The chemical reaction shown below is carried out in a coffee cup calorimeter. A student mixes 10.0 mL of 0.100 M H2A(aq) and 20 mL of 0.100 M NaOH(aq), both initially at 25 °C. The student records the highest temperature of 40. °C for the reaction. a) What indicates that this is an acid-base reaction? Explain your answer. b) Determine the amount of energy involved in the reaction in the coffee cup calorimeter. The density of the resulting solution is 1.00 g/mL and has the same specific heat capacity as water, 4.2 J/g °C. c) Determine the enthalpy of the reaction, in kJ/mol rxn.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

b. is the answer hoped i        

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied