A white solid is heated and is observed to change to a liquid at 65 °C When the liquid is cooled, it becomes a white solid again at 65°C. Is the change chemical or Physical?

A sample of oxygen gas occupies a volume of 365.2 mL. When the volume is increased to 478.2 mL, the new pressure is 241.3 torr. What was the original pressure?

Does Silicon form a cation or is it anion?

The periodic table is based on an element's what

Given that the pH of a substance is 2.5, what is the pOH? A. 0 B. 3.5 C. 7.5 D. 11.5

A student dissolves of ammonia in of a solvent with a density of. The student notices that the volume of the solvent does not change when the ammonia dissolves in it. Calculate the molarity and molality of the student's solution.

A piece of iron can change in different ways. How is iron bending different from iron rusting?

Which organism would least likely be selectively bred A) Dandelions B) Nantes Carrots C) Belgian Blue Cattle D) Hypoallergenic Cats

You are given a clear solution of KNO3. Using 3-4 sentences explain how you would determine if the solution is unsaturated, saturated, or supersaturated

Which element combination (s) would result in electrons being shared? [] sodium (Na) and oxygen (O) [] carbon (C) and fluorine (F) [] oxygen (O) and hydrogen (H) [] aluminum (Al) and chlorine (Cl)

If you start with 4 moles of iron and 3 moles of oxygen to produce iron oxide, what is the limiting reagent? (You will need to balance the equation first.) Fe + O2 - > Fe2O3