Which method of testing substances is a sure way to identify a chemical reaction? A. change in color
B. formation of bubbles
C. change in density
D. increase in temperature
E/ solubility in water

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88

1.17 mol hcl and 2.5 mol naoh react according to the equation hcl + naoh -> nacl + h2o . if the limiting reactant is hcl, determine the amount of excess reactant that remains. answer in units of mol.

Ground state electron configuration for element v