Which answer below correctly identifies the type of change and the explanation for the change in calcium carbonate?
physical change because even though a state change was observed, the calcium carbonate
retained its original properties
physical change because even though a particle size change was observed, the calcium
carbonate retained its original properties and was not transformed into a new substance
chemical change because a state change was observed, which indicated that the calcium
carbonate was transformed into a different substance
0 chemical change because a particle size change was observed, which indicated that the calcium
carbonate was transformed into a different substance

__ _ _ _ _ is the process of removing earth materials from their original sites through weathering and transport and depositing the in another location. a. erosion b. sedimentation c. lithification d. dissolution

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl+4h2o enter the elemental symbol. view available hint(s) is reduced