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

Bose-einstein condensation occurs at what temperature?

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.