True or false? all four types of macromolecules always contain carbon (c), hydrogen (h), and oxygen (o), but not all of them contain nitrogen (n).

The clouds are grey and ground is wet. a quantitative b qualitative

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.