Percent occurrence and isotope masses for oxygen: 99.759 % at 15.99491 amu, 0.037% at 16.99913 amu and 0.204% at what amu value if the average atomic mass is 15.99937 amu?

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver