General organic chemistry Questions and Answers

Complete combustion of 7.50 g of a hydrocarbon produced 23.0 g of CO₂ and 11.0 g of H₂O. What is the empirical formula for the hydrocarbon? Insert subscripts as necessary.

Today, people are struggling with the Covid-19 virus, and many scientists are working on the virus. 3. Which of the following could be the chemistry discipline that studies the effects of virus-related drugs and vaccines on the human body? A) Physiochemistry B) Polymer chemistry C) Biochemistry D) Forensic chemistry E) Petrochemistry

How many unpaired electrons are there in the orbital diagram for oxygen? 1 2 3 6 0

What is an orbital? the region of space around the nucleus with the highest probability of finding an electron the exact position of a nucleus at any given moment in time the path that an electron takes around the nucleus a circular energy level where the electron resides

Consider the neutralization reaction 2 HNO3(aq) + Ba(OH)₂ (aq) → 2H₂O(1) + Ba(NO3)₂(aq) A 0.100 L sample of an unknown HNO, solution required 39.3 mL of 0.150 M Ba(OH)₂ for complete neutralization. What is the concentration of the HNO3 solution?

19) Which R group would most likely be found in a hydrophobic area of the tertiary structure of a globular protein? A)-CH2-OH B)-CH₂-COO- C)-CH₂- D)- CH₂ CH₂ CH₂ CH2N H3 E) CH2-C–NH,

A barium hydroxide solution is prepared by dissolving 1.53 g of Ba(OH), in water to make 74.3 mL of solution. What is the concentration of the solution in units of molarity? concentration: The barium hydroxide solution is used to titrate a perchloric acid solution of unknown concentration. Write a balanced chemical equation to represent the reaction between barium hydroxide and perchloric acid. chemical equation: If 17.9 mL of the barium hydroxide solution was needed to neutralize a 5.46 mL aliquot of the perchloric acid solution, what is the concentration of the acid? concentration:

An 80.0 g sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 6905 J. What is the specific heat of the gas? C= J/(g. *C)

Given the thermochemical equations X₂ +3 Y₂2 XY3 AH₁ = -370 kJ X₂ +2Z₂ → 2XZ₂ AH₂ = -170 kJ 2Y₂+Z₂2Y₂Z AH3 = -230 kJ Calculate the change in enthalpy for the reaction. 4XY3 +7Z₂6Y₂Z+4XZ₂

A hot lump of 49.1 g of copper at an initial temperature of 87.2 °C is placed in 50.0 mL. H,O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final temperature of the copper and water, given that the specific heat of copper is 0.385 J/(g-°C)? Assume no heat is lost to surroundings.

This is the chemical formula for talc (the main ingredient in talcum powder): Mg3 (Si₂O5), (OH)₂ An analytical chemist has determined by measurements that there are 83.9 moles of oxygen in a sample of talc. How many moles of hydrogen are in the sample?

The specific heat of a certain type of metal is 0.128 J/(g-"C). What is the final temperature if 305 J of heat is added to 65.8 g of this metal, initially at 20.0 "C? Tfinal

Select all of the reagents that can be used to produce the Anti-Markovnikov product when reacted with an alkene or alkyne. Select all of the reagents that can be used to produce the Anti-Markovnikov product. A. H₂, Ni B. Li, EtNH), NH C. BH3:THF, H₂O₂, HO D.Hg(OAc)2. THF/H₂O, NaBH4 E. HBr F. HBr. (PhCO) ₂0₂ A B C D E F

Treatment of an organic compound with hot, concentrated hydriodic acid (also known as the Zeisel analysis) yields CH-I, indicating the presence of a methoxyl group (-OCH;). Unknown organic compound F (one of the opium alkaloids used in antispasmodic medicine, whose formula is CisH₂NO3) was treated with hot concentrated hydriodic acid to determine the number of methoxyl groups present in the molecule. When 7.12 mg of compound F is treated with hydriodic acid and the CH-1 thus formed is passed into alcoholic silver nitrate, 10.73 mg of silver iodide is obtained. How many methoxyl groups per molecule of compound F would be indicted by the results of this Zeisel analysis? (3 points)

Suppose you separate a 2.37 g mixture of sand and salt and recover 1.44 g of salt. What is the percent by mass of salt in the mixture?

SEP Analyze Data The lines on the phase diagram are labeled X, Y, and Z. Identify which line shows these phases. sublimation: melting: vaporization

A metal block of iron with a mass of 9.10 g is at 73.6° C. It is added to 99.3 g of water at 13.9 °C. What is the final temperature of the block and the water? The specific heat of iron is 0.450 J/gº c.

In each of the following groups, which element is least reactive? (Consider Periods 1-6.) (Express your answer as a chemical symbol.) a. Group 1: b. Group 7: c. Group 2: d. Group 6:

Using the symbol of the previous noble gas to indicate the core electrons, write the electron configuration for each of the following elements. a. selenium, Z = 34. b. titanium, Z= 22. c. rubidium, Z = 37.

Using the chemical formula CaO + 2 NaCl Na2O +CaCl2, calculate how many moles of CaCl2 you would produce if you used up 5.4 moles of CaO? ->>

Calculate the mass of 2.5 moles of NaOH. (1 points)

Calculate Volume/volume% of a solution made by dissolving 50 ml Ethanol in 250 ml H₂ (1 point formula, 1 pt units, 0.5 pt answer)

Select all examples where the Law of Conservation of Mass is not being followed. 2 NaCl + MgBr2 → 2 NaBr + MgCl2 H₂SO4 + 2 NaOH → Na₂SO4 + 2 H₂O S8(g) + Ag(s)→ 8 AgS Mg3N2(s) + 3 H₂O(1)→ NH3(g) + 3 Mg(OH)2(s)

If the balanced chemical reaction for the formation of Li₂O is 4 Li(s) + O2(g) → 2 Li₂O(s), how many molecules of Li₂O(s) would you produce if you used up 6 atoms of Li(s)? 6 12 2 3

Place the atoms and/or ions in order increasing atomic radius, electronegativity, effective nuclear charge, electron affinity and first ionization energy. a. Na, Si Cl Atomic radius: Electronegativity: Effective nuclear charge: Electron affinity: First ionization energy:

What is the frequency of light having a wavelength of 152 nm? (b) What is the wavelength (in meters) of radiation having a frequency of 10.18 × 107 Hz? (This is the type of radiation used by FM radio stations.) (a) Frequency of light: (Enter your answer in scientific notation) (b) Wavelength of radiation:

The atomic radius of metal X is 1.30 x 10² picometers (pm) and a crystal of metal X has a unit cell that is face-centered cubic. Calculate the density of metal X (atomic weight = 42.3 g/mol).

Why might Jeff and other scientists be working on making electricity from renewable sources, like solar energy? A because it is much more expensive to make electricity from non-renewable sources than to make it from renewable ones B because the sources used most are running out very quickly, and renewable sources will not run out any time soon C because renewable sources can burn more easily, which means we can produce more steam to power more machines D because using energy from renewable sources is a "wild and crazy idea", and scientists prefer to work on very creative projects

Atomic Structure 2: Electronic Structure:Question 6 Read the statement. lodine is on group 17 of the periodic table. Which option describes how iodine most commonly behaves when forming ions? It loses 1 electron. It loses 2 electrons. It gains 2 electrons. It gains 1 electron.

A gas occupies 18.7 L at 2.00 atm pressure and 27°C. How many moles of gas are present in the sample a 3.92 mol b. 3.02 mol c. 16.9 mol d. 0.760 mol e. 1.52 mol

An excess of Al and 2.3 mol of Br2 are reacted according to the equation 2A1+ 3Br2 → 2AlBr3 How many moles of AlBr3 will be formed assuming 100% yield? a. 3.5 mol b. 2.3 mol c. 1.2 mol d. 1.5 mol e. 0.8 mol

For the following reaction, determine the equilibrium constant at 700 °C if at this temperature. The equilibrium concentrations are as follows: [H₂] = 0.28 M, [S2] = 1.13 x 10-6M, [H2S] = 0.75 M 2H2(g) + S2(g) → 2H2S(g) A. 1.78 x 106 B. 8.47 x106 C. 6.35 x 106 D. 1.08 x 107 E. 3.22 x106

