General organic chemistry Questions and Answers

A sample of three mixed gases is at 632.0 mmHg: CO2, N₂ and O2. The partial pressure of the N₂ is 75% of the total pressure. What is the partial pressure of the N₂? 557 mmHg 600 mmHg 474 mmHg 158 mmHg

Balance the following neutralization reactions and use it to solve the next 3 problems below. ingrese su respuesta... AI(OH)3 + ingrese su respuesta... H₂O ingrese su respuesta... H₂SO4 --> ingrese su respuesta... Al₂(SO4)3 +

When a substance dissolves in a solvent it forms a compound suspension solution element

You and your friends decide to have a big party in your chemistry lab to celebrate the end of the schoo year. For fun, you decide to use beakers instead of cups for the drinks at the party. However, not all o the chemicals from your last experiment were properly put away and a beaker of hydrochloric acid (HCI) was lying around. Your classmate at the party accidentally drinks the whole glass of hydrochloric acid and is now choking. Nevertheless, being the amazing chemist that you are, you know that if you give your classmate baking soda, which is sodium bicarbonate (NaHCO3,a base), you can neutralize the acid and save your friends life. So, if your friend drank 50g of hydrochloric acid, how many grams of baking soda do you need to completely neutralize the acid and save your friend? NaHCO3 + HCI → H₂O + CO₂ + NaCl

What mass of silver acetate (AgC₂H3O2) do you need to make 2.70 L of a 3.50 M solution? 167 g 1577 g 584 g 451 g

A 0.95 L of a barium bromide solution (BaBr₂) contains 0.55 moles of the solute. What is the molarity of the solution? 1.95 x 10-³ M 1.33 M 1.73 M 0.58 M

What is the pH of a substance with a hydrogen concentration of 1.0 x 10^-11? Your Answer:. Answer

According to the following balanced equation, approximately how many moles of hydrochloric acid (HCI) would be necessary to produce 18 grams of water? 16 HCI + 2 KMnO4 --> 2 KCI + 2 MnCl₂ + 5 Cl2 + 8 H₂O

A balloon has a volume of 2.5 liters while under 101.3 kPa at a temperature of 15 °C. If the balloon is released and rises to a height where the pressure drops to 75 kPa and the temperature drops to -5 °C, what will its new volume be?

a. NaSO³(H₂O)10 9. Na(SO4)2101120 What is the correct name for N₂O4? C. Na₂SO4 10 1120 d. Na2SO4 2 1120 a. nitrogen (IV) tetroxide b. nitrogen(II) oxide c. dinitrogen oxide d. dinitrogen tetroxid What is the name of HIO3(aq)?

In the following reaction, 2H₂ (g) + O₂ (g) - 2 H₂O (g), how many moles of oxygen (0₂) would be required to react with 10.0 moles of hydrogen (H₂)? Round your answer to 1 decimal place.

Copper reacts with nitric acid according to the following reaction: Cu (s) + 4 HNO3(aq) → Cu(NO3)2 (aq) + NO₂ (aq) + H₂O Calculate the volume, in mL, of 3.00 M nitric acid required to react with 33.0 g of copper.

How many moles of AI(NO3)3 are produced when 39.61 grams of HNO3 are reacted with excess Al(OH)3? Round your answer to three digits after the decimal point. Al(OH)3 + 3 HNO3 → AI(NO3)3 + 3 H₂O

2SO₂ (g) + O₂ (g) = 2SO, (g) a. Draw the best Lewis Structure of the product that is produced from this reaction. b. Identify the molecular geometry (shape) of the product that is produced from this reaction. c. Identify the hybridization of the central atom(s) of the product that is produced from this reaction.

A student calculated the molarity of a solution prepared by dissolving 0.643 mol of table salt (sodium chloride, NaCl) in 2.5 x10^3 mL of water.

The pressure of a sample of hellum in a 1.00 L container is 0.988 atm. What is the new pressure if the sample is placed in a 2.00 L container. a. 0.398 atm b. 0.416 atm c. 0.532 atm d. 0.494 atm

The student then takes a 2.50 M stock solution of table salt (table salt, NaCl) and mixes 0.946 L of stock solution with additional distilled water to create a dilute solution with a total volume of 3.15 L. Explain how the student can determine the molarity of the resulting solution. Show a valid calculation for the final molarity.

A 102.5 gram gold bar was heated in an experiment and 3,900 J of energy was transferred to the bar. What was the change in temperature for the bar in °C? Specific Heat: (CGold =0.126 J/g°C)

A party balloon is filled with helium. The starting volume of the balloon is 6.7L and the pressure of the helium is 2.8 atm. If the balloon is compressed, reducing the volume to 3.5L, what is the new pressure?

The attached picture shows a model of two solutions, NaOH(aq) and a mystery solution. After they are mixed together, a precipitate is formed. Which of the solutions below is a possible identity of the mystery solution? A. CaCl₂(aq) B. FeSO4(aq) C. KBr(aq) D. LINO3(aq)

Which of the following represents an endothermic reaction? 2SO2 (g) → 25 (s) + 202 (g) + 376kJ 2H₂O(g) + 572 kJ → 2H₂ (g) + O₂ (g) 2C₂H6 (g) + 702 (g) - 4CO₂ (g) + 6H₂O(g) + 3120 kJ CH4 (g) +202 (g) - CO₂ (g) + 2H₂(g) + 890 kJ

A student drew the following concept map about matter. A different student was asked to critique the concept map. What would the best critique statement of this concept map? The word "matter" should be switched with the word "mixture on the map. The words "homogeneous" and "heterogeneous" should both be placed under the heading "mixture." The words "homogeneous" and "heterogeneous" should both be placed under the heading "pure substance." Heterogeneous should be followed by the word "mixture": homogeneous should be followed by the word "substance."

Anna was asked to identify and explain if the equation CO2 (g) - CO2 (1) was an endothermic or exothermic reaction. However she got it wrong. What is her error and what should the answer have been? Anna's statement: The equation is an endothermic reaction because the energy is released from gaseous CO2 to the surroundings to become liquid CO2 causing the molecules to speed up.

The reaction between hydrogen and nitrogen monoxide is thought to proceed by the mechanism shown below. 2NO (g) N2O2 (g) fast equilibrium N2O2 (g) + H2 (g) → N₂O (g) + H₂O (g) slow reaction N2O (g) + H2 (g) → N2 (g) + H₂O (g) fast reaction (i) State the equation for the overall reaction (1 point) (ii) Deduce the rate expression consistent with this mechanism (iii) Explain how you would attempt to confirm this rate expression, giving the results you would expect. (iv) State, giving your reason, whether confirmation of the rate expression would prove that the mechanism given is correct. (V) Suggest how the rate of this reaction could be measured experimentally

A cobalt block was heated in a calorimeter to increase its temperature by 31.0 °C. The energy produced by the experiment was 2,150 J. What was the mass of the cobalt block? Specific Heat (CCo -0.117 J/g °C)

Which term describes the following mechanistic step in the catalytic cycle of the Heck reaction? a syn elimination b. reductive elimination c oxidative addition d. syn addition

The reaction HCl + NaOH H₂O (1) + NaCl (aq) is a(n)

2 K + 2 H₂O → 2 KOH How many grams (g) of potassium (K) could be produced by mixing 9.69 liters of water (H2O)?

The first-order rate constant for the hydrolysis of CH3 Cl (methyl chloride) in H2O has a value of 3.32 x 10-10 S-1 at 25°C and 3.13 x 10-9 s¹ at 40°C. What is the value of the energy of activation? [Hint: you'll need the Arrhenius equation. Set it up for two different temperatures & solve for Ea.]

Write chemical formulas for the following chemical compounds. Carbon dioxide Rubidium sulfide Copper(II) chloride Trinitrogen pentafluoride Beryllium iodide Cobalt(III) oxide Zinc oxide Silver chloride

"Sociology is the scientific study of social behavior and human groups". In this definition, which key concept deals with the issue of the scope of sociology? - whether there are behaviors sociology does not study. scientific study social behavior human groups none of the above

A chemist wants to make a gas-liquid solution. However, the not dissolve readily into the liquid solvent. Which step would MOST likely increase the solubility of the gas in the liquid solvent? Select one: a. Expand the volume of the liquid. b. Increase the temperature of the gas and liquid. c. Lower the pressure of the gas above the liquid. d. Increase the pressure of the gas above the liquid.

A sample of oxygen occupied 619 mL when the pressure increased to 1182.22 mm Hg. At constant temperature, what volume did the gas initially occupy when the pressure was 347.84 mm Hg? a. 2104 b. 182.1 c. 2129 d. 664.3

The amount of a radioactive element left after a certain number of hours can be determined by the function A(t) = A (1-p) where Ao is the initial amount of the element, t is the time in hours, and 0<p<1. What is the meaning of 1-p in terms of the context ? Enetr your answer in the space provided. After 2 hours, 36% of a certain element remains. If a sample has an initial amount of 100 grams, how many hours will it take until only 1 gram remains? Provide an answer supported by valid mathematical reasoning and /or calculations

In high school, it is common for children of the rich to flaunt their affluence with nifty clothing and expensive gadgets meant to provoke the envy of their schoolmates. This type of behavior is called: Conspicuous consumption invidious consumption conspicuous compassion prestige-seeking

A 46.6 L sample of gas at 36.9 °C and 218.2 mm Hg expands to 234.5 L at 10 °C. What is the new gas pressure? a. 39.6 b. 11.8 c. 47.5 d. 1.40

Draw the best Lewis structure for the following acids (hint!: the acidic H is bonded to O in an acid). Evaluate each atom using formal charge, showing your math work as well as your formal charge answers. b. The N ion can be drawn with two double bonds, or with a single bond and a triple bond. Both structures satisfy the octet rule. Use formal charge to evaluate the structures. Which do you think is the better choice? Give reasons to support your choice.

Which of the unknowns have equal numbers hydroxide (OH) and hydronium (H₂O ions? Yellow Teal Navy blue Light Green Blue

Phosgene, COCl2, is usually produced by the reaction between carbon monoxide and chlorine according to the equation: CO (g) + Cl2 (g) = COCI2 (9) (i) Deduce the equilibrium constant expression, Kc, for this reaction.(1 point) (ii) At exactly 600 °C the value of the equilibrium constant is 0.200. Calculate the standard Gibbs free energy change, AG°, for the reaction, in kJ, using sections 1 and 2 of the data booklet. State your answer to three significant figures. (3 points)

Write condensed structures for each of the following compounds. a. 2,2,4-trimethylpentane b. 5-isopropyl-2-methyloctane 1,1,3,3-tetrabromopropane d. 1,1-dichlorocyclopentane c. 1,4-diethylcyclohexane f. 1-bromo-2-methylcyclobutane

In The War of the Worlds, where does the narrator begin the story? A. After the events of the story have taken place B. In the middle of the story's main source of action C. At an unknown time period within the story D. Before the events of the story have happened

What is the name of a substance that can either donate a hydrogen ion or accept a hydrogen ion depending on what it is reacting with (water is the most common example)? alkaline acid indicator Oamphoteric

Propene is an important starting material for many products. The following shows some compounds which can be made from propene, C3H6. C3H6O a) An experiment was carried out to determine the order of reaction between one of the isomers of C3 H7 Cl and aqueous sodium hydroxide. The results (in the table) were obtained (i) Determine the rate expression from the results (1 point) (ii) explain your method. (2 points) Propene (C3 H6) C3 H7 Cl → C3H8 O Experiment 1: [C3 H7 Cl] = 0.05 [OH-] = 0.10 Initial rate (mol dm Experiment 2: [C3 H7 Cl] = 0.10 [OH-] = 0.20 Initial rate (mol dm Experiment 3: [C3 H7 CI] = 0.15 [OH-] = 0.10 Initial rate (mol dm-3

Given the reaction: 2 A (g) +B (g) → 3 C (g) + 2 D (g) The equilibrium constant for the reaction is 390 at 25 °C. At equilibrium, the concentration of A is 0.092 M, the concentration of B is 0.085 M and the concentration of D is 0.074 M. What is the equilibrium concentration of C? (4 points)

What is the name of the following acid: H₂CO₂ hydrocarbonic acid hydrocarbonous acid carbonic acid carbonous acid

According to the Bronsted-Lowry definition, a base is a substance that Accepts a hydrogen ion (H¹) Gives off a hydrogen ion (H) Accepts a hydroxide ion (OH) Gives off a hydroxide ion (OH)

The newly-discovered element X (Xeruvium) is a transition metal that can have multiple oxidation states and has a molar mass of 37.70 g/mol. What is the molar mass of the compound X(SO3)2? 235.54 g/mol 165.77 g/mol 291.42 g/mol 197.84 g/mol

Calculate the molarity of a solution if 42 grams of NaCl is dissolved in 780 mL of water. 56 M 0.92 M 1.1 M 54 M

HCO3 + H₂→ H₂CO₂ + OH™ In the equation above, what is the conjugate acid? OH™ H₂CO3 OH ₂0 OHCO3

Rank the following molecules based on decreasing boiling point (highest boiling point to lowest boiling point). I>II>III > IV II>I>III > IV I>III>IV > II IV>III>I> II IV> III>II>I