Which if the following elements has atoms with the least amount of valence electrons

1. k

2. Ca

3. O

4. Mg

5. C

If you are told that one of them is Cr2O3 and the other is OsO4, which one do you expect to be the yellow solid? Cr2O3 OsO4

Which pair of elements do you expect to be most similar in their chemical properties? a. AgAg and KrKr b. OO and SS c. PbPb and OO d. AlAl and CaCa

What are the five main forms of energy

In a fission reaction of U-235, there was a release of 9.20 * 1011 kJ of energy. What amount of mass in kilograms would have been lost? Recall that c = 3 * 108 m/s.

A copper cube with a mass of 100 grams is heated in a boiling water bath to 100.0 Celsius. The cube is removed from the bath and placed on a very large block of ice which is at a temperature of 0.00 Celsius.

What % of the ideal soil is air?

Calculate the number of formula units in 4.55 grams of lithium carbonate, Li2CO3

What is the formula of sulfurous acid? H2S HSO4 H2SO4 H2SO3

How many Na + ions are found in 0.5 mol of Na2O?

Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 170 g of glycerin to 337 mL of H2O at 40.0°C? The vapor pressure of pure water at 40.0°C is 55.32 torr and its density is 0.992 g/cm3.