General Questions and Answers

arning Goal: use the equilibrium constant and Le Châtelier's nciple to determine how a reaction will respond external factors. reaction is at equilibrium when the concentrations the reactants and products no longer change er time. This does not mean the reaction is over; ther, two competing reactions continue to occur multaneously at equal rates. The two competing eactions are the forward reaction (reactants →→ roducts) and the reverse reaction (products → eactants). f a reaction at equilibrium is subjected to a stress, the concentrations of reactants and products adjust to reestablish equilibrium. This is called Le Châtelier's principle. A stress might be a change in the concentration of reactants or products, a change in the volume of the reaction container, a change in temperature, or the addition of a catalyst. The following reaction is at equilibrium in a 2.0-L vessel: 2SO2(g) + O2(g) = 2SO3(g), How do the following actions affect the equilibrium of the reaction? Drag the appropriate items to their respective bins. ►View Available Hint(s) Shift to reactants increase volume decrease volume Shift to products add sulfur dioxide gas remove oxygen gas No shift K=1.4 x 10¹ Reset Help Revie add catalyst

The specific heat capacity of solid tungsten is 0.133 J/g °C. (a) Determine the amount of heat energy that is associated with heating a 13.3-g sample of solid tungsten from 24.2 °C to 35.9 °C. J (b) Calculate the final temperature reached when 124 J of heat is added to a 25.0-g sample of solid tungsten initially at 24.2 °C. °C

Two new elements have been discovered: Adamantium (Ad) and Serpentine (Ss)! Adamantium has been proven to have three valence electrons. Serpentine has been proven to have six valence electrons. Based on this information, identify the subscripts for the expected chemical formula for the combination of these two elements. Use a "1" when needed. Ad Blank 1: Blank 2: Ss

Consider the 1.12 litre mixture of O, and O, at 0°C and 1 atm pressure which is allowed to react with excess of aqueous solution of KI. The reac- tion occurs as follows (unbalanced) KI + H₂O + O₂ → KOH + 1₂ + O₂ The liberated I, required 80 ml of sodium thiosulphate for titration. The 2 mass of H₂O₂ required to produce that much amount of O₂ which is present in given initial gaseous mixture. (Report the answer to the nearest integer)

Learning Goal: To use the equilibrium constant and Le Châtelier's principle to determine how a reaction will respond to external factors. A reaction is at equilibrium when the concentrations of the reactants and products no longer change over time. This does not mean the reaction is over; rather, two competing reactions continue to occur simultaneously at equal rates. The two competing reactions are the forward reaction (reactants → products) and the reverse reaction (products →→ reactants). If a reaction at equilibrium is subjected to a stress, the concentrations of reactants and products adjust to reestablish equilibrium. This is called Le Châtelier's principle. A stress might be a change in the concentration of reactants or products, a change in the volume of the reaction container, a change in temperature, or the addition of a catalyst. Given the concentrations, calculate the equilibrium constant for this reaction: PC13 (g) +Cl₂ (g) = PCL5 (g) At equilibrium, the molar concentrations for reactants and products are found to be [PC13] = 0.20 M, [Cl₂] = 0.25 M, and [PC15] 1.20 M. What is the equilibrium constant (Kc) for this reaction? Express your answer using two significant figures. ► View Available Hint(s) K = 24 Submit = Part B ✓ Correct Previous Answers [PC15] [PC13][Cl₂] The concentration of PC13 (g) is increased to 1.2 M, disrupting equilibrium. Calculate the new ratio of products to reactants with this higher concentration of phosphorus trichloride. Assume that the reaction has not yet regained equilibrium. Express your answer using two significant figures. ► View Available Hint(s) = Review | Constants | Periodic Table VAEO ?

What is true about covalent compounds? Select the correct answer below: They have the same properties as ionic compounds. O They are formed when one atom transfers an electron to another. O They are formed when atoms share electrons between each other. O They only form between metals.

If a solid line represents a covalent bond and a dotted line represents intermolecular attraction, which of the choices shows a hydrogen bond? [ HẠN…H-O-H H₂OH-CH3 H₂C......H-F H-H

A sample of xenon gas occupies a volume of 8.32 L at 475 K. If the pressure remains constant, at what temperature will this same xenon gas sample have a volume of 5.14 L? T = K

Concluding something with a lesson you have learned because of the experience you wrote about or the story you just described is an example of concluding with a mystery O concluding with a summary concluding with a personal comment

Question 10 (2 points) Suppose that three newly discovered elements, tellpunsnine (Tp), arcanine (Wf), and feline (Mw) have 5, 6, and 7 valence electrons, respectively_ Based on this information, identify the number of electron domains and the bond angle of the center atom in the structure for WfMw2. Electron domains: Bond angle: Blank 1: Blank 2:

Question 1 (1 point) The newly discovered element serpentine (Ss) can be combined with the newly discovered element draconine (Dr) to form the molecular compound SsDr4. A student suggests that this compound should be named monoserpentine tridraconide. Select ALL the following statements that apply to this suggestion. ☐a Ob C Od e f Og h A prefix was used for serpentine when it should not have been. A prefix was used for draconine when it should not have been. The wrong prefix was used for serpentine. The correct prefix was used for serpentine. The wrong prefix was used for draconine. The correct prefix was used for draconine. A prefix was not used for serpentine when it should have been. A prefix was not used for draconine when it should have been.

Expressing amounts of energy in different energy units is necessary to solve many chemistry problems. For practice, complete the following table. The Joule (J) is the SI unit of energy. 1 calorie (cal) = 4.184 J J 649 cal 178 kJ 0.866

A Honda Civic Hybrid weighs about 3000 lb. Y Submit Previous Answers Answer Requested Part B Calculate the mass of the car in kilograms. (Note: 1 kg on Earth's surface has a weight of 10 N). Express your answer to two significant figures and include the appropriate units.

when A business jet of mass 22000 kg takes off the thrust for each of two engines is 24000 N Part A Find its acceleration.

Suppose you have been handed 3 powdered solids, A, B, and C. Design of series of tests that you could use to determine the difference between each powder if you are told that one of them is ionic, one of them is metallic, and one of them is molecular. Justify your choice in procedures.

A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.65 atm, what is the partial pressure of nitrogen? The vapor pressure of water at 21 °C is 18.7 mm Hg.

Polyatomic ions are groups of tightly bonded atoms that behave like a monoatomic ion when bonding. How do the -ate versions of the ions differ form the -ite versions? the -ate versions of the anions have 1 more oxygen atom than the -ite versions the-ate and -ite versions have the same number of oxygen atoms the -ite versions of the anions have 1 more oxygen atom than the -ate versions some of the -ate version of the ion have two more oxygen atoms than the -ite versions of the anions

The extraction of aluminum metal from the aluminum hydroxide found in bauxite by the Hall-Héroult process is one of the most remarkable success stories of 19th century chemistry, turning aluminum from a rare and precious metal into the cheap commodity it is today. In the first step, aluminum hydroxide reacts to form alumina (Al₂O,) and water: 2Al(OH), (s) Al₂O, (s) + 3H₂O(g) In the second step, alumina (Al₂O3) and carbon react to form aluminum and carbon dioxide: 2Al₂O3(s) + 3C(s) 4Al(s) 3 CO₂ (g) Suppose the yield of the first step is 89.% and the yield of the second step is 80.%. Calculate the mass of aluminum hydroxide required to make 6.0 kg of aluminum. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.

A 25.0-mL sample of potassium chloride solution was found to have a mass of 25.225 g. After the solution was evaporated to dryness, the mass of the KCl residue was 1.396 g. Calculate the (a) mass/mass percent concentration, and (b) molarity of the solution.