The balanced equation P4(s) + 6H₂(g) → 4PH3(g) tells us that 7.0 mol H₂ a reacts with 3.5 mol P4 b. cannot react with phosphorus c. reacts with 7.0 mol P4 d. produces 4.7 mol PH3 e produces 14.0 mol PH3

A 10.03g sample of high fructose corn syrup concentrates is burned in a bomb calorimeter containing 200.0 g H₂O. The temperature of the water increased by 15.53°C. If the molar mass of this nutrient substance is 198.17 g/mol, what is the fuel value (in nutritional Cal/g)? [1Cal = 1000 cal = 1 kcal; Specific heat of water = 1.00 cal/(g*°C)] A. 0.159 Cal/g B. 0.310 Cal/g C. 3.11 Cal/g D.3.08 Cal/g E. 0.786 Cal/g

What major assumption (that was analogous to what had already been demonstrated for electromagnetic radiation) did de Broglie and Schrödinger make about the motion of tiny particles? A tiny particle, such as an electron, behaves as a discrete particle. A tiny particle, such as an electron, behaves as a wave. A tiny particle, such as an electron, behaves simultaneously as a wave and as a discrete particle.

Rank the types of electromagnetic radiation from least energy to highest. _ gamma _ visible light _ ultraviolet _ infared _ radio _ microwave _ x-ray

What is the frequency (in reciprocal seconds) of electromagnetic radiation with a wavelength of 1.41 cm? Enter your answer in scientific notation.

To which element does each of the following electron configurations correspond? a.[Ne]3s²3p4 b.[Ar]4s² c. [Ar]48²3d¹04p¹

What is the maximum number of electrons possible with n = 4 in an atom?

What angular momentum (1) quantum number indicates an orbital that has a clover shape. 3 1 2 4 0

How much more energy per photon is there in green light of wavelength 526 nm than in red light of wavelength 631 nm? (Enter your answer in scientific notation.)

Identify the following three elements. (Capitalization counts!) An excited state of this element has the electron configuration 1s²2s²2p 3s¹. The ground-state electron configuration is [Kr]5s²4d¹05p². The ground-state electron configuration is [Ar]4s²3d¹04p².

Enter your answer in the provided box. The retina of a human eye can detect light when radiant energy incident on it is at least 4.0 × 10¯17 J. For light of 565-nm wavelength, how many photons does this energy correspond to?

Compare the ionization energies of each pair of atoms. Enter the symbol for the atom with the larger ionization energy. (If both atoms would be expected to have the same ionization energy, enter the word same.) Pairs Symbol of atom with the larger ionization energy H and Li C and N Na and K

Give the electron configurations for the following atoms. Do not use the noble gas notation. Write out the complete electron configuration. Example: Mg 1s²2s22p63s² Element Electron configuration P S He B Li

Compare the atomic sizes of each pair of atoms. Enter the symbol for the larger atom of each pair. (If both atoms are the same size, enter the word same.) Pairs Symbol for larger atom H and Li C and N He and Kr

Consider the following reaction for the combustion of octane, Cs H18: 2C8H18(l) +25O2 (g) → 16CO₂(g) + 18H₂O(l) What volume of oxygen gas at STP would be needed for the complete combustion of 13.9 g of octane?

What volume of hydrogen gas is produced when 27.8 g of sodium reacts completely according to the following reaction at 25 °C and 1 atm? sodium (s) + water(l) -> sodium hydroxide (aq) + hydrogen(g) liters hydrogen gas

In a flask, 10.3 g of aluminum reacted with 100.0 g of liquid bromine to form aluminum bromide. After the reaction, no aluminum remained and 8.5 grams of bromine remained unreacted. How many grams of bromine reacted? How many grams of compound were formed?

What volume of hydrogen gas is produced when 77.4 g of iron reacts completely according to the following reaction at 25 °C and 1 atm? iron (s) + hydrochloric acid(aq) -> iron(II) chloride (aq) + hydrogen(g)