Part A: Writing hypothesis i
A scientist wants to investigate the effect of concentration of nutrient agar to the growth of bacteria. He
created 3 set ups: A) 30 g nutrient agar powder in 1 L H2O B) 40 g nutrient agar power in IL H2O
C) 50 g nutrient agar powder in 1 L H2O.
1) Based from the given cenario, CREATE a testable hypothesis using IF-THEN- BECAUSE
statements. (3 marks)
2) Using your hypothesis, IDENTIFY the dependent and the independent variables. (3 marks)

A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.