In the chemical formula for binary compounds sometimes there are roman numerals. What does the roman numeral represent? the roman numeral indicates the number of anions in the formula the roman numeral indicates the number of cations in the formula the roman numeral represents the charge on the anion when the anion has more than one possible charge The roman numeral represents the charge on the cation when the cation has more than one possible charge

What is the role of a conclusion in a story? O It will have to provide a happy ending. O It should provide nothing other than a moral. It has to tie up all the loose ends created in the story.

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. In the first step, calcium carbide (CaC₂) and water react to form acetylene (C₂H₂) and calcium hydroxide: CaC₂ (s) + 2H₂O(g) C₂H₂(g) + Ca(OH)₂ (s) In the second step, acetylene (C₂H₂), carbon dioxide and water react to form acrylic acid (CH₂CHCO₂H): 6C₂H₂(g) + 3C0₂(g) + 4H₂O(g) → 5 CH₂CHCO₂H (g) 1 Suppose the yield of the first step is 63.% and the yield of the second step is 80.%. Calculate the mass of calcium carbide required to make 4.0 kg of acrylic acid. Be sure your answer has unit symbol, if needed, and is rounded to 2 significant digits.

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Ni and H+ in the balanced reaction? Show your work to get credit. Your work should include half reactions, balancing them individually, and putting them together to get a balanced equation. Ni+2(aq) + NH4+ (aq) → Ni(s) + NO3(aq)

3. 16.2 grams of ZnO are reacted with 45.0 mL of 6.0 M HCI solution. a) Write a balanced equation for the reaction. b) Which reactant is the limiting reagent? Must calculate. c) Calculate the theoretical yield (grams) of salt produced. d) If 0.105 moles of salt are produced, what is the % yield?

22. Consider the neutralization reaction H₂SO4 + 2 KOH 450 mL of a KOH solution with unknown concentration, what is the concentration of KOH? 2 H₂O + K2SO4. If there is 745 mL of 0.45 M H₂SO4 reacting with

1 Cu + 4 HNO3 Cu(NO3)2 + 2 H₂O + 2 NO2 a) How many grams of Cu(NO3)2 can be made from 25 grams of copper? 1 b) How many grams of NO2 can be made from 1.4 moles of copper? c) How many moles of H₂O can be made from 8.0 mL of 16 M HNO3? 2. How many grams of HCI are present in 45.0 mL of 12.0 M HCI solution?

A 35.6 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter that has a heat capacity of 23.3 kJ/°C. If the temperature rose from 35.0 °C to 76.0 °C, what is the value of AErxn (in kJ/mol ethanol)? C₂H5OH (1) + 3 O₂ (g) → 2 CO₂ (g) + 3 H₂O

When naming ionic compounds, you will need to use your periodic table of ions. When writing the formula, you write the ions for each and criss-cross the charges if they don't cancel out. Reduce them, if needed! For example: barium acetate APCIO, Write the names or formulas for the following compounds. Formula Name CaCO, Ni(CIO₂)2 KHCO, Caso AI(H₂PO₂), NaCl FROH For example: (NH4)₂CO3 Formula Ba(C,H,O₂) aluminum chlorate= Na₂SO4 (NH4)₂CO3 Ba(C₂H₂O₂)2 Mg3(PO4)2 Carbonate Nickel(1) ***Tip: Acetate can be written as C,H,O, or CH₂COO AI(CIO,), -1 Name Cesium orthosilicate Rubidium acetate Potassium Hydride Carbonate Beryllium bromate Cadmium Sulfite Sodium borate SbPO Li-S Na₂O₂ SnSO4 (NH) BO, Be(CIO₂)2 NH,OH Bismuth (III) sulfate Write the correct name for the following compounds and then tell the number of atoms present in each of the following formulas. Name Barium hydroxide Potassium oxide Silver sulfite Lead (II) acetate Barium phosphide. Calcium oxalate. Potassium sulfite Magnesium arsenate Antimony (V) nitrite N: 2 H: 8 C: 1 0:3 Total # of atoms = 14 Formula # of atoms

Which two atoms only need a duet (2) of valence electrons to become stable? Complete the blanks with proper element symbols. The atoms that need only 2 valence electrons to have a complete valence shell are type your answer... and type your answer..

