Homework Answers
The composition of a substance does not changes when a substance boils which means when a substance change from one phase of matter to another phase of a matter, the substance remains the same.
Hence, when hexane boils, it remains hexane only i.e. C6H14.
Answer = option (A) ONLY C6H14
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What chemical substances can be found in the bubbles formed when hexane boils? O A Only...
What intermolecular attractions will be formed when the following substances condense from the gas phase? X...
What intermolecular attractions will be formed when the following substances condense from the gas phase? X Incorrect. Is this molecule polar or capable of hydrogen bonding? Recall that London forces occur between all molecules. (a) hexane (CH34) hydrogen bonding lonic bonding dipole-dipole London forces x Incorrect. Is the oxygen bound to an H, or is this an ether, which cannot hydrogen bond? Recall that all molecules will have London forces. (b) acetone (HACCOCH) London forces hydrogen bonding dipole-dipole (c) jodine,...
Liquid water at room temperature is placed in a syringe, which is then sealed. The plunger of the syringe is drawn back, and at some point bubbles of H2 O vapor are formed. Explain why we can state th...
Liquid water at room temperature is placed in a syringe, which is then sealed. The plunger of the syringe is drawn back, and at some point bubbles of H2 O vapor are formed. Explain why we can state that the water is boiling.
4) For which of the folling pure chemical substances will sº = 0.0 J/mol.K when T...
4) For which of the folling pure chemical substances will sº = 0.0 J/mol.K when T = 25.0°C? a) FeCl(s) b) O2(g) c) O3(g) d) Both b and c e) None of the above b) AS 5) For a particular chemical reaction it is found that the value for the equilibrium constant for the reaction decreases as temperature increases. Based on this we can conclude a) AS rxn <0 0 c) AHºrx<0 d) AHºrx>0 <0 e) AGºran
In a chemical reaction, the reactant that limits the amount of product that can be formed...
In a chemical reaction, the reactant that limits the amount of product that can be formed is called the limiting reactant (or limiting reagent). The reaction will stop when all of the limiting reactant is consumed. In the sandwich example, bread was our limiting reactant. The reactant or reactants in a chemical reaction that remain when a reaction stops when the limiting reactant is completely consumed are called the excess reactant(s). The excess reactant(s) remain because there is nothing with...
answer 2,3,4 only Substances A, B, and C can all act as oxidizing agents. In solution...
answer 2,3,4 only Substances A, B, and C can all act as oxidizing agents. In solution the neutral substance A is green, B is yellow and C is red. In reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are colorless. When a solution of A is mixed with one containing C- ions, the color changes from green to red. Write a chemical reaction for this process. Use the reactions on Page...
Chemical Change and Chemical Equations Name G No. Pre-lab Questions: Classify each of the following changes...
Chemical Change and Chemical Equations Name G No. Pre-lab Questions: Classify each of the following changes as physical or chemical and, in the cases of a chemical change, describe one observation that indicates new substances have been formed 1. a. Milk sours b. A wet handkerchief dries c. Fruit ripens d. A stick of Dynamite explodes Air is compressed into a steel container f. Water boils g. A baking cake burns h. A silver tray tarnishes i. On a hot...
15. An unknown compound has a chemical formula of C,H,O. When chromic acid (containing chromate ions)...
15. An unknown compound has a chemical formula of C,H,O. When chromic acid (containing chromate ions) was added to the unknown, the solution remained orange. The unknown was soluble in water. When NaOH and Kl/iodine were added to the unknown, a yellow precipitate formed. What is the structure of the unknown compound? 16. Would you expect 2-octanone to be soluble in water? Would you expect butanal to be soluble in water? Would either of them be more soluble in hexane...
Name CHM121 E14 CLASSIFICATION OF CHEMICAL SUBSTANCES If substances are only classified as ionic, macromolecular, metallic,...
Name CHM121 E14 CLASSIFICATION OF CHEMICAL SUBSTANCES If substances are only classified as ionic, macromolecular, metallic, and molecular, in which, IF ANY, categories are ALL the members: 2) a) Soluble in water b) Electrical conductors when melted c) Insoluble in all common solvents d) Solids at room temperature Classify each substance below into one of the following seven categories: ionic, ionic with waters of hydration, ionic-molecular, ionic-molecular with 3) a) A white solid melts at 250°C without decomposing. The liquid...
