25 Points Please Help ASAP Will Mark Brainliest If All Are Answered!!

Answers in explanation.

Explanation:

30. A (A chemical changes changes the chemical properties)

31. C (rusting is an example of a chemical change

32. B (A reaction requires energy, so some energy will be expelled)

33. B (Color change is an example of a chemical change)

34. A (The law of the conservation of mass: Mass and Energy cannot be created nor destroyed)

(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

answermeridional ;