What happens to chemical bonds as a chemical reaction occurs? a. bonds in both the reactants and products are formed. b. bonds in the reactants are formed and bonds in the products are broken. c. bonds in both the reactants and products are broken. d. bonds in the reactants are broken and bonds in the products are formed.

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh