General organic chemistry Questions and Answers

Be sure to answer all parts. Draw a valid Lewis structure for each molecule. a. HBr b. C₂HCI

A 20.0 L cylinder of oxygen gas is at a temperature of 27.0°C and a pressure of 5.00 atm. What is the density of the oxygen gas in the cylinder? 3.25 g/L 6.50 g/L .0.203 g/L 72.0 g/L

[References] Freon-12 (CCl₂F2) is used as a refrigerant in air conditioners and as a propellant in aerosol cans. Calculate the number of molecules of Freon-12 in 5.90 mg of Freon-12. molecules What is the mass of chlorine in 5.90 mg of Freon-12? Mass= mg

Label each statement as "true" or "false." a. Ionic compounds have high boiling points. (select) b. The ions in a crystal lattice are arranged randomly and the overall charge is zero. (select) c. When an ionic compound dissolves in water, the solution conducts electricity. (select) d. In an ionic crystal, ions having like charges are arranged close to each other. (select)

A chemist prepares a solution of sodium chloride (NaCl) by measuring out 64.1 μmol of sodium chloride into a 350. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in μmol/L of the chemist's sodium chloride solution. Be sure your answer has the correct number of significant digits.

Give the name of each ion. a. Cl- chloride chloride (I) chlorine chlorine (I) b. Cr²+ chromium (II) chromium (III) chromate chromic c. Li lithic lithium lithous lithate d. K potassous pottassate

Type your answer in the box. Fill in the blanks to provide the correct name for each lon below. Include the element name and charge where appropriate. Do not capitalize the element name. Ca²: AP: Fe": Pb":

A student fills a flask with 5.0 moles of nitrogen gas and then seals the flask. Which change will happen when the student cools the flask? The temperature of the nitrogen gas will increase The volume inside the flask will decrease. The pressure inside the flask will decrease The molar mass of the nitrogen gas will increase.

A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature rises rapidly. Which of the following statements is best supported by this observation? A dehydration reaction occurred. The beaker was contaminated by another compound. An endothermic reaction occurred. An exothermic reaction occurred.

The specific heat of copper is about 0.4 joules/ gram ºC. How much heat is needed to change the temperature of a 30-gram sample of copper from 20.0 °C to 60.0 °C? 480 J 1000 J 240 J 720 J

A ship cabin has a volume 7.32 x 10 8 L and pressure of 966 KPa. Calculate the pressure in the cabin when temperature changes from 24 °C to 36 °C.

Compare the boiling points of cyclopentane and cyclobutane. Use this information to put the following compounds in order from lowest to highest boiling point: cyclohexane, cyclobutane, cyclopropane, cyclopentane. I

Be sure to answer all parts. How many protons and electrons are present in each ion? a. Mg2+ b. V2+ a. _ protons and _ electrons b. _ protons and _ electrons

Be sure to answer all parts. Draw a Lewis structure for each covalent molecule. a. CH3F b. N₂H4

What is the mass of a water molecule ? grams

For the following reaction, 23.4 grams of iron are allowed to react with 5.57 grams of oxygen gas. iron (s) + oxygen (g) → iron(II) oxide (s) What is the maximum amount of iron(II) oxide that can be formed? What is the FORMULA for the limiting reagent? What amount of the excess reagent remains after the reaction is complete?

Avogadro's hypothesis states that: at the same temperature and pressure, equal volumes of different gases contain an equal number of particles. a given compound always contains exactly the same proportion of elements by mass. each atom of oxygen is 16 times more massive than an atom of hydrogen. when two elements form a series of compounds, the ratios of masses that combine with 1 gram of the first element can always be reduced to small whole numbers. mass is neither created nor destroyed in a chemical reaction.

In an oxidation-reduction reaction, electrons are transferred from the substance being oxidized to the substance being reduced from the substance being oxidized to the reducing agent from the substance being reduced to the oxidizing agent from the substance being reduced to the substance being oxidized from the oxidizing agent to the reducing agent

Question 9 (5 points) You are investigating an alien planet and discover that the planet has many extremely heavy elements that do not exist on earth. You are able to collect the following data about the isotopes of one mystery element: Your Answer: Based on this information, determine the average atomic mass of this element. Answer

Zinc (Zn) is reacted with Hydrochloric acid (HCI) to form zinc chloride and hydrogen gas. Zn (s) + 2 HCl(aq) → ZnCl2 (aq) + H₂ (g) → The reaction is carried out in a glass container that has a mass of 14.7 grams. After placing the zinc in the glass container, the mass is 29.5 grams. The HCI solution is poured into the container and the zinc chloride is formed. The excess hydrochloric acid is removed leaving the glass container and the zinc chloride, which together have a mass of 37.5 grams. What is the percent yield? Note: Show calculations for full credit.

NAD and NADPH are distinguished from each other by the the sugar ring attached to the adenine. A) adenine B) phosphate group C) carbon dioxide D) nicotinamide that's bonded to

Q1. What will be the correct R/S designation of the following molecule? (5 pts) Q2. What is the relationship of the following pairs of compounds? (5 pts) (A) Enantiomers (B) Conformational (C) Diastereomers (D) Meso

Which of the following statements is FALSE? Silicon is a metalloid Germanium is a metal Hydrogen is a non-metal Gold is malleable Sulfur does not conduct electricity

Your death will come to you, and never You shall be, else, a slave of life, Just waiting for a dawn's favor, From nights of poverty and strife. She'll build with you a common law, One will of the Eternal Reign. And you are not condemned to slow And everlasting deadly pain. Despair Relationships Death Hate

For the following elements, draw Lewis dot diagrams, arrows to show the transfer of electrons and charges. Then, write the chemical formula and name for the compound. (3 points each) sodium and phosphorus

