9. Which of the following would be the shortest covalent bond between the same two atoms? a) single bond c) triple bond b) double bond d) they are all the same length

22 6. compound. lomso leal to i ba readin A The mass percent of water in a hydrate of MnCl, is 36.41%. What is the empirical formula of the hydrate? 7. 8.* A 4.00 gram sample of a hydrate of nickel(II) bromide loses 0.793 grams of water when heated. Determine the mass percent water in the hydrate and the formula of the hydrate. a gnininoo to colbe ts ano onis laubn olaodlo eaM 8 9. A 2.500 gram sample of a hydrate of calcium sulfate loses 0.523 grams of water when heated. Determine the mass percent of water in the hydrate and the formula of the hydrate. 01 bbol obiboi 10. An unknown solution containing one of the salts ZnSO4, MgSO, or SrCl, gives a negative flame test but tarnishes a piece of magnesium inserted into the solution. Which salt was in the solution? 11. The heating of CuSO,· 5H,O yields several transitions as a function of temperature. The table below gives the percentage of original mass lost as a function of the approximate temperature. Use these percentages to determine…

Consider these statements about an element E in Group SA: . E is essential to life, found in bones, teeth, cell membranes, and energy-storage molecules. It is usually found in living tissue as the anion formed by one E and four O atoms. This anion is also found in many minerals. . E forms pyramidal E, molecules under standard conditions, although these molecules can also fuse with each other to form extended chains of bonded E th atoms. E has the most allotropes of any Group SA element. Among the more common forms, the soft white allotrope is dangerously flammable in air, while the harder red, violet and black allotropes are more stable. At 1 atm and room temperature, the most common form of E is a waxy white solid that glows faintly yellow-green when exposed to air x Oyes 5 Are all of these statements true about the same Group 5A element? no If you said yes, what is E? Enter its chemical symbol: 0

45.5 grams of a magnesium reacts with 243.2 grams of oxygen gas. At the end of reaction, 211.2 grams of oxygen did not react while no magnesium was left. Since the only product is magnesium oxide what is the mass of magnesium oxide formed? 5- a) 77.5 g b) O 277 g 288.7 g d) 71.5 g Boş bırak