Organic Chemistry Questions

Which statements below that is true of ß decay? Select the correct answer below: OIt is most likely to occur when the nucleus is in an excited state. It decreases the nuclide's mass number. It increases the nuclide's mass number. It is most likely to occur when the neutron:proton (n:p) ratio of the nuclide is too large.

The oxygen in the air we breath is classified as: the solvent in a simple mixture. the solute in a homogeneous gas mixture. the solute in a heterogeneous gas-liquid mixture. the solvent in a homogeneous gas mixture

If the half-life of a radioactive isotope is 12 hours, what percentage of the initial sample will remain after 36 hours?

Which fact about fuel cells is FALSE? Fuel cell automobiles are powered by water and the only emission is hydrogen. Fuel cell automobiles are environmentally friendly. Fuel cell automobiles are whisper quiet. Fuel cells are based on the tendency of some elements to gain electrons from other elements.

Metalloids have properties of metals and nonmetals. Under certain conditions, a metalloid may behave as a metal and under another condition, the "the same metalloid" may behave as a nonmetal. Some metalloids are used in semiconductors. True False

During spontaneous fission, a nucleus of 98Cf254 can produce 108 Pd 46 and what other nuclide?

Write a balanced nuclear equation for the following reaction. Give all nuclei in the form ZX A. Decay of curium-243 by α emission: -

Unlike a change in concentration or pressure, a change in temperature will affect the Select the correct answer below: rate of the forward reaction rate of the reverse reaction equilbrium constant none of the above

In the reaction above, what will happen to the reaction rate if (circle your answer): a) The concentration of alky bromide is doubled. b) The concentration of methanol is doubled.

What will happen to the following equilibrium if the volume of the vessel in which the equilibrium is contained increases? 2CH4 (G) C₂H6 (G) + H₂(g) Select the correct answer below: It will shift to the right. It will shift to the left. There will be no change. It depends on the factor by which the volume increases.

From what you know of the activity of the halogens: Will the following reaction occur? Br₂ + HF -> True False

Why is the N-H bond in an amine a polar covalent bond? Hydrogen is more electronegative than nitrogen Nitrogen is more electropositive than hydrogen Nitrogen is more electronegative than hydrogen Hydrogen is electrophilic. None of these

Refer to the precipitation reaction below. BaCl₂ (aq) + H₂SO4 (aq) → BaSO4 (s) + 2HCl(aq) How much 0.22 M H₂SO4 solution in liters will completely precipitate the Ba²+ ion in 1.2 L of 0.19 M BaCl₂ solution? Do not include units in your answer, and round to two significant figures. Provide your answer below:

A sample of rainwater has a pH of 3.19. Calculate the H₂O concentration in the sample. [H₂O¹] =

How many milliliters of a 0.80 mM ammonium hydroxide solution are required to create 2.0 L of 0.30 mM solution? Do not include units in the answer. Your answer should have two significant figures.

Refer to the precipitation reaction below. 3CaCl₂ (aq) + 2Na3PO4 (aq) → 6NaCl (aq) + Ca3(PO4)2 (S) How many liters of 0.20 M CaCl₂ will completely precipitate the Ca²+ in 0.50 L of 0.20 M Na3PO4 solution?

Which type of reaction is represented by the following? (note: the reaction is not balanced) K + ZnCl₂ --> Zn + KCI synthesis decomposition single displacement double displacement

Calculate the value of [H,O] from the given [O] in each solution and label the solution as acidic or basic: (a) [OH] = 8.0 × 10-¹1 M: (b) [OH]=L6x 102 M. (b) x 10 (c) x 10

Calculate AH for the reaction 4 NH3 (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O (g), from the following data. N₂ (g) + O₂ (g) → 2 NO (g) N₂ (g) + 3 H₂ (g) → 2 NH3(g) 2 H₂ (g) + O₂(g) → 2 H₂O(g) AH--180.5 kJ AH-91.8 kJ AH-483.6 kJ

Please keep this question open while you are working on it. For this question, please show your work on a piece of paper. Be sure to include all steps, calculations and units. Submit a picture of your work to the Unit 3 Test dropbox within 5 minutes of completing the test. Calculate AH for the reaction 4 NH3 (g) + 5 O₂ (g) - 4 NO (g) + 6 H₂O (g), from the following data. N₂ (g) + O₂(g) → 2 NO (g) N₂ (g) + 3 H₂(g) → 2 NH₂ (g) 2 H₂(g) + O₂(g) → 2 H₂O(g) AH--180.5 kJ AH-91.8 kJ AH-483.6 kJ

Refer to the precipitation reaction below. CaCl₂ (aq) + 2AgNO3 (aq) → Ca(NO3)₂ (aq) + 2AgCl (s) How much 1.5 M CaCl₂, in liters, will completely precipitate the Ag* in 1.0 L of 0.20 M AgNO, solution?

What is the concentration (in milligrams per milliliter) of a solution of KH₂PO4 if 250 mL of it can be used to prepare 1.0 L of a 0.50 mg/mL solution?

What is true about intermolecular forces? Select the correct answer below: They are attractions within a molecule. They are attractions between molecules or particles. They are stronger than bonds between atoms. They only occur in the gas phase.

Dispersion forces occur due to: Select the correct answer below: the presence of polar covalent bonds the temporary asymmetry of electron density the geometry of particular molecules none of the above

What will happen to the pressure of a gas if its volume triples (increases by a factor of three) as the amount of gas and the temperature are held constant? Select the correct answer below: The pressure will decrease by a factor of three. The pressure will triple (increase by a factor of three). The pressure will double (increase by a factor of two). The pressure will be cut in half (decrease by a factor of two).

