How to calculate force of attraction between cation and anion?

A material absorbs or reflects all of the light that reaches it. What type of material is it? A. pigmented B. translucent C. transparent D. opaque

When a negatively charged object moves in the opposite direction of an eletric field the potential energy of the object ... A. Becomes zero B. inceases C. decreases D. stays the same

If Peter carries a 20 kg weight up a flight of stairs in 20 seconds and Mary carries the same 20kg weight up a flight of stairs in 30 seconds, who does the most work?

Anybody know anything on Biomolecules?

Which statements are true of fossil fuels? Check all that apply. A. The burning of them contributes to global warming. B. They produce harmful waste. C. They come from water. D. They are renewable.

A flask of fixed volume contains 1.00 mole of gaseous carbon dioxide and 88.0 g of solid carbon dioxide. the original pressure and temperature in the flask is 1.00 atm and 300. k. all of the solid carbon dioxide sublimes.

Oxygen is in group 16 of the periodic table. An oxygen ion (O2-) has a charge of - 2. Which of the following would be most likely to combine with an oxygen ion to form a new compound?

How and why - Why does ice float on water

Measurements show that enthalpy of a mixture of gaseous reactants decreases by 228. kJ during a certain chemical reaction, which is carried out at a constant pressure.

When 9.8 mol Fe react with 11.5 mol HCl, what is the limiting reactant and how many moles of H2 can be formed? unbalanced equation: Fe + HCl yields FeCl3 + H2 HCl is the limiting reactant, and 3.