Note: There may be several correct answers. You only need to draw one of them. You do not need to draw any of the sid products of the reaction. Occ Ċ + Br Click and drag to start drawing a structure.

28. (a) In Figure P7.7, which sphere could represent a Na atom, Nation, and K atom? Provide an explanation for your choice. (b) In Figure P7.7, which sphere could represent an O atom, S atom, and S2- ion? Provide an explanation for your choice. FIGURE P7.7 (b) (c)

3) In a far away land and long ago, a series of experiments were carried out. Three samples of minerals where collected, and the sample were analyzed, and found to contain two elements kalium and pyron. . They use K for kalium and HO for pyron. Sample..... A (from a mine). . B (from a dry lake).. . .. C (from the foundation of a castle). 0.8729 Mass (g) g of Kalium g of Pyron 0.5236 0.2755 0.2481 0.6918 0.4770 0.2148 0.4592 0.4137 Use the Law of Conservation of Mass to determine if the data is worth using. sample A (froma mine) (g) 0. S236 sample B Cfrom O.6918 (9) o. 2755 + O 248TED Thus every sample has different vawes of the Same element, the mess of each sample is equal to the addifio of itscomponents, wich states that the mess of the procloct matches the mass of the' sample. dry lake) 9) a 0.4770 + 0.2148 Io sample c (frome fondatior ofecosfle O, 8729 0.4592 K+ 0.4137 30 Use the Law of Constant Composition to determine if any of the samples could be the same substance. Use the Law…

16) What's the atomic number of sulfur-34 ? A) 34 B) 18 C) 16 17) In the formula of hydroxylapatite Cano(PO4)6(OH), determine the number of each kind of atom, Ca, O, H, P: A) Ca – 10; O – 8; H – 2; P - 6 с) Са — 10; О —12;B Н — 2;B Р - 6 в) Cа — 10; О — 26;B Н — 23B Р - 6 D) Ca – 10; O – 26; H – 2; P - 1 18) Which element is represented by the chemical symbol TI ? A) tantalum B) thorium C) thallium 19) The fact that water is 11.2 % hydroen and 88.8 % oxygen by mass regardless of its origin is an example of B) law of conservation of mass C) law of definite proportions A) Dalton's atomic theory