Q3 Consider the reaction:
C2H5OH(1) + 302 (9) ---> 2002(g) + 3H2O(1)
AH--1.37X103 kJ
When a 8.11 g sample of carbon dioxide is burned, how much energy is
released as heat?
A. 126.3 kJ of heat released
B. 0.737 kJ of heat released
C. 148.7 kJ of heat released
D. 3.40 x 104 kJ of heat released

answer seismograph;

(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

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.