4) For which of the folling pure chemical substances will SⓇ = 0.0 J/mol K when...
4) For which of the folling pure chemical substances will SⓇ = 0.0 J/mol K when T = 25.0°C? a) O2(g) b) Os(g) c) FeCl(s) d) Both a and e) None of the above 5) For a particular chemical reaction it is found that the value for the equilibrium constant for the reaction decreases as temperature increases. Based on this we can conclude a) AH 0 b) AH > 0 c) AS0 d) AS rx > 0 e) AGºrx <...
the enthalpy change in a chemical reaction can be determined using bond energies. energy must be...
the enthalpy change in a chemical reaction can be determined using bond energies. energy must be added or absorbed to break bonds and that energy is released when bonds are formed. therefore ,you can calculate the total enthalpy of the reaction using following formula: dH= bonds broken-bonds formed Using bond energies, calculate the change in energy that accompanies the following reaction: H2 + O2 -> 2H2O Bond Bond Energy H-H 432 kJ/mol O-O 498 kJ/mol H-O 467 kJ/mol
What intermolecular attractions will be formed when the following substances condense from the gas phase? X Incorrect. Is this molecule polar or capable of hydrogen bonding? Recall that London forces occur between all molecules. (a) hexane (CH34) hydrogen bonding lonic bonding dipole-dipole London forces x Incorrect. Is the oxygen bound to an H, or is this an ether, which cannot hydrogen bond? Recall that all molecules will have London forces. (b) acetone (HACCOCH) London forces hydrogen bonding dipole-dipole (c) jodine,...
4) For which of the folling pure chemical substances will sº = 0.0 J/mol.K when T = 25.0°C? a) FeCl(s) b) O2(g) c) O3(g) d) Both b and c e) None of the above b) AS 5) For a particular chemical reaction it is found that the value for the equilibrium constant for the reaction decreases as temperature increases. Based on this we can conclude a) AS rxn <0 0 c) AHºrx<0 d) AHºrx>0 <0 e) AGºran
In a chemical reaction, the reactant that limits the amount of product that can be formed is called the limiting reactant (or limiting reagent). The reaction will stop when all of the limiting reactant is consumed. In the sandwich example, bread was our limiting reactant. The reactant or reactants in a chemical reaction that remain when a reaction stops when the limiting reactant is completely consumed are called the excess reactant(s). The excess reactant(s) remain because there is nothing with...
Chemical Change and Chemical Equations Name G No. Pre-lab Questions: Classify each of the following changes as physical or chemical and, in the cases of a chemical change, describe one observation that indicates new substances have been formed 1. a. Milk sours b. A wet handkerchief dries c. Fruit ripens d. A stick of Dynamite explodes Air is compressed into a steel container f. Water boils g. A baking cake burns h. A silver tray tarnishes i. On a hot...
15. An unknown compound has a chemical formula of C,H,O. When chromic acid (containing chromate ions) was added to the unknown, the solution remained orange. The unknown was soluble in water. When NaOH and Kl/iodine were added to the unknown, a yellow precipitate formed. What is the structure of the unknown compound? 16. Would you expect 2-octanone to be soluble in water? Would you expect butanal to be soluble in water? Would either of them be more soluble in hexane...
Name CHM121 E14 CLASSIFICATION OF CHEMICAL SUBSTANCES If substances are only classified as ionic, macromolecular, metallic, and molecular, in which, IF ANY, categories are ALL the members: 2) a) Soluble in water b) Electrical conductors when melted c) Insoluble in all common solvents d) Solids at room temperature Classify each substance below into one of the following seven categories: ionic, ionic with waters of hydration, ionic-molecular, ionic-molecular with 3) a) A white solid melts at 250°C without decomposing. The liquid...
4) For which of the folling pure chemical substances will SⓇ = 0.0 J/mol K when T = 25.0°C? a) O2(g) b) Os(g) c) FeCl(s) d) Both a and e) None of the above 5) For a particular chemical reaction it is found that the value for the equilibrium constant for the reaction decreases as temperature increases. Based on this we can conclude a) AH 0 b) AH > 0 c) AS0 d) AS rx > 0 e) AGºrx <...
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