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25) The atomic number (Z) is the number of: a. Neutrons and protons b. Electrons and neutrons c. protons 26) The mass number is the total number of a. electrons+ Protons b. electrons+ neutrons c. none of these. 27) Atoms that have same atomic number but different mass number are called a) Isotopes b) Ternary atoms c) Allotropes Q3: a) How would you prepare 60.0 mL of 0.200 M HNO3 from a stock solution of 4.00 M HNO3 b) Calculate the pH of a 0.0010 M solution of formic acid, HCO2H. a. HCO2H + H2O ↔ HCO2- + H3O+ Ka = 1.8 x 10-4 c) Calculate the pH values of a solution of sodium hydroxide whose [OH–] is 1.05 x 10–3? Q5:Write the names of the following compounds: FeO BaCl2•2H2O N2O HNO3 HCLO4 CO2 Q7:Classify the chemical reactions in the following equations: 10 a) Na2CO3 à Na2O + CO2. b) Cu + AgNO3 à CuNO3 + Ag. c) Zn + HCl à ZnCl2 + H2. d) H2+ Cl2 à 2HCl
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