General Questions and Answers

The fluorine-17 nuclide radioactively decays by electron capture. Write a balanced nuclear chemical equation that describes this process.

Suppose a hydrogen-2 nuclide transforms into a helium-3 nuclide by absorbing a proton. Complete the nuclear chemical equation below so that it describes this nuclear reaction. S Ed TE

Suppose a carbon-14 nuclide decays into a nitrogen-14 nuclide by emitting an electron. Complete the nuclear chemical equation below so that it describes this nuclear reaction. 14 ỐC - D X Y 5 ?

Suppose a plutonium-239 nuclide transforms into a curium-242 nuclide by absorbing an alpha particle and emitting a neutron, Complete the nuclear chemical equation below so that it describes this nuclear reaction.

Draw the Lewis structure of CH₂CCH₂ and then choose the appropriate set of pair hybridization states for the three central atoms. Your answer choice is of the orientation of your drawn structure. independent + A) sp² / sp / sp² B) sp² / sp² / sp³ C) sp³ / sp² / sp D) sp² / sp² / sp² E) sp / sp³ / sp³

Which option contains a sentence that uses quotation marks correctly? "Are you going to take the test tomorrow"? she asked. O "Are you going to take the test tomorrow? she asked". O "Are you going to take the test tomorrow?" she asked. All of the choices

Suppose the amount of a certain radioactive substance in a sample decays from 1.10 mg to 900. µg over a period of 16.0 years. Calculate the half life of the substance. Round your answer to 2 significant digits.

An atom consists of a small, positively charged nucleus, surrounded by negatively charged electrons. We organize the electrons in a logical manner. As the atomic number increases, electrons are added to the subshells according to their energy. Lower energy subshells fill before higher energy subshells. The order of filling is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p. The periodic table can be used to help you remember the order. Part A Review Constants I Periodic Table Give the complete ground-state electron configuration for silicon (Si). Express the complete electron configuration using superscripts where appropriate. For example, the configuration for Li would be entered as 1s^22s^1. ▸ View Available Hint(s) 1s^2, 2s^2, 2p^6, 3s^2, 3p^2.

the Review link to access the section in your e Text. Identify the solute and solvent in each of solution. sugar water water is solvent and sugar is solute sugar is solvent and water is solute Submit ▾ Part C soda water Request Answer carbon dioxide is solvent and water is solute water is solvent and carbon dioxide is solute

3. Ozone, a component of smog, is a toxic substance that consists of only oxygen atoms. If ozone has a density of 2.1 g/L at standard conditions, then what is the chemical formula of ozone? Hint: Determine the molar mass of ozone.

The mercury-201 nuclide radioactively decays by electron capture. Write a balanced nuclear chemical equation that describes this process.

Suppose a fluorine-17 nuclide transforms into an oxygen-17 nuclide by absorbing an electron and emitting a gamma ray. Complete the nuclear chemical equation below so that it describes this nuclear reaction.

A sealed container holding 0.0255 L of an ideal gas at 0.979 atm and 75 °C is placed into a refrigerator and cooled to 43 °C with no change in volume. Calculate the final pressure of the gas. P = atm

A 15-m-tall barrel is closed on top except for a thin pipe extending 4.8 m up from the top. When the barrel is filled with water up to the base of the pipe (1.5 m deep) the water pressure on the bottom of the barrel is 15 kPa. Part A What is the pressure on the bottom when water is added to fill the pipe to its top? Express your answer to two significant figures and include the appropriate units.

Choose the sentence which uses the apostrophe correctly. O I went to my father-in-law house' for dinner last week. I went to my father-in-laws house for dinner last week. O I went to my father-in-law's house for dinner last week.

The following reaction is used to make carbon tetrachloride, CCl4, a solvent and starting material for the manufacture of fluorocarbon refrigerants and aerosol propellants. CS₂(g) + 3Cl₂(g) ----> CCl4(g) + S₂Cl₂(g) Calculate the number of grams of carbon disulfide, CS2, needed for a laboratory- scale reaction with 66.70 g of chlorine, Cl₂? Express your answer to 2 decimal places.

Use the following information to determine the lattice energy (in kJ/mol) of KCI(s): lonization energy of K(g) = 418.7 Enthalpy of sublimation of K(s) = 89.2 Enthalpy of formation of KCI(s): -435.9 Electron affinity of Cl(g) = -349.0 Bond energy of Cl₂(g) = 240.0

In May 2016, William Trubridge broke the world record in free diving (diving underwater without the use of supplemental oxygen) by diving to a depth of 124 m. Assume that he takes a breath that fills his lungs to 3.6 L at the surface of the water (1.0 atm). Calculate the volume that this same amount of air will occupy in his lungs when he reaches a depth of 124 m (13.3 atm). Enter the answer in units of liters.

Which of the following statements is true? Multiple Choice A molecule that is superimposable on its mirror image is chiral. A chiral molecule usually contains a plane of symmetry. An achiral molecule does not contain a plane of symmetry. Enantiomers are mirror images that are not superimposable.

Mix-'n'-match! Match the statements on the left with the statements on the right. You should use each of the statements on the right only once. AE> 0 AE < 0 q>0 9 <0 W> 0 W<0 A. heat is transferred from the system to the surroundings B. work is done by the surroundings on the system C. energy is transferred from the system to the surroundings D. work is done by the system on the surroundings E. energy is transferred from the surroundings to the system F. heat is transferred from the surroundings to the system

Select all that apply. 5 points Which of the following statements are true for batteries? Select all that apply. A. A fuel cell is an electrochemical cell but not a galvanic cell. B. A fuel cell requires no reactants other than the contents of the fuel cell. C. A battery is an electrochemical cell but not a galvanic cell. D. Lithium batteries provide a large current and are lighter than comparable batteries of other types. Lithium ion batteries are used in many portable electronic devices, including all-electric vehicles. E.

Which of the following is the definition of chirality? Multiple Choice The existence of a molecule with a carbon atom that has four different substituents. The existence of a molecule that is not superimposable on its mirror image. The existence of a molecule with a mirror image. The existence of a molecule that is superimposable on its mirror image.

Cr(OH)a(s) + CIO, (aq) → CrO2 (aq) + CT (ag) Fill in the coefficients and substances for the balanced overall equation. Note: Do NOT leave any coeffient fields empty. If the coefficient is 1, choose "1" as opposed to leaving it blank. - Cr(OH), +- CIO,Co+a+

Exercise C Calculating volume/volume % Concentration (1 pt per answer, 10 total) Complete the following table by calculating the volume/volume % for the following solutions. The volume/volume % is the volume of the solute in mL divided by the volume of the solution in mL x 100. The volume of the solution is equal to the volume solvent plus the volume of solute. Fill in all of the empty spaces. The volume of the solute and the solvent must be in the same units. Volume solute 85.0 mL 75 mL 200. mL 64 mL Volume solvent 175mL 4 1.200 Liters Volume of solution 300. mL 750. mL Volume/volume % 34.% 45%

Ni(CH3CO₂)2 + K₂SNIS + KCH3CO₂ The above reaction between nickel(II) acetate and potassium sulfide produces nickel(II) sulfide and potassium acetate. Balance the reaction. What is the coefficient in front of potassium acetate (KCH3CO₂) once balanced?

Look at your model and think about the relationship between oxygen and carbon dioxide in the sealed jar. Which of these statements is true? Plants and animals release oxygen during respiration. O Plants release only carbon dioxide during photosynthesis. Plants use oxygen during photosynthesis. Plants and animals use oxygen during respiration.

