If the chemical properties of a substance have not changed, has a chemical reaction occurred

Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent? (a) KCl (b) P4 (c) BF3 (d) SO2 (e) Br2 (f) NO2 For those substances with polar covalent bonds, which has the least polar bond?

What is the difference between scientific investigations and scientific knowledge?

How do the atomic mass and atomic number compare for helium? a) The atomic mass is greater. b) The atomic number is greater. c) The atomic mass and atomic number are equal. d) Helium does not have an atomic number.

When an experimenter draws a conclusion that he assumes will apply to all situations set up similarly to his test situation, even though he cannot possibly have examined all possible test scenarios, the experimenter is using what kind of reasoning?

What bonds are broken during the combustion of methane (ch4) to form water and carbon dioxide?

Why does the glass of water weigh less after the pill has dissolved? Why does the glass of water weigh less after the pill has dissolved? Nitrogen dioxide gas will be generated and released as the anti-acid pill dissolves.

Assume that the potential energy of the products in a chemical reaction is 60 kilojoules. this reaction would be exothermic if the potential energy of the reactants were

Which type of ions are formed when an acid is dissolved in water?

According to the collision theory, when can a chemical reaction occur? When enough activation energy is added to correct the orientation of the particle collisions When reactants collide with enough energy to intersect their valence shells and form

Why is ice less dense than water? A. When water freezes, it forms a crystal structure with less volume than liquid water. B. Ice crystallizes with an open structure, and the gaps that form between the water molecules in ice increase its volume. C.