Which reaction is a combustion?

a. fe + s8 → fes
b. h2o → h2 + o2
c. zn + hcl → zncl2 + h2
d. nacl + agno3 → nano3 + agcl
e. hbr + naoh → nabr + h2o
f. c10h8 + 12 o2 → 10 co2 + 4 h2o

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?

Your friend increases her force on the desk by 30n . she doesn't change the direction of her push . what happens to the net force on the desk .will the desk accelerate