Which equation shows a physical change?

Pb (NO3) 2 (aq) + 2KI (aq) _ 2KNO3 (aq) + PbI2 (s)

HCl (aq) + NaOH (aq) _ NaCl (aq) + H2O (l)

2H2O (l) _ 2H2 (g) + O2 (g)

H2O (g) _ H2O (s)

What is the total number of electrons in all s orbitals of a neutral atom of phosphorus?

When solid (NH4) (NH2CO2) (NH4) (NH2CO2) is introduced into an evacuated flask at 25 ∘C∘C, the total pressure of gas at equilibrium is 0.116 atmatm. What is the value of KpKp at 25 ∘C∘C?

What is the most common natural fiber used in textiles?

A compound containing phosphorus and oxygen has a molar mass of 219.9 g/mol and an empirical formula of p2o3. Determine its molecular formula.

Alli and her classmates want to know which species of oak produces the acorns that squirrels prefer. Which possible procedure is likely to produce the most reliable results?

What is the volume of 2.00 moles of chlorine (cl2) gas at stp, to the nearest tenth of a liter?

A reaction of 12.640 g of copper oxide with 0.316 g hydrogen produces 2.844 g of water and Xg of copper. X=_9

If i burn steel wool inside a closed jar or bottle will the oxygen be completly gone

700 grams of glucose reacted fully with oxygen How many moles of gas will be created

The uranium used for nuclear fuel exists in nature in several minerals. Calculate how many moles of uranium are in 8.00 moles of the following: 1. carnotite, K2 (UO2) 2 (VO4) 2 • 3H2O 2. uranophane, CaU2Si2O11 • 7H2O 3.