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larger fraction of lead than adults do. Lead levels of 0.250ppm in a child cause delayed
cognitive development. How many moles of lead present in 1.00g of child’s blood
would 0.250ppm represent.
6. Acetone, C3H6, is the main ingredient of nail polish remover. A solution is made up
by adding 35.0mL of acetone (d=0.790g/mL) to 50.0mL of ethyl alcohol, C2H6O
(d=0.789g/mL). Assuming volumes are additive, calculate (a) the mass percent of
acetone in the solution. (b) the volume percent of ethyl alcohol in the solution. (c) the
mole fraction of acetone in the solution.
Magnesium and nitrogen react to form an ionic compound. Predict which forms an anion, which forms a cation, and the charges of each ion. Write the symbol for each ion and name them.
2. Aluminum and carbon react to form an ionic compound. Predict which forms an anion, which forms a cation, and the charges of each ion. Write the symbol for each ion and name them
2. Aluminum and carbon react to form an ionic compound. Predict which forms an anion, which forms a cation, and the charges of each ion. Write the symbol for each ion and name them
1. Magnesium and nitrogen react to form an ionic compound. Predict which forms an anion, which forms a cation, and the charges of each ion. Write the symbol for each ion and name them.
A 5.38 g mixture contains both lithium fluoride, LiF, and potassium fluoride, KF. If the mixture contains 3.15 g fluorine, what is the mass of the KF in the mixture?
Calculate the grams of O 6.64 g Li3PO4
The energy (J) required for an electronic transition in a Bohr hydrogen atom from n = 2 to n = 3 is ________ J.
For the chemical equation
SO
2
(g)+NO
2
(g)↽−
−⇀
SO
3
(g)+NO(g)
SO2(g)+NO2(g)↽−−⇀SO3(g)+NO(g)
the equilibrium constant at a certain temperature is 3.90.
3.90. At this temperature, calculate the number of moles of NO
2
(g)
NO2(g) that must be added to 2.88 mol SO
2
(g)
2.88 mol SO2(g) in order to form 1.20 mol SO
3
(g)
1.20 mol SO3(g) at equilibrium.
SiCl4, PCI3, CaCl2, CsCl, CuCl2, and CrCl3 are these chlorides ionic or covalent
