12.0 L container of sulfur dioxide has a pressure of 285 Torr T -110oC. What mass of SO2 is present?

Which of the following compounds would produce a negative test for chromicacidand a positive test for 2,4-dinitrophenylhydrazine, be soluble in sulfuric acidand be insoluble in sodium bicarbonate: methyl m-nitrobenzoate, 2-pentanone, or 1-octanol? 


Draw (1S,3S)-3-methylcyclopentanol and explain your reasoning.

1. Propose a method to test the antioxidant activity (DPPH Scavenging method) of organic compounds. Write a detailed report about the protocol. Write the purpose, materials, calculations, methods, etc.

Acetic acid has a normal boiling point of 118 ∘C and a ΔHvap of 23.4 kJ/mol.What is the vapor pressure (in mmHg) of acetic acid at 40 ∘C?

how do you find bond angle measurement with a line bond structures

One mole of an ideal gas at 1.00 atm and 298K with C_{p,m=3.5R is put through the}

following cycle: a) (reversible) constant volume heating to twice its initial

temperature; b) reversible, adiabatic expansion back to its initial temperature;

c) reversible isothermal compression back to 1.00 atm. Calculate ΔS for each step and

overall. d) What is the change of entropy of the surroundings?

A chemistry graduate student is given 100.mL of a 1.50M diethylamine C2H52NH solution. Diethylamine is a weak base with =Kb×1.310−3. What mass of C2H52NH2Cl should the student dissolve in the C2H52NH solution to turn it into a buffer with pH =11.35? You may assume that the volume of the solution doesn't change when the C2H52NH2Cl is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

A. Which of the following can behave as Bronsted-Lowry bases in aqueous solution?

NO₃^-

H₃PO₄

NH₄⁺

HClO

None of the Above

B. Which of the following can behave as Bronsted-Lowry bases in aqueous solution?

NH₄⁺

NH₃

Ca(OH)₂

Br^-

None of the Above

C. Which of the following can behave as Bronsted-Lowry bases in aqueous solution?

HCO₃^-

NaOH

KOH

HF

None of the Above

* please help me I am really struggling with this concept. I fully cannot seem to grasp it and really need to understand it*

Find the pH of each of the following solutions of mixtures of acids.

a) 0.120 MM in HBrHBr and 0.135 MM in HCHO2HCHO2

Express your answer to three decimal places.

b) 0.155 MM in HNO2HNO2 and 9.0×10⁻² MM in HNO3HNO3

Express your answer to two decimal places.

c) 0.185 MM in HCHO2HCHO2 and 0.22 MM in HC2H3O2HC2H3O2

Express your answer to two decimal places.

d) 4.5×10⁻² MM in acetic acid and 4.5×10⁻² MM in hydrocyanic acid

Express your answer to two decimal places.

Osmium (76Os) has seven naturally occurring isotopes, six of which are stable. Osmium 193 is a beta-emitter. A sample of 193Os with mass of 58.36 μg emits 13.52×108 β

particles in a time interval of 32 min. What is the half-life (in years) of this nuclide?

1. What normally happens when iodine is added to starch?

2.Tube 2 contained starch at the beginning of the experiment. How do you explain the reaction with iodine at the end of the experiment?

3. What food substance is tested by using Benedict's solution?

Determine the pH?

1)   0.18M KCHO2

2)   0.15M CH3NH3I

3)   0.19M KI

thanks

Rather than titrating the active ingredient in an antacid directly with a standard solution of a strong acid in our buret, in this experiement we first dissolve the antacid tablet in a measured excess of standard acid, and then titrate (with standard sodium hydroxide solution) the portion of the acid that was not consumed by the tablet. Explain.

Organic Structures Shapes and Isomerism

Hands-On Labs, Inc.
Version 42-0183-00-02

Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

Exercise 1: Organic Structures Shapes and Isomerism

Data Table 1. The Tetrahedral Carbon Atom.

Data Table 2. Alkanes and Alkyl Groups.

Data Table 3. Isomers.

INSERT A PICTURE OF YOUR BUTANE ISOMERS.

Data Table 4. Cycloalkanes.

Questions

Part A

What is the difference in the number of carbon atoms between methane and ethane and between ethane and propane?

Part B

What is the difference in the number of hydrogen atoms between methane and ethane and between ethane and propane?

Part C

What is the formula for a 6 carbon alkane?