The diagram shows an investigation where four materials are added to pure water and then stirred.
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Observations of the water are made before and after the materials have been stirred. Which BEST
describes this investigation?
This investigation is testing solubility which is a physical property.
This investigation is testing reactivity which is a chemical property.
This investigation is testing solubility which is a chemical property
This investigation is testing reactivity which is a physical property.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

d

explanation:

(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