Answer the following questions about bec2 h2o(s) → bec2o4 (s) + 3 h2o(g) if 3.21 g of bec2 anhydrous beryllium oxalate is leftover? o4 (s) and its hydrate. (a) calculate the mass percent of carbon in the hydrated form of the solid that has the formula bec2 heated to 220.°c, bec2 o4 • 3 h2o(s) dehydrates completely as represented below. bec2 o4 • 3 h2o(s) is heated to 220 c, how much o4 • 3h2o (b) when o4 •

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100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.