Which of the following is a physical change?

A. magnetzing an iron rod

B. roasting marshmallows on a campfire

c. milk souring

D. an antacid neutralizing stomach acid

What is the oxidation number of Nitrogen in HNO2? +1 -1 +3 -3

Why do volcanoes erupt?

For which structure (s) does the electron-bearing carbon atom have a formal charge of zero

Gold and hydrochloric acid balance equation

For the following equilibrium system, which of the following changes will form more CaCO3? CO2 (g) + Ca (OH) 2 (s) ⇌ CaCO3 (s) + H2O (l) ΔH o rxn = - 113 kJ a. Decrease temperature at constant pressure (no phase change). b.

How many molecules are in 4.50 moles of water

N aqueous solution of sodium hydroxide is standardized by titration with a 0.154 m solution of hydrochloric acid. if 17.5 ml of base are required to neutralize 17.6 ml of the acid, what is the molarity of the sodium hydroxide solution?

Consider the positions of barium (Ba), sulfur (S), silicon (Si), and calcium (Ca) on the periodic table. The atoms of which element require the least amount of energy to give up an electron when forming chemical bonds?

what is way to find the numbers of liters in 8 kilometers? (A.) Add 5,000 and 3, because you are adding 3 kiloliters to 5,000 liters. (B.) Multiply 8 by 3,000, because each kiloliter has 3,000 liters. (C.

How much energy must be added to 2 mol H2O (g) to cause it to decompose into H2 and 02? KJ