4. sam releases a marble at point a on a ramp. what is the highest point the marble will reach?
a: almost to b
b: just past b
c: point c
d: the top of the hill equal to point c

6. i take a wooden plate and an aluminum plate out of the freezer, where they have been overnight. what is true of the temperature of the plates?
a: the aluminum plate will be at a lower temperature.
b: both will be at the same temperature.
c: the wooden plate will be at a lower temperature.

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