Given the formula equation, write the complete ionic equation, net ionic equation, and identify the spectator ions for the following reaction: (NH4)2SO4 (aq) + 2 NaOH (aq) —> Na2SO4 (aq) + 2 H2O (l) + 2 NH3 (g)
In: Chemistry
Liquid octane (CH3(CH2)6CH3) will react with gasous oxygen (O2) to produce gasous carbon dioxide (CO2) and gasous water (H2O).
What is the theoretical yield of water formed from the reaction of 88.0 g of octane and 166.g of oxygen gas?
Be sure your answer has the correct number of significant digits in
it.
In: Chemistry
A weak acid was HA (pKa=5.00) was titrated with 1.00M KOH. The acid solution had a volume of 100ml and a molarity of 0.100M. Find the pH at the following volumes of base added Vb= 0, 1, 5, 9, 9.9, 10, 10.1 and 12.
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Distillation is a technique that is to purify liquid compounds. Explain how distillation is used to separate the target product from any residual unreacted starting material. [2.0 Marks]
Upon completion of the reaction (before filtration), an additional 4.0 mL of 1.0 M NaOH/EtOH was added to the reaction. What was the purpose of this step? Include a chemical reaction as part of your answer. [1 Mark]
The term “side reactions” refers to any chemical reaction that can occur that form products other than the desired product. Side reactions can consume the reactants of your intended reaction, and can affect the percent yield of your target product. Draw the full reaction mechanism for a possible side reaction that can occur under these reaction conditions. Include all charges and intermediates. Vaguely directed arrows will not receive marks. [2.0 Marks]
In: Chemistry
Determine the amount of heat produced if 100.00 grams of Cystein (C3H7NO2S) was burned in excess oxygen to produce carbon dioxide, water, and nitrogen gas. Include the molecular formula and balanced chemical equation for the combustion reaction in your answer.
In: Chemistry
Predict if the following reactions are spontaneous (e.g. using the Z method) and calculate E0, DG0 and K for each reaction
Reduction of H+ by Zn(s) (to form H2 and Zn2+)
Oxidation of Cu by Cl2(g) (to form Cu2+ and Cl-)
Oxidation of Cl- by F2(g) (to form Cl2 and F-)
Reduction of Cu2+ by Fe2+ (to form Cu(s) and Fe3+)
In: Chemistry
it appears more and more ceramic and metal objects are being replaced nowadays. These include : 1) household materials (some ceramic bath tubs or floors are replaced with polymer materials ) 2) metal pipes surrounding the house/ building become plastic pipes 3) even our lunch boxes nowdays are made of plastics instead of metal . list one advantage for using polymers but not ceramic/ metals in each of the above mentioned 3 cases and the cited polymer advantage in each case should be different.
In: Chemistry
Read the description and choose the term that matches from the options in the list.
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A proteinaceous biological catalyst is an: |
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A compound that is only extractable from biological material with a non polar solvent: |
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A chemical species that is electron rich and may donate a pair of electrons to form a new covalent bond: |
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The reaction of a compound with water: |
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A polyamide containing less than 50 amino acids is known as a: |
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A compound where an intramolecular reaction between an aldehyde and an alcohol can occur: |
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Base catalysed hydrolysis of esters may be described using this term: |
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A compound consisting of an organic base, sugar, and a phosphate section: |
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A reaction where two molecules combine and a small stable molecule is eliminated: |
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Compounds that consist of a carboxylic acid with a long hydrocarbon chain: |
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A chemical species that is electron deficient and may accept a pair of electrons to form a new covalent bond: |
Nucleotide, Hydrolysis, Lipid, Nucleophile, Enzyme, protein, Carbohydrate, nucleoside, Fatty acids, Saponification, Electrophile, peptide, Condensation reaction
In: Chemistry
30 grams of steam at 130C are colled to the boiling point, condensed, then cooled to 0C and frozen into ice. What is the total change in entropy of the water? what is the total change in gibbs energy? state any assumptions you are making.
In: Chemistry
The pKb values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.38. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.70 M B(aq) with 0.70 M HCl(aq).
(a) before addition of any HCl ____
(b) after addition of 25.0 mL of HCL ____
(c) after addition of 50.0 mL of HCl ____
(d) after addition of 75.0 mL of HCl ____
(e) after addition of 100.0 mL of HCl ____
In: Chemistry
A 25.0 mL aqueous solution contains 500.0 mg of a compound. Calculate the amount of solid extracted by diethyl ether from the solution by each of the following extraction procedures (assume a distribution coefficient (K) of 5.0 for each extraction):
a. A single 15.0 mL extraction with diethyl ether.
b. A single 150.0 mL extraction with diethyl ether.
c. Three sequential 5.0 mL extractions with diethyl ether.
show work please
In: Chemistry
You are interested in determining the heat of isomerization of two isomers (A and B), so you measure their heats of combustion. The difference between the heats of combustion is equal to the heat of isomerization. You are given two separate samples of (1.5 ± 0.1) mol for each isomer, A and B, and they are burned in a constant-pressure calorimeter.
The heat of capacity of the calorimeter is (8.44 ± 0.05) kJ K-1. Combustion of isomer A causes the temperature to rise by (2.0 ± 0.1) K, and isomer B causes the temperature to rise by (3.5 ± 0.1) K.
(a) Calculate the molar heat of isomerization (ΔHi = ΔHB - ΔHA)
(b) Calculate the uncertainty in the molar heat of isomerization. Assume that the errors in the moles of isomers A and B, heat capacity of the calorimeter, and temperature readings are small and independent.
In: Chemistry
What is the pressure (in millimeters of mercury) inside a container of gas connected to a mercury-filled open-end manometer of the sort shown in Figure 9.4 in the textbook when the level in the arm connected to the container is 18.0 cm lower than the level in the arm open to the atmosphere, and the atmospheric pressure reading outside the apparatus is 765.3 mm Hg ?
In: Chemistry
Find the pH of the following solution
10.0mL of solution A (which is .15 of .5M of acetic acid and .15 of .5M of sodium acetate) and 10.0mL of 0.1M of HNO3
10.0mL of solution A (same as above) and 10.0mL of 0.1M of NaOH
In: Chemistry