Which Lewis symbol for an ion is incorrect? Multiple Choice Na Ca2+ Sn4+

If a botanist wants to learn about a new method of crossbreeding orange trees so she can use the technique in her own experiments, what type of source should she use? A. A primary source, because it will contain more details B. A secondary source, because it is written by a scientist C. A secondary source, because it will include more data D. A primary source, because it will be easier to read

If 1.28 moles of hydrogen react, how many water molecules will be produced, according to the following equation: 3H₂ + Fe₂O₃ → 2Fe + 3H₂O Select the correct answer below: (1) 7.71 X 10²⁴ (2) 1.28 x 10²⁴ (3) 7.71 x 10²³ (4) 1.28 x 10²²

Calculate the H₃O+ concentration from each pH: (a) 4; (b) 9. (a) ▭ x 10^▭M (b) ▭ x 10^▭M

A 16.200 g sample contains 4.800 g F, 4.900 g H, and 6.500 g C. What is the percent composition of hydrogen in this sample?

Based on the periodic table, which atom would have the highest ionization energy: As, Br, K or Se? Enter the symbol for the atom with the highest ionization energy.

What is the molar mass of a gas if 1.15 g of the gas has a volume of 224 mL at STP?

A. CH₃CH₂COOH + KOH → B. CH₃CH₂NH₂ + HCl →(no heat) C. CH₃CH₂CONHCH₃ + HCl + H₂0 → D. CH₃CH₂COOH + SOCl₂ → E. CH₃COONa+ CH₃NH₃Cl (room temp, no Catalyst not amide formation→ D. CH₃CH₂CH₂COCl+ (CH₃)₂NH →

Compared to saturated fatty acids, unsaturated fatty acids have A. lower melting points. B. higher melting points C. shorter carbon chains D.longer carbon chains, E. greater intermolecular attraction

Convert the following structural formulas to line-angle drawings. (CH₃)₂ CHCOCH(CH₂CH₃)CH₃ Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges.

Which of the following is true for a system at equilibrium? (A) The concentrations of reactants and products are equal. (B) The rate constants for the forward and reverse reactions are always equal. (C) The rate of the forward and reverse reactions are equal. (D) All the above are true.

Which of the following are spontaneous processes? 1. Ice melting at 1atm and 298 K (assume only ice is initially present). 2. Heat flowing from a hot object to a cold object. 3. An iron bar rusting. A) 1 only B) 2 only C) 3 only D) 1 and 3 only E) 1, 2,' and 3

Two kittens are sleeping by a furnace vent. They are relying mainly on what kind of heat transfer? A. Chemical heating B. Radiation warming C. Convection heating D. Thermal conduction

In the reaction: CH₃COOH +CH₃OH ---> CH₃COOCH₃ + H₂O the organic product can best be identified as (A) an ester (B) a ketone (C) an organic acid (D) an alcohol

An atomic cation with a charge of +2 has the following electron configuration: 1s²2s²2p^6 3s' What is the chemical symbol for the ion? How many electrons does the ion have? How many 2s electrons are in the ion?

Does a buffered or unbuffered solution show the greatest change in pH when an acid or base is added? Why?

To help farmers and gardeners, commercial fertilizers have a big three-number "NPK" label on the bag that gives the amounts of three key plant nutrients: nitrogen, phosphorus and potassium. For example, a bag of "10-10-10" fertilizer has 10% by mass nitrogen, 10% by mass potassium as potash (K,9), and 10% by mass phosphorus as phosphate (P2O5). Suppose a certain fertilizer has the following composition: INGREDIENT PERCENT BY MASS Ammonium Phosphate [(NH4)3PO4] 17% Calcium Nitrate [Ca(NO3)2] 31% Urea [(NH2)2CO] 29% Inert Ingredients 23% What should the first (nitrogen) number on the bag label be? That is, calculate the percent by mass of nitrogen in this fertilizer. Round your answer to the nearest percent.

Which compound is classified as a hydrocarbon? (A) ethanoic acid (B) chloroethane (C) ethane (D) ethanol

The functional group-COOC-is found in 1. esters 2. aldehydes 3. organic acids 4. alcohols

What is the partial pressure in atmospheres of H₂, if a mixture has 5.0 moles of CO₂, 3.0 moles of N₂, and 1.0 mole of H₂? The container has a total volume of 5.73 L at room temperature of 25.00 °C. • Your answer should have two significant figures (round your answer to one decimal places). • Use R= 0.08206 L atm/mol K

Which of the following statements is/are false? a) The wavelength of microwave radiation is shorter than the wavelength of gamma radiation. b) A car has a longer de Broglie wavelength than an atom when traveling at the same velocity. c) A continuous spectrum contains no observable gaps, all wavelengths of a given range is observed.

According to Le Chatelier's principle, when the volume of a system is reduced, the reaction will shift... (A) To the side with fewer gas molecules (B) In favour of the endothermic reaction (C) In favour of the exothermic reaction (D) To the side with more gas molecules

Determine if NaNH2 is a suitable reagent to deprotonate each of the two compounds shown below. l = yes; II = yes l = no; II = no l = no; Il = yes l = yes; Il = no Not possible to determine with the information provided

A gas mixture contains 0.45 mol of neon and 0.56 mol of xenon in a 4.00 L flask at 318 K. What is the total pressure of the mixture? Select the correct answer below: (A) 6.6 atm (B) 0.80 atm (C) 3.9 atm (D) 3.7 atm

1. How many unpaired electrons are in the oxygen atom? This atom is A. Paramagnetic B. Diamagnetic 2. How many unpaired electrons are in the nickel atom? This atom is A. Paramagnetic B. Diamagnetic