Organic Chemistry Questions

10 An aqueous solution at 25 °C has a OH concentration of 1.7 x 107 M. Calculate the H₂O concentration. Be sure your answer has the correct number of significant digits.

2. How satisfied do you think the founding fathers would be with the way that the Constitution has evolved and been used overtime? Be sure to consider issues of the President's power over war, the size of the national government and the protection of civil liberties.

7) The percent composition of an unknown substance is 75.42 % Carbon, 6.63 % Hydrogen,8.38 % Nitrogen, and 9.57 % Oxygen. If its molar mass is 334.0 g/mol what is its empirical and molecular formula?

One of the challenges astronauts face is in space travel is the build-up of carbon dioxide in their spacecraft. The average human exhales about 42.0 of carbon dioxide per hour. One method to remove the excess carbon dioxide from the air is using solid lithium hydroxide: CO2(g) + 2 LiOH(s) Li₂CO3(2) H₂O(1) If a typical cannister of LiOH contains 750.0 g, how many hours will it last for one person before it has to be replaced? (6 marks): (I)

Be sure to answer all parts. Answer the following questions about the molecule Cl₂O. a. How many valence electrons does Cl₂O contain? _ valence electrons

Be sure to answer all parts. Rank the atoms in each group in order of increasing electronegativity. a. Ge, C. Si (select) b. N. Si, C

Metals that can form cations with variable charge are typically found in which of the following areas of the periodic table? Check all that apply. Group 4A Group 7A Transition metals Group 2A

A chemist prepares a solution of mercury(I) chloride (Hg₂Cl₂) by measuring out 0.275 mg of mercury(1) chloride into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's mercury(I) chloride solution. Be sure your answer has the correct number of significant digits.

A chemist prepares a solution of aluminum chloride (AICl3) by measuring out 15. g of aluminum chloride into a 50. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's aluminum chloride solution. Be sure your answer has the correct number of significant digits.

A chemist prepares a solution of potassium permanganate (KMnO4) by measuring out 26. µmol of potassium permanganate into a 400. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in μmol/L of the chemist's potassium permanganate solution. Be sure your answer has the correct number of significant digits.

Given the following balanced equation, determine the rate of reaction with respect to [Cl 2]. If the rate of Cl 2 loss is 4.00 x 10 what is the rate of formation of NOCI? 2 NO(g) + Cl 2(g) → 2 NOCI(g) 7.25 x 10-2 M/s 1.00 × 10-1 M/s 4.00 × 10-2 M/s 8.00 × 10-2 M/s 2.00 × 10-2 M/s

List the common prefixes in order of increasing number of atoms. (Place the largest number of atoms on the bottom.) Place these in the proper order. Penta Hepta Nona Tri

The electronic configurations of neutral atoms are given. Match each electronic configuration of the neutral atoms with the charge of its monatomic ion. 1s2 2s1 1s2 2s2 2p5 1s2 2s2 2p6 3s2 Drag statements on the right to match the left. +1 -1 +2

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

Be sure to answer all parts. Give the symbol for each ion. cobalt(II):

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)

Be sure to answer all parts. Write the formula for the ionic compound formed from each cation and anion. a. potassium and bisulfite b. barium and acetate

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 hospital buys a compound that contains an isotope of barium. Several months later, most of the barium has changed to the element lanthanum. Which of the following is responsible for this change? reactions with the container wall exposure to air radioactive decay absorption of moisture from the air

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.

2 NO₂ (g) = N₂O₂(g) + 58.8 kJ What happens to the equilibrium if the temperature is increased? More NO2₂ will be formed. The equilibrium will remain the same A new product will form. More N₂04 will be formed.

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

In ionic compounds, metals form _ whereas nonmetals form _ For a main group element, the charge of its ion can be determined from the _ number.

Given the balanced equation a reaction: + Br₂ → CH₂CH₂CH₂Br representing CH₂CH₂CH3 + HBr This organic reaction is best classified as 1) an addition reaction 2) an esterification reaction 3) a polymerization reaction 4) a substitution reaction

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.

Using the trends in the periodic table, rank the following atoms in order of increasing electronegativity. a. O, C, Be b. B. O, N

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

A patient at risk for cardiovascular disease is found to have a blood LDL concentration of 180 mg/dL. Calculate the total mass of LDL circulating in the blood of this patient given the total volume of blood is 5.3 L. 0.94 g 2.9 g 34 g 9.5 g

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

Hopkinsium (Hk) is an element that has not been discovered yet. There are 210 grams in one mole of Hk. If a chemist reacts 4.6 grams of Hk according to the following reaction, how many grams of HkBr will form? 2 Hk + Br₂ → 2 HkBr * -

Calculate the number of molecules of oxygen present in 0.125 moles of O₂. (1 mole = 6.022 1023 objects). Show all your working clearly. A) 3.01 x 1024 molecules B) 7.53 x 1022 molecules C) 0.125 molecules D) 6.022 x 1023 molecules

How much energy does a 10.0 g sample of water absorb as energy in the form of heat if its specific heat is 4.2 J/(g-°C) and it is heated from 10.0°C to 40.0°C? a.1.26 kJ b. 30°C c. 12.6 joules d. 300 joules e. some other answer

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?

Which one of the following statements about atomic structure is false? An atom is mostly empty space. Almost all of the mass of the atom is concentrated in the nucleus. The protons and neutrons in the nucleus are very tightly packed. The number of protons and neutrons is always the same in the neutral atom. All of these statements are true.

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.

For the following reaction, 25.1 grams of carbon disulfide are allowed to react with 98.1 grams of chlorine gas. carbon disulfide(s) + chlorine(g) → carbon tetrachloride(1) + sulfur dichloride(s) What is the maximum amount of carbon tetrachloride that can be formed? What is the FORMULA for the limiting reagent? What amount of the excess reagent remains after the reaction is complete?

The boiling of water is a: chemical change because heat is needed for the process to occur. physical change because the gaseous water is chemically the same as the liqui physical change because the water merely disappears. chemical change because a gas (steam) is given off. chemical and physical damage.

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

All of the following are characteristics of metals except: malleable. ductile. often lustrous. tend to gain electrons in chemical reactions. good conductors of heat.

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

4. Proteins are made of amino acids. G Proteins and G Protein Coupled Receptors cross the cell membrane multiple times. The region between the layers of the cell membrane eris hydrophobic and nonpolar, while the region both inside the cell and outside the cell is an aqueous solution. For each of the above amino acids, would more likely find them in the part of the protein (a) between the layers of the cell membrane, or (b) outside the cell membrane? Explain your reasoning. Valine: Glutamine: Serine: Methionine: Reasoning: M-D