesium phosphate- ammonium dichromate-

Answer 1

40 24 Ca LElement (odtinm calcium Name 20 Mass Numbea- Numbea of protons t Nunber of Neutaons Afomic Number = Numbea of paro tons=Numbes of electrons 27 40 24 Fon Ca 20 Numben of photons 20 Numbes of Neutsons = 40-20 20 change Since +2 electhons s= 20-2 = 18 of Numbes 5ini laaly calculaeng elements gi ves Eo ofhea

No of No of No of electrons chaige Ne tnbol Element Name fhotons Neutaons 40 24 Ca 20 Calcium 40 +2 20 2- 16 OXgen mbes Cobalt Co Phons 31 27 24 +3 14 Ni 7 vabokyey 22 16 16 16 Sulphus 16 Potassium Iodide KT IAONCI 0xide Fe03 ves CANO Chnomium( NiEnate Sodium Thiocyanate Na SCN Coppea C) Hydoxide

Co, Cco Cobalt fil Cantonate Fe, (soe Sulfate IAon KMAO4 folassium peamanganate MI3 CPON'S Magnesium phosphate (NH CH0 Ammonium dich gomate