What bond angle(s) is (are) present in the ficticious molecule AX4 if atom A is in group 4A (14) and atom X is in group 7A (17)? Only write a number or numbers separated by a comma. You do not need to include the degree symbol.

3. Complete each ionization reaction and then identify the conjugate acid/base pair from that ionization reaction. Note that each ionization reaction contains two conjugate acid/base pairs; these drop-downs are looking for the conjugate acid/base pair that does not involve water. a. b. C. d. Reactants HBr (aq) + H₂O (1) — HCIO4 (aq) + H₂O (1) — NH3 (aq) + H₂O (1) - H₂CO3(aq) + H₂0 (1) — Choose... Choose... Choose.. Choose... Choose... Choose... Choose... Choose... Products Conjugate Acid Choose... Choose... Choose.. Choose... Choose Choose... Choose.. Choose... Table view Conjugate Base Choose... Choose... - Choose... Choose... Choose... Choose... List view Choose.. Choose...

Draw the Lewis structure of CIBr, showing all lone pairs. Select Draw Rings More 10 3 Ć D 90° 109.5⁰ 120" 180" Br What are the approximate bond angles in CIBr,? Erase Q2Q Identify the molecular geometry of CIBr,.. square planar bent O tetrahedral octahedral O trigonal pyramidal see-saw O trigonal bipyramidal O square pyramidal trigonal planar O linear O T-shaped A CIBr, molecule is O polar. nonpolar.

Classify each reaction type: 1) MN + QP → QN + MP 2) CxHyOz + Oz - H2O + CO2 3) JRR+J 4) B+D 5) K+ EP 1 2 3 4 5 ->> BD - E + KP [Choose ] [Choose] synthesis single replacement double replacement decomposition triple replacement combustion [Choose ]

There are two steps in the extraction of copper metal from chalcocite, a copper ore. In the first step, copper(I) sulfide and oxygen react to form copper(1) oxide and sulfur dioxide: 2Cu₂S (s) + 30₂ (8) 2 Cu₂O(s) + 2 SO₂ (g) In the second step, copper(I) oxide and carbon react to form copper and carbon monoxide: Cu₂O(s) + C(s) 2Cu(s) + CO (g) - Suppose the yield of the first step is 89.% and the yield of the second step is 90.%. Calculate the mass of oxygen required to make 9.0 kg of copper. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.

As discussed in the live session, which type of chemical reaction is represented below? 2Mgl2 + Mn(SO3)2 --> 2MgSO3 + Mnl4 O double replacement O single replacement O synthesis O decomposition

Two ionic compounds (or an acid and a base) react to produce two new compounds. This best describes a reaction. MX+NP- O single replacement O double replacement synthesis Odecomposition O combustion

The mass of a starch packing peanut is 0.186 g. How much water (in g) would be needed to added to prepare a 3.04 % (w/w%) starch solution?

A) N₂ + B)______ KCIO3 NaCl + C) D) E) G) H) DA OB O C D DE C8H18 + FeCl3 + F)______P+_____0₂ → P₂O5 H₂O → OF DG 1 Na + OH H₂ H₂SO4 + - 1 KCI + NH3 02 F₂- _O₂ →_______CO₂ + NaOH → NaF + From the unbalanced reactions above, which ones are a type or rep double replacement)? Select the four correct answer. NaOH + Ba(NO3)2 - Cl₂ H₂O Fe(OH)3 + NaCl H₂ HNO3 + BaSO4

A solution is prepared by mixing 69.0 mL of a 0.196 M NaCl solution with 23.0 mL of a 0.294 M CaCl, solution. Determine the volume in milliliters of a 0.1111 M AgNO, solution needed to precipitate all of the Cl" as AgCl. volume AgNO3 = mL

