The table displays temperature of substance A and substance B near each other but not touching in a room 25 °C. Temperature was taken at three time intervals. which of the following statements support the data in the table? time 2pm (Sub A )32°C (Sub B) 25°C time 2:05pm (Sub A) 29°C (Sub B) 25°C time 2:10pm (Sub A) 26°C (Sub B) 25°C -Both substances gained energy
-Both substances lost energy
-Energy list by substance A was transferred to substance B
-Energy was lost by substance A to the environment.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

(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