X2SO3 Enter the group number of X. How do I find this? Chemistry

Na2CrO4 + PbCL2 Formula in double replacement

Which term best describes the role of hydrogen gas in the formation of a water molecule? catalyst inhibitor product reactant

The shape of a sign warns you of what is ahead

The sun is composed mostly of hydrogen. The mass of the sun is 2.0x10^30 kg, and the mass of a hydrogen atom is 1.67x10^-27 kg. Estimate the number of atoms in the sun.

The continents of Africa and South America used to "fit together" like puzzle pieces. About how far back in time would you have to go to find Africa and South America connected together?

A catalyst can only be used once. True False

On what basis do we distinguish between substances and separate them from one another?

What is the net ionic equation for the following reaction? H2CrO4 + Ba (OH) 2

How does improving food-storage facilities make farming more sustainable? A. It decreases the amount of water needed. B. It keeps food from rotting as quickly and being wasted. C. It decreases the amount of land needed. D.

Which of the following shows the correct net ionic equation for the reaction between HCl and NH3?