A water molecule is made up of one oxygen and two hydrogen atoms. Why is water considered a pure substance? - Water can be combined with other substances by physical means.
- Water molecules are made up of different types of atoms.
- Water can not be broken down by physical means.
- Each water molecule has an identical composition and properties.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]