What type of element are the following elements?

A) Na
B) Со
C) Bi
D) O

How many grams of magnesium metal will react completely with 8.3 liters of 5.5 m hcl? show all of the work needed to solve this problem. mg (s) + 2hcl (aq) → mgcl2 (aq) + h2 (g)

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

Omg imgonnafailnfiedkla use complete sentences to explain how the mass of hydrogen is conserved during cellular respiration.