Which equation represents a redox reaction? 1.
2Na+ + S2- → Na2S
2.
H+ + C2H302 — HC2H302
3.
NH3 + H+ + Cl - NH4+ + Cr-
4.
Cu + 2Ag+ + 2NO3- — 2Ag + Cu2+ + 2NO3-
help please

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

Which of the following changes will decrease the total amount of gaseous solute able to be dissolved in a liter of liquid water? (2 points) decreasing temperature decreasing pressure decreasing surface area decreasing solute concentration