Organic Chemistry Questions

Describe the initiation step in the halogenation of alkanes. A. Radicals are consumed B. Radicals are formed C. Radicals are consumed and formed D. Ions are formed E. Ions are consumed

Based on the half reactions below, which of the following chemical species is the strongest oxidant? Co²⁺(aq) + 2e‾ -> Co(s) E⁰ = -0.28 V vs SHE Pb²⁺(aq) + 2e‾ -> Pb(s) E⁰ = -0.13 V vs SHE a. Pb²⁺(aq) b. Co(s) c. Co²⁺(aq) d. Pb(s)

Use the reaction below to answer the question. PCI5 (g) ⥨ PCl3 (g) + Cl₂(g) (△H=67kJ/mol) If the reaction is at equilibrium, and a scientist adds more Cl₂ to the reaction, what will happen? The amount of reactants will increase and the amount of products will decrease. All of these answers are correct. The reaction will shift left More PCl5 will be produced There will be less PCl3

An evacuated (i.e. empty) vessel is charged with 0.113M of HI (g). The following reaction proceeds to reach equilibrium. 2Hl (g) = H₂ (g) + l₂ (g) The equilibrium constant for this reaction at this temperature is Kc = 0.113. What is the concentration of hydrogen gas in this system at equilibrium?

What is the difference between sensation and perception? A. Perception refers to what goes on in the sensory organs and sensation is what happens in the brain. B. Sensation is the interpretation of sensory information and perception is the detection of sensory stimuli. C. Sensation is the detection of sensory stimuli and perception is the interpretation of sensory information. D. Nothing. They are the same thing.

A common vitamin needed for our health has the empirical formula C₃H₄O₃ and a molecular mass of 176 amu. What is the molecular formula? (A) C₃H₈O₃ (B) C₃H₄O₃ (C) C₆H₈O₆ (D) C₆H₁₂O₆

Consider the Lewis structure of the molecule NF3. Which of the following is true of the central atom nitrogen? It has 3 single bonds and 2 lone pairs. It has 3 single bonds and no lone pair. It has 3 single bonds and 1 lone pair. It has 1 double bond, 1 single bond and 1 lone pair.

3. The type of attractive force found in alkanes and cycloalkanes is hydrogen bonding. ----------------. 4. Since all alkanes are saturated hydrocarbons, all of the carbon atoms are aligned in one continuous chain. ------------------. 5. Isomers of alkanes can be created through rotation of the C-C and C-H bonds. ---------------.

What is the mass, in grams, of 4 moles of CO₂?

Calculate the number of moles present in 8.7 x 10²⁴ molecules of H₂O. [Hint: use dimensional analysis to solve!]

The mass of 1 mole of H2X is 34 grams. X must represent which element? (A) S (B) Cl (C) O (D) Kr

What is the volume, in Liters, of 0.55 moles of CO₂? [Hint: use dimensional analysis to solve!)

A stock solution was made by adding 200.0 g of CaCl₂ to 300.0 g of water. Next, a dilute solution is prepared by adding water to 16.50 mL of the stock solution to make the total mass of the solution equal to 98.00 g. What is the mass percent of CaCl₂ in the dilute solution?

A buffer solution is prepared with 0.371 M of benzoic acid , HC₇H₅O₂, and 0.186 M of sodium benzoate, NaC₇H₅O₂. For HC₇H₅O₂, Ka = 8.5 x 10‾⁵. What is the pH of this solution?

From experimental data, a student determined the concentration of acetic acid in vinegar to be 4.00%. If the true concentration of acetic acid is 8.00%, what is the percent error?

Which of the following statements is(are) true about gases? a. When the gas produced from the decomposition of H₂O₂ is added to BTB solution, the solution turns yellow. b. When one blows on limewater (Ca(OH)₂ solution), the solution turns cloudy. c. When the gas produced from the reaction of baking soda and vinegar is added to limewater, the solution turns cloudy. d. When a burning toothpick is brought close to a tube containing H₂, a small explosion or "popping" sound was produced.

Draw the Lewis structure for PCI3 and use your Lewis structure to answer the following: Number of electron groups around P: Electron domain geometry: Number of bonding groups around P: Number of lone pairs around P: Molecular geometry:

Use the reaction below to answer the following questions. Use the factor-label method shown in the notes. 2NaClO₃ --> 2NaCl + 3O₂ 1. If 12.0 grams of NaClO₃ are decomposed, how many grams of oxygen will form? 2. If 80.0 grams of oxygen (O₂) are produced, how many grams of NaCl must also have been produced?

The solubility of CuSO₄ is 21.0 g per 100 mL of water at 20°C. At the same temperature, a certain solution contains 215 g of CuSO₄ dissolved in 1.0 L of water. What kind of solution is this? a. unsaturated solution b. saturated solution c. ultra unsaturated solution d. supersaturated solution

If one blows onto a BTB solution, what do you expect to happen? A. The solution will turn yellow. B. A white precipitate will form. C. There will be no change or no reaction. D. The solution will burst into flame.

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Two D-aldopentoses give the same D-aldotetrose upon Ruff degradation. The two aldopentoses are____________. a. C2 epimers b. D-glucose and D-galactose c. Meso compounds d. Enantiomers e.C4 epimers

ZnSe crystallizes with the ZnS structure which is represented in the following model, with the anions in green. If the edge length of the unit cell is 567 pm, what is the density of crystalline ZnSe in g/cm³?

The reaction 3O₂(g) → 2O₃ (g) with a value of △H = -286 kJ _________. a. is endothermic and absorbs heat energy overall b. is exothermic and releases heat energy overall c. is spontaneous because energy is produced

What is the percent by mass of Nitrogen in NH₄NO₃?

Which of the following will INCREASE the rate of dissolving for a solid solute dissolved in a liquid solution? Choose all that apply Adding a catalyst Keeping the solute in large pieces Increasing the pressure Cooling the solutelsolvent Breaking up the solute into small pieces Stirring the solutelsolvent Heating up the solutelsolvent Putting the solute/solvent in the freezer

Calculate how many moles are in 168 grams of KOH. (The gram-formula mass of KOH is 56 g/mole.)(Hint: use dimensional analysis to solve!)

Which is the correct equilibrium constant expression for the following reaction? 2C(s) + O₂(g) ⇌ 2CO(g) a. [CO]²/[O₂] b. [CO]/[O₂] c. [CO]/[C][O₂] d. [CO] e. [CO]²/[C]²[O₂]

Which of the following is true about solubility? A. The solubility of most gas solutes decreases as the temperature of the solution decreases. B. The solubility of most solid solutes increases as the temperature of the solution decreases. C. The solubility of most gas solutes increases as the pressure increases. D. none of these

A compound has an empirical formula of CH2 and a molecular mass of 70 amu. What is the molecular formula of this compound? C5H10 C35H70 CH2 C5H5

Identify each of the following equations as a synthesis, decomposition, single, or double displacement, or combustion reaction. Write a balanced chemical equation for each and include all states of matter. a) zinc + hydrogen chloride -->zinc chloride + hydrogen b) aluminum + iron (III) oxide -->aluminum oxide + iron c) iron + sulphur --> iron (III) sulfide d) sodium chloride + silver sulfate --> sodium sulfate + silver chloride

Be sure to answer all parts. The equilibrium constant Kc for the reaction H₂(g) + CO₂(g) ⇌ H₂O(g) + CO(g) h 4.2 at 1650 C. Initially 0.73 mol H₂ and 0.73 mol CO₂ are injected into a 46-L, flask. Calculate the concentration of each species at equilibrium. Equilibrium concentration of H₂: Equilibrium concentration of CO₂: Equilibrium concentration of H₂O: Equilibrium concentration of CO:

What term describes the structural relationship between cis-1,2 dimethylcyclopentane and trans-1,2-dimethylcyclopentane? A) not isomers B) constitutional isomers C) enantiomers D) diastereomers E) conformers

A tetrapeptide is abbreviated as VIQN. Write the name of the amino acid at the N-terminal end. A tetrapeptide is abbreviated as FRWL. Write the name of the amino acid at the C-terminal end.

