Pre-Lab Assignment

1. A 0.1017 g sample of KBrO3 was dissolved in dilute acid and treated with an excess of KI. BrO3¯ + 9I¯ + 6H+ Br¯ + 3I3¯ + 3H2O The generated I3¯ required 27.39 mL of a Na2S2O3 solution to reduce it to I¯. Use the above equation and those found in the introduction to determine the molarity of the Na2S2O3 solution.

2. The following data was obtained for an iodometric titration of an ascorbic acid tablet.

Mass of tablet: 1.2381 g

Mass of sample analyzed: 0.2483 g

Vol. of 0.0166 mol•L-1 KIO3: 25.00 mL

Vol. of 0.0198 mol•L-1 Na2S2O3 to reach endpoint: 11.01 mL

Using the equations found in the introduction, determine: the mass of ascorbic acid in the sample analyzed and the mass of ascorbic acid contained within the tablet.

explain why all glassware must be dry and the solvent anhydrous during formation and reaction of a grignard reaction. Further, explain whether acetone would be a viable solvnt for a generation of a grignard reagent. include one or more balanced chemical equations in your answer.

Flame-retardant fabrics often have ________ atoms incorporated into the fabric's fibers.

a) N or Cl

b) N or O

c)Cl or Cr

d)Cl or Br

My alpha radiation source is polonium-210. When new, the activity of the source is 0.1 microcurie.

1.What is the half-life?

2.Calculate the decay constant.

3.What is the activity of the new source in bequerels?

4.How many ²¹⁰Po atoms are present in the source when it

2,4-Dichlorophenoxyacetic acid ("2,4-D") is a widely used herbicide with the molecular formula C8H6Cl2O3. The pKa of 2,4-D is 2.73. A certain water-based herbicide product contains 110 gL−1 of 2,4-D. What is the pH of the 2,4-D solution?

A)

Calculate the mass defect of the oxygen nucleus 16  8O. The mass of neutral 16  8O is equal to 15.994914 atomic mass units.

Express your answer in atomic mass units to four significant figures.

B)

Calculate the binding energy E of the oxygen nucleus 16  8O (1eV=1.602×10−19J).

Express your answer in millions of electron volts to four significant figures.

C)

Calculate the binding energy per nucleon of the oxygen nucleus 16  8O.

Express your answer in millions of electron volts to four significant figures.

D)

Calculate the mass defect of the helium nucleus 52He. The mass of neutral 52He is given by MHe=5.012225amu.

Express your answer in atomic mass units to four significant figures.

E)

Calculate the binding energy E of the helium nucleus 52He (1eV=1.602×10−19J).

Express your answer in millions of electron volts to four significant figures.

F)

Calculate the binding energy per nucleon of the helium nucleus 52He.

Express your answer in millions of electron volts to four significant figures.

1. Glycogen:

a.)  Is mainly broken down to glucose-1-P by glycogen synthase

b.)  Has branch chains that are attached at the branch points by alpha 1,4

glycosidic linkages

c.)  Built by glycogen phosphorylase when there is high ATP and high glucose-6-

P

d.)  Is an important storage form of glucose in our livers

e.)  Both a and c 

2. What effect will high fructose-2,6-bisphosphate and low ATP have on gluconeogenesis?

a.)  It will shut gluconeogenesis down at the step of triose phosphate isomerase

b.)  It will speed gluconeogenesis up at fructose-1,6-bisphosphate phosphatase

c.)  It will speed up gluconeogenesis by hyperactivating triose phosphate

isomerase

d.)  It will speed up gluconeogenesis by hyperactivating phosphofructokinase

e.)  Both b and d

1. The solubility product, K_sp, for aluminum hydroxide, Al(OH)₃, is 1.9 ✕ 10⁻³³ at 25°C. What is the molar solubility of aluminum hydroxide in a solution containing 0.066 M KOHat 25°C?

A solution is made by mixing 12.5 g of Sr(OH)2and 40.0 mL of 0.200 M HNO3.

a. Calculate the concentration of OH− ion remaining in solution.

b.Calculate the concentration of Sr2+ ion remaining in solution.

c.Calculate the concentration of NO−3 ion remaining in solution.

d. Is the resultant solution acidic or basic?

What is the difference between biochemical, pharmaceutical, and diagnostic chemical reactions in healthcare?

What is a specific example that exists for each of these chemical reaction types above and why might it be of importance to healthcare professionals?

List a balanced chemical equation for each of these chemical reaction types and explain how it is used in your example above.

i need references to APA format

Estimate the fugacity for each species in the following gases at 290 K and 800 bar:

(a) Pure oxygen;

(b) Pure nitrogen;

(c) Oxygen and nitrogen in a 30% mol O2 and 70% mol N2 mixture using the Lewis-Randall rule

(d) Oxygen and nitrogen mixture in part (c) using van der Waals equation of state.

From a molecular viewpoint, where does the energy absorbed in an endothermic chemical reaction go?

Complete the table using the following data:

IO₃^- (aq) + 6S₂O₃^2- (aq) + 6H₃O⁺ (aq) --> I^- (aq) + 3S₄O₆^2- (aq) + 9H₂O (l)

Express the concentration of a 0.0400M aqueous solution of fluride,F-, in mass percentage and in parts per million.Assume the density of the solution is 1.00f/mL.