Which pair of elements has the most similar properties?

a. K and He

b. Li and B

c. I and Ca

d. N and P

Consider a solution that is 2.0*10-2 M in Fe2 + and 1.8*10-2 M in Mg2+. (Ksp for FeCO3 is 3.07*10-11 and Ksp for MgCO3 is 6.82*10-6.

Classify each of the changes as a physical change or a chemical change. "burning wood"

In natural convection heat transfer, the parameter is the Choose the right answer a) Nusselt number b) Rayleigh number c) Grashof number d) Lewis number

A metal cylinder contains 1 mol of nitrogen gas at STP. What will happen to the pressure if another mole of gas is added to the cylinder but the temperature does not change?

Identify the predominant intermolecular forces in each of these substances. Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more of the phrases are sorted incorrectly. 1. H 2 O 2.

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.

What properties of matter are intensive independent of their size

What is the density of an object having a mass of 8.0g and a volume of 25cm3

What is a Cilla? (In drawing)

Which term names the group of organisms able to interbreed and produce fertile offspring?