QUESTION 4 Which statement is not true about steam distillations? Steam distilla

Question

QUESTION 4 Which statement is not true about steam distillations? Steam distillations are useful for purifying compounds that are heat sensitive. Any distillation can be converted to a steam distillation by adding water. Steam distillations can be used for volatile liquid and volatile solid samples. Distllation ranges in steam distillations do not represent normal boiling points. QUESTION5 If your spice oil has antibacterial activity, then after 24 hours... The area surrounding the testing disk will have no bacteria growth. The testing disk will be covered in bacteria. All bacteria growth on the agar plate will have stopped. The testing disk will turn pink to indicate bacterial death. QUESTION 6 Suppose you obtain 0.21 g of cuminaldehyde. What volume of acetone do you need to make a 5.0% wt/vol solution? 1.05 mL 24 mL 0.24 mL 4.2 mL

Explanation / Answer

wt/vol% = the amount of solute present in 100 ml solutuion

wt/vol% = w/v*100

5.0 = (0.21/x)*100

x = volume of acetone required = 4.2 ml

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