Which of the following is a physical change?

-Burning

-Rusting

-Freezing

-Oxidation

When 2.5000 g of an oxide of mercury, (HgxOy) is decomposed into the elements by heating, 2.405 g of mercury are produced. Calculate the empirical formula.

What example show the transformation for electrical change to radiant?

Consider the equation CaF2 + H2SO4 → CaSO4 + 2 HF. What type of reaction is this? A. synthesis B. decomposition C. single displacement D. double displacement ... ?

What is the molarity of ZnCl2 that forms when 20.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 255 mL. Zn (s) + CuCl2 (aq) →ZnCl2 (aq) + Cu (s)

A new mild dish detergent is being tested before putting it on the market. if the new detergent were tested with 0-14 ph test paper, what color would the indicator paper be most likely to turn?

2. An automobile tire has a pressure of 210 kPa at 293 K. What will be the tire pressure after driving, if the tire temperature rises to 308 K?

Students measuring the mass of a rock record 6.759 g, 6.786 g, 6.812 g, and 6.779 g. Which other measurement of the block's mass would be most precise? A. 6.702 g B. 6.781 g C. 6.605 g D. 6.858 g

What two elements make up dihydrogen monoxide?

What did scientists observe using the earliest microscopes

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.