For the majority of minerals, the streak obtained when the mineral is scratched against a porcelain plate is a. only useful if the mineral is softer than the porcelain streak plate. b. always dark brown or black. c. always diagnostic of that mineral. d. not useful, because the porcelain will often chemically react with the mineral.

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

What three things determine the shape and size of a puddle when water is poured out onto a surface

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.