A 15.00 mL solution of H₂SO₄ was titrated with 1.75 M NaOH. If it took 22.50 mL of NaOH to reach the equivalence or stoichiometric point, what is the molarity of H₂SO₄ solution? H₂SO₄ and NaOH react according to the following equation. H₂SO₄ + 2 NaOH --> 2 H₂O + Na₂SO₄

2C₆H₁₂O + 17O₂ --> 12CO₂ + 12H₂O If cyclohexanol (C₆H₁₂O) is burned as a fuel in the following reaction, how many molecules of oxygen (O₂) are needed to produce 13.7 liters of carbon dioxide (CO₂)? _______________ x 1023 molecules O₂

A gas cylinder contains O₂, nitrogen (220 mm Hg) and CO₂ (82 mm Hg). The total pressure in the cylinder is 625 mm Hg. The partial pressure of oxygen in this mixture is __________. a. 323 mm Hg b. 82 mm Hg c. 302 mm Hg d. 625 mm Hg

Diagram the following redox reaction. Be sure to balance the reaction and identify which starting materials are the oxidizing agent and the reducing agent. How many electrons are transferred? _____O₂(g) + _______Fe(s) --> _______Fe₂O₃(s)

Your 150-lb friend wants to go for a walk in the snow. A. If she wears stylish shoes that contact the ground over a total of 9.32 in₂, how much pressure does she exert on the ground? B. If she wears snowshoes instead, that pressure changes to 1 psi. What must be the total surface area of the snowshoes?

Explain, using the structure of the valence electrons, why argon is less reactive than chlorine.

3. Iron (III) oxide, also known as rust can be removed from iron by reacting it with hydrochloric acid to produce iron (III) chloride and water. Fe203 (s) + 6HCI (aq) ---> 2FeCl3 + 3H₂0 (1) What mass of hydrogen chloride is required to react with 100 g of rust? a. 371g HCI b. 137g HCI c. 130g HCI d. 147g HCI

Calculate the number of grams of solid aluminium chloride that will form when a mixture containing 0.150 g of aluminum powder and 1.00 g of chlorine gas is allowed to react. 2AI (s) + 3Cl₂ (9) ---> 2AICI3 (s) a. 741 g AlCl3 b. 471 g AlCl3 c. 0.741 g AlCl3 d. 246 g AlCl3

A balloon with a volume of 5.0 L is filled with a gas at 2 atmospheres. If the pressure is reduced to 1 atmospheres without a change in temperature, what would be the volume of the balloon? a. 5.0 L b. 10 L c. 12 L d. 10 ml

What is the molecular formula of an organic compound with an empirical formula of CH3 and a molar mass of 30 g/mol? C₂H6 C3H6 CH2O CH4

What are the coefficients FeS + O₂ →→ __Fe₂O3 + __SO2 cannot be done 1, 3, 1.4 2, 3, 2, 4 4. 7. 2,4

Using the Ideal Gas Law (PV = nRT), calculate the grams of O₂ produced in the reaction. (Hint: solve for n, and then convert moles to grams. Don't forget to convert your temperature from Celsius to Kelvin.) Show your work.

Which of the following shows the correct number of atoms of each element in the formula Mg(NO3)2? 1 magnesium atom, 2 nitrogen atoms, 6 oxygen atoms 1 magnesium atom, 1 nitrogen atom, 5 oxygen atoms 1 magnesium atom, 2 nitrogen atoms, 5 oxygen atoms 2 magnesium atoms, 2 nitrogen atoms, 6 oxygen atoms

A mix of He, O2, H₂ and N₂ gases has a total pressure of 1127 mmHg. The He has a partial pressure of 622 mmHg. The O₂ has a partial pressure of 214 mmHg and the H₂ has a partial pressure of 147 mmHg. What is the partial pressure of the N₂ gas?

Atmospheric pressure depends on the altitude (or height) of your location. How should the air pressure change if you traveled from Los Angeles, California to Denver, Colorado, which is 1.5 kilometers (1 mile) above sea level?

Which of these represents the empirical formula and the molecular formula, respectively for a given compound? CH₂ and C₂H₂ CH3 and C3H12 C₂H3 and C6H₂ CH and CH4