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2019 NECO COMPUTER ANSWERS ===================================== COMPUTER-OBJ! 1BBEAEAADEC 11ACCEEADAAE 21EBAEEAEECA 31ECEEEEEEAA 41CEDEBEABDA 51DABBCBEABB ===================================== *ESSAY/THEORY* ______________________ *Number 1* (1a) *(Please Tabulate)* -Web address is the URL of your web page while Email is used to send electronic messages to each other using computer networks. -Email you can always receives electronic mails while web address is not used to receive any mails sent to you. -The email address is oftenly used in lower case while websites or web address are written in mixed letters. -Example of Web address www.google.com While Example of Email address Profodumodu@gmail.com ===================================== *Number 2* (2ai) master file: Master file is a computer file that is used in collection of records pertaining to one of the main

CHEMISTRY-OBJ! 1CEDEABCCEC 11ACDCBCDCAB 21EAECBCDBAC 31BBBACCBBDD 41ACDEEACBDB 51CCEBCBBCBD ===================================== (4ai) Sublimation is the process whereby a solid changes state directly to the gaseous state without passing through the liquid state upon heating (4aii) Iodine and Ammonium chloride (4b) (i) He may have conducted the experiment in a partial vacuum (ii) Addition of impurities like salt (iii) T°K = 78 +273 = 351K (4ci) (i)presence of moisture (ii)presence of oxygen (4cii) 4Al(NO3)3(s) ------> 2Al2O3(s) +3O2(q) + 12NO2(q) (4ciii) (i)sols and gels (ii)Aerosols (iii)Emulsion (4d) Using CAVA/CBVB =nA/nB 0.122*20.50/CB * 25.00 = 2/1 CB = 0.05002moles/dm^3 Using : Gram conc = molar conc * molar mass Molar mass of hydrated salt = 6.203 * 1/0.05002 =124g/mol Now; 106 + (18x)= 124 18x = 124 - 106 18x = 18 x = 18/18 = 1 SaH was NaCO3. H2O (4e) (i)the metal is potassium (ii) period 4 (iii)group 1 (iv)2k(s) + 2H2O