Which is not a possible clue that a chemical change has occurred?

A. The color changes.

B. The substance melts.

Which reaction results in the greatest increase in entropy? A. A → 2B B. A → B C. 2A → B D. 3A → B

Which observation indicates that the kinetic-molecular theory has limited use for describing a certain gas?

The amount of which subatomic particle is different between an atom and its ion?

The zinc in a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc).

Which of these is a mixture? A. carbon b. oxygen c. air d. Carbon Dioxide

The masses of reactants is always greater than the masses of the products in a chemical reaction, because the products are combined together. TRUE FALSE

How the elements calcium and chlorine would be named if they formed a chimical compound?

A basketball has a volume of 4.5 liters at 136.5 kPa how many liters would it be at 140.1 kPa

How many feet is 5642cm

A (n) bond forms when one atom gives up one or more electrons to another atom.