Write the equilibrium-constant expression for the reaction A(s) + 3 B(l) -> 2 C(aq)+D(aq) in terms of [A], [B]. [C], and [D], as needed. Note that Ke, which is sometimes symbolized as Keq, denotes that the equilibrium constant is expressed using molar concentrations. For this question, Ke means the same thing as Keq. Kc =

The human body can get energy by metabolizing proteins, carbohydrates or fatty acids, depending on the circumstances. Roughly speaking, the energy it gets comes mostly from allowing all the carbon atoms in the food molecules to become oxidized to carbon dioxide (CO₂) by reaction with oxygen from the atmosphere. Hence the energy content of food is roughly proportional to the carbon content. Let's consider lysine (C6H₁4N2₂O₂), one of the amino acids from which proteins are made, and oleic acid (C₁8H3402), a fatty acid from which fats are made. Using the idea above about energy content, calculate the ratio of the energy the body gets metabolizing each gram of lysine to the energy the body gets metabolizing each gram of oleic acid. Round your answer to 2 significant digits.

Draw the Lewis structure of CH₂NH and then choose the appropriate pair of hybridization states for the two central atoms. Your answer choice is independent of the orientation of your drawn structure. - A) sp / sp² B) sp² / sp² C) sp² / sp³ D) sp³ / sp³ E) sp³ / sp

For each of the following, declare whether the paired species do or do not constitute a conjugate acid-base pair. HCIO4 and HCIO3 pair NH₂ and NH3 do not H₂CO3 and HCO3 do pair H3PO4 and H3PO3 pair do NO₂ and HNO₂ NH3 and NH4 H3O* and H₂O do do do do not H₂O and OH do > V constitute a conjugate acid-base constitute a conjugate acid-base pair constitute a conjugate acid-base constitute a conjugate acid-base constitute a conjugate acid-base pair constitute a conjugate acid-base pair constitute a conjugate acid-base pair constitute a conjugate acid-base pair

For the following reactions, indicate whether the following are examples of synthesis, decomposition, combustion, single displacement, or double displacement reactions. Na3PO4 +3KOH3NaOH + K3PO4 1)

The equilibrium system between nitrogen gas, oxygen gas, and nitrogen dioxide gas is given. N₂(g) +20₂ (g) = 2 NO₂(g) Write the balanced chemical equation for the reverse reaction. Include physical states for all species. chemical equation:

. Potassium ferricyanide reacts with sulfuric acid and water to produce potassium sulfate, Iron(III) sulfate, ammonium sulfate and carbon monoxide by the following balanced chemical reaction. a. K.Fe(CN) + 6 H₂SO4 + 6 H₂O → 2 K₂SO4 + FeSO, +3 (NH4)2SO4 +6 CO b. If 20 grams of K.Fe(CN), is reacted with 24.5 grams of H₂SO4, and 5 grams of H₂O which is the limiting reagent? c. Limiting reagent d. How many grams of CO will be produced? Grams e. If 5.2 grams of CO are produced, what is the % yield for the reaction? f. % yield

Reynolds, Glenn Harlan. "Glenn Reynolds: After Yale, Mizzou, raise the voting age - to Web. 27 June 2017. 25." USA Today. Gannett Satellite Information Network, What is missing from this MLA citation? O The author's first name The author's last name The date it was published

What mass of sodium chloride is produced when chlorine gas reacts with 0.29 grams of sodium iodide? The unbalanced equation is given below: Nal (s) + Ch (g) → NaCl (s) + I2 (g)

How many grams of calcium carbonate are formed if 25.0 mL of 0.560M calcium chloride and 32.4 mL of 0.489 M sodium carbonate are mixed together. The balanced reaction is given below. CaCl₂ (aq) + Na₂CO3(aq) a. What is the limiting reagent? b. How many grams of CaCO3 will be produced? - CaCO3(s) + 2 NaCl(aq)

If a solution containing 24.25 g of lead(II) acetate is allowed to react completely with a solution containing 7.410 g of sodium sulfate, how many grams of solid precipitate will be formed? mass of solid precipitate: How many grams of the reactant in excess will remain after the reaction? mass of excess reactant: