Chemistry concepts and calculations

1. What class of molecules is responsible for most of the reducing power in natu

1. What class of molecules is responsible for most of the reducing power in natural waters? What parameter is a measure of that reducing power? 2. Five hundred kg of n-propanol (C…

1. What class of reaction occurs when you add Na2HPO4 to a mixture of Fe(NO3)3 a

1. What class of reaction occurs when you add Na2HPO4 to a mixture of Fe(NO3)3 and NH4SCN? What is the net ionic equation of the chemical reaction that causes the equilibrium shif…

1. What colour is a reaction mixture that contains only dichromate ions? When us

1.What colour is a reaction mixture that contains only dichromate ions? When using a volumetric or transfer pipette, the drop that remains in the tip after draining should not be …

1. What commands would return all the rows and columns in the ProductCategory ta

1. What commands would return all the rows and columns in the ProductCategory table?     2. What commands would you type and execute to return only the ProductSubcategoryID, Produ…

1. What conclusion we can reach based on phenolphthalein test on saponification.

1. What conclusion we can reach based on phenolphthalein test  on saponification.? 2. After adding the CaCl2  the  solution turned the water " hard". What effect did this have on …

1. What could this picture represent? (A) pure element (B) homogeneous mixture (

1. What could this picture represent? (A) pure element (B) homogeneous mixture (C) pure compound (D) heterogeneous mixture 2. What is the formula for a molecule of hydrogen? (A) H…

1. What could you do to lower the errors for recrystallization? 2. What could yo

1. What could you do to lower the errors for recrystallization? 2. What could you do to lower the errors for column chromatography? 3. Which technique, recrystalization or column …

1. What determines a good nucleophile for S N 2? a) Consider the role that elect

1. What determines a good nucleophile for SN2? a) Consider the role that electron density plays in the strength of a nucleophile. b) Consider the attacking ability purely through …

1. What do we look for in an IR spectrum? 2. As wavenumber increases, wavelength

1. What do we look for in an IR spectrum? 2. As wavenumber increases, wavelength ____________________, frequency _____________________ and energy _______________________. 3. What …

1. What do you feel is the largest source of experimental error in your determin

1. What do you feel is the largest source of experimental error in your determination of R? 2. What would be the effect (increase, decrease, or no change) on the calculated value …

1. What does a chemical equation tell us about a reaction. 2. What\'s the differ

1. What does a chemical equation tell us about a reaction. 2. What's the difference between a qualitative and quantitative observation 3. How do we indicate the physical state of …

1. What does a molecule need to have to be considered chiral? (8 points) 2. Whic

1. What does a molecule need to have to be considered chiral? (8 points) 2. Which of the following molecules could be chiral? (8 points) OH CI H2 The specific rotation of [Rt] cam…

1. What does a molecule need to have to be considered chiral? (8 points) 2. Whic

1. What does a molecule need to have to be considered chiral? (8 points) 2. Which of the following molecules could be chiral? (8 points) OH CI H2 The specific rotation of [Rt] cam…

1. What does an increase in temperature do to the spontaneity of this reaction?

1. What does an increase in temperature do to the spontaneity of this reaction? Explain your reasoning.Use the following data to answer questions 1 through 3. All data is tabulate…

1. What does it mean for an app to be platform independent? A. The app was creat

1. What does it mean for an app to be platform independent? A. The app was created by independent vendors but operates exactly the same way across platforms. B. The app can be run…

1. What effect does doubling [ S2Os^2-] have on the rate? By what factor (experi

1. What effect does doubling [ S2Os^2-] have on the rate? By what factor (experimental, not rounded to a whole number) does the rate increase? Hint: Rate 2 / Rate 1 = 1 ? The rate…

1. What effect does the presence of metal cations have on the color of a solutio

1. What effect does the presence of metal cations have on the color of a solution containing EBT at pH 10 2. What effect does the presence of metal cations have on the color of so…

1. What effect would each of the following have on the success of the recrystall

1.         What effect would each of the following have on the success of the recrystallization of benzoic acid from hexane?             a.         The hot solution of the benzoic…

1. What effect would the following errors have on the calculated value of Ka? Ch

1. What effect would the following errors have on the calculated value of Ka? Choose whether the calculated value would be too high, too low, or if there is no effect. Explain you…

1. What effect would the following errors have on the calculated value of Ka? Ch

1. What effect would the following errors have on the calculated value of Ka? Choose whether the calculated value would be too high, too low, or if there is no effect. Explain you…

1. What factors influence reaction rates? Check all that apply. volume 2. Which

1. What factors influence reaction rates? Check all that apply. volume 2. Which of the following scenarios would lead to the greatest increase in rate of reaction? 3. What is the …

1. What four wrong procedures will cause a false melting point? 2. What are acti

1. What four wrong procedures will cause a false melting point? 2. What are activated carbons used for, and what happens if to much is used? 3. GC: which type of compounds will ha…

1. What half-reaction will occur at the anode in the electrolysis of an aqueous

1. What half-reaction will occur at the anode in the electrolysis of an aqueous solution of iron (II) perchlorate (Fe(ClO4)2)? (The electrodes themselves are platinum.) the table …

1. What happened when you added test solution to the test tube filled with only

1.What happened when you added test solution to the test tube filled with only copper sulfate solution? 2. What happened when you added test solution to the test tube filled with …

1. What happens to the rotaional energy of the particle if the value of J is inc

1. What happens to the rotaional energy of the particle if the value of J is increased (holding r and u constant) 2. What happens to the rotational energy of the particle if the m…

1. What happens when a carboxylic acid is added to water? A. a carboxylate ion a

1. What happens when a carboxylic acid is added to water? A.a carboxylate ion and a hydroxide ion are formed B.an alcohol is formed C.a carboxylate ion and hydronium ion are forme…

1. What happens when a carboxylic acid is added to water? A. a carboxylate ion a

1. What happens when a carboxylic acid is added to water? A.a carboxylate ion and a hydroxide ion are formed B.an alcohol is formed C.a carboxylate ion and hydronium ion are forme…

1. What happens when an nuclei with a spin number of ½ is subjected to an applie

1. What happens when an nuclei with a spin number of ½ is subjected to an applied magnetic field? 2. Recalling that we can have spin up and spin down orientations; what does this …

1. What hazards and safety precautions should be employed in handling the follow

1. What hazards and safety precautions should be employed in handling the following chemicals: Hydrogen Peroxide (50%)- para-Toluenesulfonic acid- Formic Acid- Ethyl Acetate- Brom…

1. What ions are present in solution upon dissolving each of the following subst

1. What ions are present in solution upon dissolving each of the following substances in water; a. HNO3 b.(NH4)2SO4 2. Indicate which element is oxidized and which is reduced in t…

1. What ions have a larger radius than their parent atom? 2. What is the effect

1.  What ions have a larger radius than their parent atom? 2.  What is the effect on atomic properties of increasing nuclear charge? 3.  What are the following trends in the Perio…

1. What is Microwave Chemistry? 2. What is Green Chemistry? Write at least five

1. What is Microwave Chemistry? 2. What is Green Chemistry? Write at least five principles of Green Chemistry pertaining to the reaction you are planning to conduct in a microwae …

1. What is a buffered solution? 2. Write a NET IONIC equation to show the reacti

1. What is a buffered solution? 2. Write a NET IONIC equation to show the reaction of HCl with a 3-1 buffer of Acetate to Acetic Acid, Write a similar equation for the reaction of…

1. What is a characteristic of an organic molecule? Contain C atoms. Have charge

1. What is a characteristic of an organic molecule? Contain C atoms. Have charges. Do not contain C. Are always found as ring structures. 2. Molecules that only consist of hydroge…

1. What is a quadruple bond? How can it be explained using d orbital overlaps? A

1. What is a quadruple bond? How can it be explained using d orbital overlaps? Attempt to gure draw a 3-D rendering of the d-orbitals overlapping to form the dimetallic complex in…

1. What is an \"off-by-one error\"? Give an example for it from your experience.

1. What is an "off-by-one error"? Give an example for it from your experience. 2. What will the output of the following statements? ArrayList<String> names = new ArrayList&l…

1. What is an acid? 2. Explain the difference between a strong acid and a weak a

1. What is an acid? 2. Explain the difference between a strong acid and a weak acid. Match the words in the left column to the appropriate blanks in the sentences on the right. Ma…

1. What is an alchemist? 2. What idea did Paracelsus propose, about what actuall

1. What is an alchemist? 2. What idea did Paracelsus propose, about what actually composed the world? 3. In his pursuit of finding gold in the human body, what substance did Henni…

1. What is an azeotrope? 2. What is the purpose of adding 10% sodium carbonate s

1. What is an azeotrope? 2. What is the purpose of adding 10% sodium carbonate solution to the distillate if it is acidic to litmus? 3. During a steam distillation, how can you te…

1. What is an azeotrope? 2. What is the purpose of adding 10% sodium carbonate s

1. What is an azeotrope? 2. What is the purpose of adding 10% sodium carbonate solution to the distillate if it is acidic to litmus? 3. During a steam distillation, how can you te…

1. What is an ion? (2 points) 2. What are valence electrons? (2 points) 3. Write

1. What is an ion? (2 points) 2. What are valence electrons? (2 points) 3. Write the Lewis dot structure for an aluminum (Al) atom. Circle the valence electrons. (2 pt) 4. What is…

1. What is groundwater? A) Natural waters that have low concentrations of dissol

1. What is groundwater? A) Natural waters that have low concentrations of dissolved salts and solids. B) Water that is incorporated in the crystalline structure of the soil minera…

1. What is happening at the cathode of an operating electrochemical cell and wha

1. What is happening at the cathode of an operating electrochemical cell and what sign is traditionally given to this electrode? What color wire is traditionally used to connect t…

1. What is meant by hard water, what ions are responsible for making water hard?

1. What is meant by hard water, what ions are responsible for making water hard? 2. What is the purpose of adding 3 drops of potassium chromate to water sample before titration? 1…

1. What is meant by the term Colligative Properties 2. Name and descried the fou

1. What is meant by the term Colligative Properties 2. Name and descried the four Colligative Properties: oncentration Based on Mass (massvolume percent). N(m/v) grams of solute X…

1. What is meant by the term oxidation? a. The loss of electrons by the compound

1. What is meant by the term oxidation? a. The loss of electrons by the compounds in chemical reactions. b. The gain of electrons by the compounds in chemical reactions. c. The co…

1. What is meant by the term oxidation? a. The loss of electrons by the compound

1. What is meant by the term oxidation? a. The loss of electrons by the compounds in chemical reactions. b. The gain of electrons by the compounds in chemical reactions. c. The co…

1. What is meant by the term reduction ? The gain of electrons by the compounds

1. What is meant by the termreduction? The gain of electrons by the compounds in chemical reactions. The loss of electrons by the compounds in chemical reactions. 2.On which side …

1. What is meant by the term reduction ? The gain of electrons by the compounds

1. What is meant by the termreduction? The gain of electrons by the compounds in chemical reactions. The loss of electrons by the compounds in chemical reactions. 2.On which side …

1. What is oxone? 2. When preforming a chemical test to check that the oxidant w

1. What is oxone? 2. When preforming a chemical test to check that the oxidant was fully quenched, we used potassium iodide and two drops of acetic acid mix with the aqueous layer…