Naturally occurring limestone contains two forms of CaCO3 called calcite and aragonite. They differ in their crystal structure. High grade calcite crystals were used in WWII for gun sights, especially in anti-aircraft weaponry. Aragonite is used in jewelry and glassmaking. Using the following Ksp values, calculate the concentration of calcium in each in M. (a) Ksp calcite = 3.4*10^(-9)

(b) Ksp Aragonite = 6.0*10^(-9)

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.