During a chemical reaction, heat is absorbed. What kind of reaction occurred? A)
An endothermic reaction
B)
An exothermic reaction

How many atoms are there in 5.70 mol of mg

Why are pipes bursting in the in extremely cold weather?

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