CH4 + 2 CO2 —> 2 H2O What type of chemical reaction is taking place in this chemical equation?

Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion

A__ is two or more substances that are together in the same place but are not chemically combined

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

What is the approximate mass of 25 cm3 of silver, if the density is 10.5 g/cm3? a. 0.42 g b. 2.4 g c. 42 g d. 260 g