Systematic tests are often used to identify and characterize the structure of an unknown
substance. The tests are set up to confirm or eliminate the possibility of a functional group
present in the compound. In this experiment, two unknown, l
A Grignard reagent is an organometallic reagent with a negatively
charged carbon bonded to a metal. The purpose of the reagent is to attack a
partially positive carbon to form new carbon-carbon bonds through
nucleophilic addition reaction. In
EXPERIMENT 4: KINETICS OF NUCLEOPHILIC SUBSTITUTIONS
1. It a first order reaction since the increase in the OH- concentration in part 1A did not cause a
significant change in the rate constant.
Sample k Calculation:
kt =2.303( log 1x )
k 1=2.303 log
1. The melting point of the pure 2,4-DNPH derivative of benzaldehyde is
237C, the measured value is found to be 95-120C. A lower melting
point range could indicate that the sample was contaminated with
trace amounts of impurities.
2. The iodine oxidizes t
1. From Part A, it can be established that increasing the concentration of OH - has no
significant effect on the rate of the reaction.
Rate k (s-1)
temp T (C)
temp T (K) 1/T (K-1)
Tuesday 3:30 Tutorials
Myotonic dystrophy was first diagnosed in 1909 by Hans Steinert at the medical
hospital of Leipzig University. The disorder has been named after him as
Stenierts disease (Steinberg and
The effect of 20 M Cytochalasin A on the growth of Neurospora crassa
Mon & Wed 10am
The objective of the experiment is to observe the growth rate of Neurospora
crassa under controlled conditions and afte
Neurospora crassa is a bread mold that is a commonly used model organism because it is
easily grown under lab conditions and can be easily observed under a light microscope.
Cythochalasin is an organic molecule that is also a fungal metabolit
The objective of the experiment is to observe the growth rate of N. crassa
under controlled conditions and after a treatment of 20M Cytochalasin A.
We also observed the position of the nucleus with respect to hyphal tip growth.
This is a graph that repres
Cytochalasin A is an actin filament inhibiter. It binds to the ends of actin filaments and
does not allow anything to attach or detach. Cytochalasin A does not allow the transport
of glucose across the plasma membrane because it deactivates glucose
Control Tips with Growth Medium
Treatment Tips with Growth Medium + 20M Cytochalasin A