Two pieces of tubing are measured to be 4.5 cm and 3.222cm. What is the total length of the tubing expressed with the correct significant figures?

List four observations that indicate that a chemical reaction may be taking place

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

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate