Josh decided to mix some vinegar with baking soda. he knew that a reaction occurred because he made careful observations. he noted that the mixture started to foam up and bubble and was white in color. how did josh know that a chemical reaction occured? he was sure a reaction occurred because of a) the formation of a gas. b) the color of the mixture. c) the smell of the vinegar. d) the volume of the mixture.

its A

Explanation: i did the test myself so i know its A

(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

the answer is yes

it has kinetic energy

reason

an object has kinetic energy when you stop the force carrying it, the object will stay in motion.

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