Which of the following are hazards in the first Copper experiment? Check all that apply. Group of answer choices

phosphoric acid

nitric acid

sodium hydroxide

NO2 gas

What is the density of the black hole

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work