Help me ASAP please for chemistry..

What is a metal replacement reaction

Which statement best explains the relationship between an area is geography and the temperature of its surface water

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided