What is the number of valence electrons in the outermost energy level of an element in goup 15a?

What is the molarity of a solution that contains 75.0 g of KNO, dissolved in 0.350 L of solution?

how many joules of heat are absorbed when the tempurature of a 13.9 g sample of CaCO3 (s) increases from 21.7C to 33.3 C? specific heat of calcium carbonate is. 82 J/g-K

You have a box that has a volume of 412cm and weighs 42g what is its density

Write the net ionic equation for the reaction of zinc metal with aqueous iron (II) nitrate. Include physical states.

What is the formula for single replacement reaction

Every water molecule has two hydrogen atoms bonded at one oxygen atom. This fact supports the concept that elements in a compound are

What is the mass of 9 atom (s) of copper in grams?

Andy has two samples of liquids. Sample A has pH of 4, and sample B has a pH of 6. what can Andy conclude about these two samples? Sample A is a neutral b alkali c acidic Sample B is a neutral b alkali c acidic

How does a lone pair contribute to molecular shape? A. It is too small to affect the molecule's shape. B. It takes up space like an "invisible" atom. C. It forces the molecule into a tetrahedral shape. D. It lets the bonding pairs spread out more.

The are of a rectangle is 12 in^2. what is the area in cm^2. there are 2.54cm in an inch.