If 50% of radioactive element remains after 4000 years what what is the half life

A liquid would boil at the lowest temperature at a pressure of

Apply. How are kinetic and potential energy involved when using a pair of scissors?

Water can be found in many forms: Tap water, spring water, sparkling water, sea water, distilled water, flavoured water, etc. Only ONE of these forms is not a mixture. Identify this form and explain your answer.

If 3 molecules of hydrogen react with 1 molecule of nitrogen, how many molecules of ammonia would be formed?

Does a gas phase have heterogenous properties?

How are elements arranged in the Periodic Table? A. by their properties B. alphabetically C. by how much they are worth D. in the order they were discovered

If an iron nail is placed in a glass of water the nail will sink. Is the density of iron smaller than or larger than the density of water? explain

What is made when salt is dissolved in water? A a precipitate B a mixure C a solution D a compound

What type of electromagnetic waves does the human eye see as the colors red blue or green A Visible light waves B Radio waves C infrared waves D microwaves

10. What is the molarity of a MnO4 - solution if 23.5 mL of this solution is required to react completely with 30.0 mL of 0.134 M Fe2 solution according to the equation 5Fe2 (aq) MnO4 - (aq) 8H (aq) - --> 5Fe3 (aq) Mn2 (aq) 4H2O (l)