What is the definition of half-life?

A 1.5 L container holds 0.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50. C. What is the molar mass of the unknown gas? A.) 0.16g/mol B.) 0.025 g/mol C.) 2030 g/mol D.) 20.1 g/mol

If the [OH] = 10^-4 then what is the pH of the solution?

In baking biscuits and other quick breads, the baking powder reacts to release carbon dioxide bubbles. The carbon dioxide bubbles cause the dough to rise. is this chemical or physical

A solution contains 2 meq/ml of kcl. if a 20 ml ampule of this solution is diluted to 1 liter what is the percent strength of the resulting solution

Put the elements in order from lowest (1) to highest (6) electronegativity. aluminum barium copper fluoride phosphorus francium

Given the reaction: 2 Na (s) + Cl 2 (g) → 2 NaCl (s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl 2 ≡ 2 mol NaCl. True or false?

Taking a cross section of a fiber can reveal what?

A? relay is a relay that not only maintains its contacts in the last position without a continuously energized coil, but also with a mechanical mechanism or remnant magnetism until it resets electrically.

What is a "curie"? A. standard charge of alpha particles B. mass of one alpha particle C. unit of radioactive disintegration D. a unit of gamma radiation

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will a. remain stable. b. change into a different element altogether. c. emit neutral particles and no energy. d. none of the above