A contains 0.25mole of HCl per 250cm3 of solution. B is a solution of Na2CO3
In a titration experiment 25cm3 of B required 23.50cm3 of A for complete reaction a. Calculate:
i. Concentration of B in mol/dm3
ii. Number of sodium ion that would be present in 1dm3 of solution B
iii. Mass of Na2CO3 that will be required to prepare 200cm3of solution B
(Na = 23, O = 16, Avogadro Number = 6.02 x 1023)
iv. Name the suitable indicator for the titration and the colour at the end of the of the titration
v. Describe briefly how water can be obtained from the titration mixture

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

(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