Science 6 7. Which is NOT a heterogeneous mixture?
a. fruit sald b. pencils and pens
c. marbles and pebbles d. vinegar

8. Why is a freshly squeezed orange juice called heterogeneous mixture?
a. no change can be observed
b. the components were completely dissolved
c. the components cannot be separated completely
d. the pulp component floats in a juice component

Adilute aqueous potassium nitrate solution is

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added