Calculate the cell potential at 25°C for the Cr(s) Cr³+ (aq)||Sn²+ (aq)|Sn(s) electrochemical cell if the concentration of Cr³+ (aq) is 0.50 M and the concentration of Sn²+ (aq) is 0.090 M. Report your answer to 3 significant figures. E cell Type numbers in the boxes 10 points V

Identify the precipitate(s) of the reaction that occurs when a silver nitrate solution is mixed with a sodium chloride solution. Check all that apply. View Available Hint(s) sodium nitrate silver nitrate silver chloride sodium chloride

What is the insoluble solid substance that is produced during some aqueous chemical reactions? In this reaction example, that would be AgF(s). NaF(aq) + AgNO3(aq) → AgF(s) + NaNO3(aq) Osolute O precipitate Otitrant Oreactant O empirical formula

Which one of the following statements is true? Select all that apply. A. An electrolytic cell does not require external voltage to operate. B.Oxidation occurs at the anode in a galvanic cell but not in an electrolytic cell. C. Reduction occurs at the cathode in a galvanic cell. D. When a galvanic cell is recharged, the reverse chemical reaction occurs as when the galvanic cell operates. E.Oxidation occurs at the cathode in an electrolytic cell. Select all that apply. 5 points

Enter your answer in the box provided. What is the ee for the following mixture of enantiomers A and B? 90% A and 10% B % ee

The following information is given for chromium at 1 atm: Tb = 2672.00°C Tm=1857.00°C Use the References to access important values if needed for this question. 2022.00°C. AHvap (2672.00°C) = 5.874 × 10³ J/g X AHfus (1857.00°C) = 281.5 J/g Specific heat solid = 0.4600 J/g °C Specific heat liquid = 0.9370 J/g °C A 35.20 g sample of solid chromium is initially at 1827.00°C. If the sample is heated at constant pressure (P = 1 atm), kJ of heat are needed to raise the temperature of the sample to

A brass alloy contains 70.1% copper, Cu, by mass with the remainder of the alloy being zinc, Zn. Determine the number of moles of zinc in 45.5 g of the brass alloy. moles of Zn = 13.6 atoms of Zn = Incorrect A Determine the number of atoms of zinc in 45.5 g of the brass alloy. 3.02 ×1023

How many molecules are present in each sample? 4.75 mol SO₂: 0.603 mol CO: 85.5 x1023 Incorrect 7.236 ×1023 Incorrect a sample of NH3 containing Avogadro's number of molecules: 24 x1023 molecules SO₂ molecules CO molecules NH3

Which of the following statements about constitutional isomers is not true? Multiple Choice They have different IUPAC names. They have different physical properties. They always have the same functional groups. They have different chemical properties.

Below is the structure of fructose, is it D- or L-fructose AND which numbered carbon determines this? CH₂OH C=O HO-H H-OH H-OH CH₂OH L-fructose; #4 carbon D-fructose; # 5 carbon D-fructose; #4 carbon OL-fructose; #5 carbon OL-fructose; #2 carbon 10

For carbon-based combustion reactions, there is a recommended order (a "rule") in which the atoms should be balanced initially. Put the atoms in the correct order for balancing according to this rule. should be balanced first. should be balanced second. should be balanced last. Question 10 [Choose] [Choose ] sodium nitrogen carbon calcium helium oxygen hydrogen 1 pts

You add 100.0 g of water at 55.1 °C to 100.0 g of ice at 0.00 °C. Some of the ice melts and cools the water to 0.00 °C. When the ice and water mixture reaches thermal equilibrium at 0 °C, how much ice has melted? (The specific heat capacity of liquid water is 4.184 J/g. K. The enthalpy of fusion of ice at 0 °C is 333 J/g.) Mass of ice = g

In an experiment, the decomposition of hydrogen peroxide, H₂O2 (aq), was used to produce oxygen gas, O2 (g). 2 H₂O2 (aq) 2 H₂0 (1) + O₂ (g) The reaction flask contained the H₂O2 and the test tube inside the flask contained a catalyst to speed up the reaction. The volume of oxygen gas produced was determined by water displacement. To determine the moles of oxygen produced, the reaction flask, including its contents, was weighed before and after the reaction. During the reaction the flask was placed in a cold water bath to cool the solution. After the reaction, if the outside of the reaction flask was still wet when it was weighed, how would this affect the molar volume of the oxygen gas that was determined? -> Select one: OA. The molar volume of the oxygen gas determined would be too large. B. More information is needed to answer this question. O C. This would not significantly affect the molar volume of the gas. O D. The molar volume of the oxygen gas determined would be too small.

