2. Which types of changes observe the law of

conservation of mass?

A. only changes of state

B. only physical changes

C. only chemical changes

D. physical changes and chemical changes

Predict the formula for a compound made from x2 + and y2-

What are the coefficients for the following reaction when it is properly balanced?? potassium iodide + ? lead (II) acetate lead (II) iodide + -potassium acetate 3,2,2,1 1,1,2,2 none of these

Will larger crystals will be formed when molten rock cools more slowly

What type of force holds particles together?

What mass of carbon monooxide must be burned to produce 175 kJ of heat under standard state condaitions?

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?

Which microscope came out first

Which exerts greater pressure on the floor-standing flat-footed or standing on tiptoe? on tiptoe, because the force acts over less area on tiptoe, because the force acts over more area flat-footed, because the force acts over more area flat-footed,

1. Sara tells Michael she is 160 centimeters tall, while Michael says he is 60 inches tall. If there are 2.54 centimeters in an inch, who is taller