The half-life of a certain radioactive element is 1250 years. what percent of the atom remains after 7500 years?

Anhydrous magnesium nitrate will decompose when heated giving a white solid and a mixture of two gases X and Y

How will this system at equilibrium be affected by each of the conditions stated here? 2H2 (g) + O2 (g) + 2H20 (g) + heat removal of H2O addition of O2 decrease in pressure increase in temperature

Select all that apply. Select all the items that are public goods or services. roads education military police force

Which types of changes observe the law of conservation of mass? a. only changes of state b. only physical changes c. only chemical changes d. all of the above

Fluorine's atomic number is 9 and its atomic mass is 19. how many neutrons does fluorine have

How are real gases different from ideal gases?

Which one doesnt belong in the list below? A. a meter B. one liter C. One centimeter D. one kilometer

Which elements did curies discover

When rubidium metal is exposed to air, two atoms of rubidium, Rb, combine with one atom of oxygen. If 1.98 grams of rubidium is exposed to air, what will be the mass of the product in grams

Fission reactions can get of of control without what taking place?