Which of the following statements about meso compounds is not true? Multiple Choice A meso compound and its mirror image are identical. A meso compound generally has a plane of symmetry. A meso compound is chiral. A meso compound is achiral.

Rank the following groups in order of decreasing priority according to the Cahn-Ingold-Prelog system. I>II> IV > III III > II > IV>I III>IV>II>I III> I >II>IV

Determine the volume (mL) required to prepare each of the following. ▼ Part A 18.0 mL of a 0.200 M KNO3 solution from a 4.00 M KNO3 solution. Express your answer with the appropriate units. Value Submit μÀ Part B → Units Request Answer ? 20.0 mL of 2.50 M H₂SO4 solution using a 12.5 M H₂SO4 solution. Express your answer with the appropriate units. Review | Cons

Select one answer 5 points Which of the following descriptions is true for the cell below? Zn(s) | Zn²+ (aq) (0.5 M) || Cu²+ (aq) (1.0 M) | Cu(s) A. O When the cell reaches equilibrium, E = 0, and the cell will no longer work. cell B. O At 25 °C, when the reaction quotient, Q, is equal to the equilibrium constant, K, Eºcell = o. C. When the reaction quotient, Q, changes from its original value to when it equals 1, E does not change D. OE can be determined by using the standard half-cell potentials alone.

Answer the following for the reaction: Mg(s) + 2HCl(aq)-H₂(g) + MgCl₂ (aq) How many liters of hydrogen gas can form at STP when 0.491 L of a 2.02 M HCl solution reacts with excess magnesium? Express your answer with the appropriate units. What is the molarity of a HCl solution if the reaction of 47.6 mL of the HCl solution with excess magnesium produces 5.20 L of H₂ gas at 735 mmHg and 25 °C? Express your answer with the appropriate units.

Identify the correct in-text citation based on APA style for this source: Tannen, D. (1998). The argument culture. Toronto: Random House. Every issue we see discussed on television appears to be set up as an argument: "In the O argument culture, criticism, attack, or opposition are predominant if not the only ways of responding to people or ideas" (Tannen, 1998, p. 7). Every issue we see discussed on television appears to be set up as an argument: "In the argument culture, criticism, attack, or opposition are predominant if not the only ways of responding to people or ideas" (p. 7). Every issue we see discussed on television appears to be set up as an argument: "In the argument culture, criticism, attack, or opposition are predominant if not the only ways of responding to people or ideas" (The argument culture, 1998, p. 7).

Draw the Lewis structure of CH3NCO and then choose the appropriate set of hybridization states for the three central atoms. Your answer choice is independent of the orientation of your drawn structure.

If the energy of the system is the sum of the energy and work, identify the following: What happens to the volume if work was done by the system? A Volume increases B Volume decreases

Convert 0.3330 mol of Na₂SO4 to grams. Show the unit analysis by inserting the correct components into the unit-factor slots. It may be useful to consult the periodic table. 0.3330 mol Na₂SO4 X

Consider the chemical reaction that occurs when 50.00 g of dinitrogen tetroxide (N₂O4, 92.02 g/mol) reacts with 47.50 g of hydrazine (N₂H4, 32.06 g/mol) to produce nitrogen gas and water. How many grams of excess reagent are left over after the reaction has run to completion if the percent yield of the reaction was 100%? Excess reagent left over after the reaction with 100%

What did MITS design focus on? Increasing weight to minimize the energy needed to maintain height. Reducing the weight to minimize the energy needed to maintain height. Increasing drag to reduce the loss of energy to the air. Minimizing drag to reduce the loss of energy to the air.