Refer to the precipitation reaction below. 3BaCl2 (aq) + Al2(SO4)3 (aq) → 2AlCl3 (aq) + 3BaSO4 (s) 2+ in How much 0.50 M BaCl₂ solution, in liters, will completely precipitate the Ba 1.0 L of 0.15 mol Al₂(SO4)3 solution?

1) (solution/solvent/solute) Use the correct word in the following sentence: dissolved in makes up a 2) What is the difference between a strong electrolyte and a weak electrolyte? saturated/supersaturated/unsaturated? 3) As the temperature of the solution (increases/decreases) solid in that liquid (increases/decreases) As the temperature of solution (increases/decreases), _the solubility of a that liquid (increases/decreases) the solubility of a gas in

A 12.5 g sample of a compound exerts a pressure of 1.59 atm in a 0.750 L flask at 385 K. What is the molar mass of the compound? Select the correct answer below: 408 g/mol 189 g/mol 331 g/mol 275 g/mol

Describe what happens to a cell in a hypotonic solution versus a hypertonic solution. Determine if the solutions below are isotonic, hypertonic, or hypotonic: a) 2% NaCl b) 2% Sugar c) 0.5 % NaCl d) 7% Sugar e) 0.9% NaCl f) 0.9% Sugar g) 5% Sugar h)5% NaCl

Which of the following is the correct verbal description of Avogadro's Law? Select the correct answer below: Equal volumes of all gases, measured under the same conditions of temperature and pressure, contain the same number of molecules. Equal volumes of all gases, regardless of the conditions of temperature and pressure, contain the same number of molecules. Equal volumes of all gases, measured under the same conditions of temperature and pressure, have the same mass. Equal volumes of all gases, regardless of the conditions of temperature an pressure, have the same mass.

Which of the following is the correct relationship between pressure and moles of gas, according to the kinetic molecular theory, at constant temperature and volume? Select the correct answer below: They don't depend on each other. They can be both directly and inversely proportional to each other depending on the circumstances. They are directly proportional. They are inversely proportional.

Suppose a solution is dilute. What can be said of this solution? Select the correct answer below: The solution is supersaturated. The solution is not supersaturated. The solute is insoluble. None of the above

What is the molarity of an acetic acid (CH3COOH) if 21.5 mL of 0.46 M NaOH are needed to neutralize 24.0 mL of the sample?

What are adhesive forces? Select the correct answer below: Intermolecular forces between identical molecules of a substance Intermolecular forces of attraction between two different molecules Covalent bonds holding an individual molecule together Repulsive interactions that keep molecules apart

Which acid, A or B, is stronger in each part? a. Acid A dissociates to a greater extent in water than acid B. (select) b. Acid A has a smaller K, than acid B. (select) c. The conjugate base of acid A is stronger than the conjugate base of acid B. (select)

What is true about hydrogen bonding? Select the correct answer below: It is a covalent bond. It is weaker than dispersion forces. It is stronger than typical dipole-dipole attractions. It only occurs in water.

How many milliliters of 3.9 M NaOH are needed to neutralize 5.4 mL of a 3.6 M H₂SO, solution? mL NaOH solution

Calculate the pH of each aqueous solution: (a) 0.0000071 M HCl; (b) 0.068 M KOH.

Carbon is able to form large numbers of organic compounds because carbon can form 4 bonds form single, double and triple bonds form chains, rings, spheres and sheets the carbon-carbon bond is very stable all of the above

Consider a buffer prepared from the weak acid HNO₂ and its conjugate base NO₂-. What happens to the concentrations of HNO₂ and NO₂- when a small amount of base is added to the buffer? HNO₂(aq) + H₂O(l) NO₂- (aq) + H30+ (aq) The concentration of HNO₂ (select) and the concentration of NO₂-(select)

Which of the following exhibits the weakest dispersion force? Select the correct answer below: molecules that are smaller molecules that are larger molecules that are electrostatic none of the above

What is the molarity of an HCI solution if 20.0 mL of 0.43 M NaOH are needed to neutralize 23.0 mL of the sample?

Which is NOT an example of the surface tension of water? Select the correct answer below: Water spilled on a countertop will bead up. Some insects can stride across the surface of ponds. A paperclip will float on the surface of water. An anchor sinks to the ocean floor.

Be sure to answer all parts. Calculate the value of [H3O+] from the given [OH] in each solution and label the solution as acidic or basic: (a) [OH]=7.4 x 10-10 M; (b) [OH]=7.3 x 10¹ M.

If HCOOH is a stronger acid than CH3COOH, which compound forms the stronger conjugate base?

Water will generate the strongest adhesive forces with a surface that is able to: Select the correct answer below: participate in dispersion forces generate hydrogen bonds bend significantly expand with heat

The acid in acid rain is generally sulfuric acid (H₂SO4). When this rainwater falls on statues composed of marble (CaCO3), the H₂SO4 slowly dissolves the CaCO3. Write a balanced equation for this acid- base reaction. (Include the phase of the substances.)

28. (a) If 175.00 g of CO2 (in the photosynthesis reaction below) react, then how many grams of glucose (C6H1206) are produced? 6 CO2 + 6 H₂O → C6H12O6 + 6 02 (a) If 110.50 g of glucose were isolated, then what is the percent yield?

Like H₂O, HCO3- is amphoteric. (a) Give the formula for the conjugate acid of HCO3-. (b) Give the formula for the conjugate base of HCO3-. (a) (b)

Some liquid antacids contain suspensions of aluminum hydroxide [Al(OH)3]. Write a balanced equation for the reaction of Al(OH)3 with the HCI in stomach acid. (Include the phase of each substance.)