General organic chemistry Questions and Answers

Which of the following reactive intermediate species maintains sp3 hybridization? A) methyl carbanion B) dibromocarbene C) tertiary carbocation D) secondary alkyl radical E) both B and C A) methyl carbanion C) tertiary carbocation D) secondary alkyl radical E) both B and C

A chemistry student weighs out 0.160 g of phosphoric acid (H3PO4), a triprotic acid, into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.0900M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Round your answer to 3 significant digits.

A). What is the hybridization of the central atom in AsF5? Hybridization= What are the approximate bond angles in this substance? Bond angles= B). What is the hybridization of the central atom in SF5CI? Hybridization= What are the approximate bond angles in this substance? Bond angles =

A. What is the hybridization of the central atom in SiH₄? Hybridization = What are the approximate bond angles in this substance? Bond angles = B. What is the hybridization of the central atom in CSe₂? Hybridization = What are the approximate bond angles in this substance? Bond angles =

Zinc metal will react with nitric acid vigorously. (hint for acid formula ic=ate) What mass of zinc metal will react completely with 40.0 mL of 0.200M Nitric Acid? 0.26 g 0.98 g 3.1 g 1.2 g

Name the compound with the condensed structural formula CH₃CH₂CH₂CHO? (A) 1-propanol (B) 1-butanol (C) propanal (D) butanal

Molecules of 2-methyl butane and 2,2-dimethyl propane have different molecular formulas number of covalent bonds number of carbon atoms structural formulas

When we write an equation showing all of the ions from the dissociated substances, we call it the: (A) complete molecular equation (B) net ionic equation (C) complete ionic equation (D) spectator ion equation

What is the strongest intermolecular force present in a pure sample of N₂? (A) dipole-dipole forces (B) no intermolecular forces in this substanceno intermolecular forces in this substance (C) hydrogen bonding (D) dispersion forces

Find the amount of heat (Q) needed to raise the temperature of 5.00 g of a substance from 20.0 °C to 30.0 °C if the specific heat of the substance is 2.01 J/g ºC.

In saturated hydrocarbons, carbon atoms are bonded to each other by (1) alternating double and triple bonds (2) alternating single and double bonds (3)double bonds (4) triple bonds (5) single bonds

Complete and balance the following half-reaction in acidic solution. Be sure to include the proper phases for all species within the reaction. NH3(g) → NO3- (aq)

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4NH₃(g) +7O₂(g) → 4NO₂(8) + 6H₂O(g) The combustion of 65.0 g of ammonia consumes___________g of oxygen.

Write the equation for Keg for the following as a homogeneous equilibrium (only the aqueous phase) CaCO3(s) +2 HF(aq.) <-> CaF2(aq.) + H₂O(liq.) + CO₂(aq.) K eq.= The concentration of HF is squared because its coefficient is 2

A negative heat of reaction indicates which of the following? A. Endothermic reaction B. Exothermic reaction C. Exothermic and endothermic both D. Neither exothermic nor endothermic E. None of above

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

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. ---------------.

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.

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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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?

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]

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

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:

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

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.

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

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

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?

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

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. Therefore, how much oxygen was used in this reaction if the following data was collected? 2Mg + O₂--> 2MgO 2.50 g Mg 4.15 g MgO 2.50 g 6.65 g O5.80 g 1.65 g

One of the main assumptions of the kinetic molecular theory of gases is that the particles of an ideal gas-- are in constant motion must be highly chemically reactive must be maintained at very high pressures must be single atoms instead of molecules

V1/T1=V2/T2 P1V1= P2V2 PV=nRT You can apply any of the formulas above to solve the problem. A gas sample at 85°C occupies a volume of 14 L. At what temperature will it occupy 12 L? * 140°C 73°C 34°C 420°C

A block of tin metal has a volume of 4.88 L and a mass of 35.7 kg. Express your answer to three significant figures and include the appropriate units.

You can infer that, as the second march moved toward Montgomery. A. the marchers were attacked many times B. the marchers got caught in the rain C. thousands of people joined the crowd D. many marchers were arrested

2Na+2H₂-->2NaOH + H₂ How many moles of hydrogen gas are produced when 0.0132 moles of sodium is completely reacted? 0.0066 mol H₂ 0.0099 mol H₂ 0.0033 mol H₂ 0.0132 mol H₂

Calculate the number of moles of nitrogen in a steel tank with a volume of 9.583 L under a pressure of 4.972 atm and 31.8°C.

AlCl3 + AgNO3 →Al3NO3 +AgCl If 30.7 g of aluminum chloride is reacted with 90.5 g of silver nitrate, which reactant is limiting and which is excess? What mass of the excess reactant is used in the reaction, and what mass of the excess reactant remains after the reaction? What is the percent yield if the 65 g of silver chloride was produced in the lab.

Why does the pressure inside a container of gas increase if more gas is added to the container? There is an decrease in the temperature of the gas. There is an increase in the force of the collisions between the particles and the walls of the container. There is an increase in the volume of the container. There is an increase in the number of collisions between the particles and the walls of the container.

Scott is conducting a lab experiment when his lab partner's shirt catches on fire! Scott, knowing his safety procedures, quickly grabs the fire blanket and wraps his partner up in the blanket so that the fire goes out. What is the EXCESS reactant in this situation? oxygen the fire Scott's lab partner's shirt the blanket

What is the molarity of a solution in which 45 g of aluminum bromide (AlBr3) is dissolved in 150 mL of water? 0.0011 M 3.33 M 1.12 M 0.30 M