BR - 3 Given the following reaction:                Fe2+ + Cr2O72-→ Fe3+ + Cr3+   Balance the reaction. The coefficient for water in the balanced reaction is:   a. none of these b. 3 c. 7 d. 5 e. 1

What is the oxidation number of sulphur in the molecule S8? Select one: A. +4 B. +2 C. -2 D. 0

Lithium batteries are used throughout our modern world – in cell phones, laptops, tablets, etc. In fact, if you are regularly recharging your device, it’s highly likely it contains a lithium ion battery. The lithium iron phosphate battery provides stable function over time. The overall reaction for the lithium iron phosphate battery is below: LiFePO4 + 6 C -> LiC6 + FePO4 A certain lithium battery weighs 0.6 g and has a capacity of 2250. mA hr (that is, the cell can store charge equivalent to a current of 2250. mA flowing for 1 hr). What is the capacity of this cell in coulombs? What mass of the reactants is needed to deliver 2250. mA hr? What percentage of the cell mass consists of reactants?

Single 1. As a chemical bond forms between 2 hydrogen atoms in a system, energy is released and the stability of the system Increases Decreases Remains the same 8. In a chemical reaction, as the species is oxidized, its oxidation number Decreases Increases Remains the same