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# Just the answers please thank you 27. If the half-life of a radioactive element is 500...

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just the answers please thank you
27. If the half-life of a radioactive element is 500 years and the original sample is 24 grams, how much of the sample will remain after 1500 years? A. 12 B. 6 C. 3 D. 1.5 30. Nickel-cadmium batteries are used in rechargeable electronic calculators. Which substance is oxidized in the following balanced reaction for recharging a NiCd battery? Ca(OH)2 (s) + Ni(OH)2 → Cd (s) + NiO2 (s) + 2H20 (1) A. H20 B. Ni2+ C. Cd(OH)2 D. Cd2+ 47. Which statement is true when the equilibrium constant Keq = 3.4 x 1012? A. Mostly products are present C. Mostly reactants are present B. Amount of reactants equals products D. None of the above 48. What type of reaction is: KCIO, → KCI + O2 A. Synthesis B. Single Replacement C. Decomposition D. Neutralization 49. A 14 g sample of N2 (8) occupies what volume at 0°C and 1.00 Atm? A. 5.60 L B.12.2L C. 14.0L D. 22.4 L 51. Which molecule is nonpalar but contains polar bonds? A. CO2 B. SO2 C. O D. CHCI 52. How much NaCl (s) is required to prepare 100 ml of a 4 M solution? (Use the molecular weight of NaCl-58 g/mol) A. 14.5 g B. 23.2 g C. 11.2 g D. 19.2 g

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