How many moles of oxygen are required to fully react with 100 kg of lead sulfide?

Which of the following statements is true? Elements in the last period are radioactive. Atomic weight is the same as atomic mass. Elements in the same group have the same number of electron shells.

Student took 1.52ml of a stock CuSO4 solution, with a given concentration of 3.26mg/ml. He then added water to the solution until the total volume was 10.00ml. What was the final concentration of the CuSO4 solution after the water was added?

Of the elements in group 13 (3a), predict which has (a) the largest atomic radius (b) the largest electronegativity, and (c) the smallest ionization energy. explain your predictions yahoo answers

What salt is produced in hn o 3 (aq) koh (aq) → h 2 o (l) ?

A swimmer can swim at a speed of 2.8 m/s for 6 minutes. What distance will she cover in that time?

Internal respiration is the transfer of oxygen and carbon dioxide from the lungs to the tissue cells of the body. True or False

Which element is a metalloid? 1. Al 2. Ar 3. As 4. Aa

You move a 25N object 4 meters. Find the work you did

What is the relationship between matter and elements

Which of these would be an appropriate way to describe the concentration of orange candies? Check all that apply the number of orange candies divided by total number of candies the mass of orange candies divided by total mass of candies the volume