Formula needed for Pb2+Cl-

What is the compound of P2O5

Why is the melting of ice a physical change?

A student collected nitrogen by displacing water in a graduated cylinder. the atmospheric pressure was 738.9 mmhg; the height of the water remaining in the cylinder was 13.2 mm; the partial pressure of the water was 18.8 mmhg.

A light year is equal to 5,866,000 5,866 5,866,000,000,000 5.866

What is the name of the acid HI

Compared to a sample of helium at STP, the same sample of helium at a higher temperature and a lower pressure A) condenses to a liquid. B) is more soluble in water C) forms diatomic molecules. D) behaves more like an ideal gas

What country was overrun by the Japanese

Radium has a half-life of 1,620 years. In how many years will a 1 kg sample of radium decay and reduce to 0.125 kg of radium? a. 1,620 years b. 3,240 years c. 4,860 years d. 6,480 years

Which the following atoms will not react with water? a. K b. Li c. Pb d. Na

Fluorin is often added to drinking water and toothpaste