What is formed when a sodium atom and chlorine atom react chemically? 1. An element
2. A compound
3. An electron
4. A neutron

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water