Upal. Consider the elements sodium, aluminium, silicon and sulphur. Which one will form
an oxide that will give a pH of less than 7 when in solution?​

2. how is heavy water different from normal water

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j