What is the percent ionization of H2NNH2 in a solution with a concentration of a 0.560 M? (Kb = 1.3 × 10-6)

Which of the following is based upon repeatable data and is no longer tentative? -Theory -Scientific Law -Hypothesis

presented by Macmillan Classify each of the substances as an element or compound. Element Compound Answer Bank FeN CuSO, Co CO

Canvas Question 46 A The date on a penny recovered from the floor of Ruggles MBTA stop is unreadable. The following data for this penny are then collected. Measurement Value Density of Pure Copper Density of Pure Zinc Diameter of Penny Thickness of Penny Mass of Penny 8.96 g/cm³ 7.140 g/cm³ 19.05 mm 1.52 mm 3.878 g Given the facts below, which can you conclude about this penny? Minting Date of Penny Pre-1982 Composition by Mass 100% Cu 1982-Present 2.5% Cu, 97.5% Zn O the penny was minted before 1982 and contains 3.675 x 1022 atoms Cu O the penny was minted after 1982 and contains 3.483 x 1022 atoms Cu O the penny was minted before 1982 and contains 9.1187 x 1020 atoms Cu O the penny was minted after 1982 and contains 8.930 x 1020 atoms Cu $ 4 % M 5 MacBook Pro T A 6 & Y 7 1 8 U J 9 1 O O K 2