General Questions and Answers

Type your answers in all of the blanks and submit 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% yield = reaction was only 75%? 12.804 Excess reagent left over after the reaction with 75% yield = You are correct Now consider how many grams of excess reagent are left over after the reaction has run to completion if the percent yield of the 9.618 You are incorrect grams X grams

Identify the type of context clue used to identify the meaning of the underlined word. Cindy detests, that is she dislikes intensely the thought of reciting her poem in front of the entire school. Antonym Definition Synonym

Suppose there is Avogadro's number of mini marshmallows and they are used to cover the province of Manitoba, which has a land area of 5.536 x 105 km². Each mini marshmallow has a diameter of 0.635 cm and a height of 2.54 cm. Assuming the marshmallows are packed together so there is no space between them, to what height above the surface, in kilometers, will the mini marshmallows extend?

Suppose a sample of butane (C4H₁0) contains 193 g of carbon (C). Use unit analysis to calculate the mass of the butane sample. Set up the unit analysis by dragging the necessary components into the conversion factor slots. 193 g Cx X E X

7. Write the equilibrium constant expression for each of the following reactions: (3 pts)) 4014 (a) 2TiCl3(s) + 2HCl(g) 2TICI4(s) + H₂(g) SLA (b) CH4 (g) + 2H₂S(g) CS₂ (g) + 4H2(g) (c) Ag2C₂O4 (s) —2Ag* (aq) + C₂0₁² (aq) youinel

The balanced chemical equation for the reaction is: 2+ 3+ 2+ 8H* (aq) + 5Fe²+ (aq) + MnO (aq) 5Fe³+ (aq) + Mn²+ (aq) + 4H₂0 (1) What kind of reaction is this? - 1 If you said this was a precipitation reaction, enter the chemical formula of the precipitate. If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base. If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized. Calculate the mass percent of Fe in the sample. Be sure your answer has 3 significant dinits Oprecipitation acid-base redox 7 %

Exactly 10.0 gram of a solute was added to a graduated cylinder containing 80.00 mL of water. What is mass percent of the solute in this mixture to 3 significant figures? 11.1% 10.0% 11.0% 13.0% 12.5%

Aluminum reacts with oxygen to form aluminum oxide, Al₂O₂. Set up the calculation and solve for the mass ratio of aluminum to oxygen in this compound. mol Al x mol O x 4 26.981 g/mol Answer Bank 47.997 g/mol 5 53.962 g/mol 1 101.96 g/mol 3 = mass ratio 2 15.999 g/mol mass ratio=

Aluminum reacts with oxygen to form aluminum oxide, Al₂O3. Set up the calculation and solve for the mass ratio of aluminum to oxygen in this compound. 2 3 mol Al x mol O x 26.981 g/mol 15.999 g/mol = mass ratio mass ratio= 1.62 Incorrect

Consider the following reaction: Fe + Br2 FeBr₂ If 53.2 grams of iron react with an excess of bromine gas, what mass of FeBr₂ can form? (FeBr2 = 215.65 g/mol) a) 13.8 g b) 205 g c) 226 g d) 4.41 x 10-3 bo

▼ H₂O CH3OH(1) CH₂OH(aq) O strong O weak Ononelectrolyte Submit Request Answer Part B MgCl₂ (s) ₂, Mg2+ (aq) + 2Cl(aq) O weak Ononelectrolyte Ostrong

Write the net ionic equation to show the formation of a precipitate (insoluble salt) when the following solutions are mixed. Write noreaction if there is no precipitate. ▼ NaNO3(aq) and KBr(aq) Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed. Submit AΣO A chemical reaction does not occur for this question. Part C Request Answer ? K₂SO4 (aq) and Ca(NO3)2 (aq) Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed. AΣO Submit Request Answer ? A chemical reaction does not occur for this question.

In this reaction, ZnBr₂ (aq) + K₂CO3 (aq) → 2 KBr (aq) + ZnCO3 (s) all of the zinc (II) bromide is consumed and some potassium carbonate is left over. The ZnBr₂ is called the a) product. b) precipitate. c) limiting reagent. d) excess reagent.

Write the net ionic equation to show the formation of aprecipitate (insoluble salt) when the following solutions are mixed. Write noreaction if there is no precipitate. AgF(aq) and KBr(aq) Express your answer as a chemical equation. Identify all of the phases in your answer. NaNO3(aq) and KBr(aq) Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed.

Suppose a sample of butane (C₂H₁) contains 193 g of carbon (C). Use unit analysis to calculate the mass of the butane sample. up the unit analysis by dragging the necessary components into the conversion factor slots. Set 193 g Cx 1 mol C₂H₁0 12.01 g C 1 mol C X 58.12 g C₂H₁0 1 mol C₂H₁0 10 mol H Answer Bank 4 mol C 4 mol C X 10 mol H 1 mol C 12.01 g C 1.01 g H 58.12 g C₂H₁0

Consider the reaction of copper(II) oxide with aluminum metal to produce copper metal and aluminum oxide: 3 CuO(s) + 2 Al(s) → 3 Cu(s) + Al2O3(s) - If 1.69x1023 atoms Al react with an excess of CuO, what mass of Al2O3(s) is produced? Assume the reaction goes to 100% completion. Enter your response in decimal notation to three significant figures.

Why do the noble gases have basically no electron affinity? They already have full valence shells of electrons, so they gain more electrons They already have full valence shells of electrons, so they do not change energy if they gain more electrons They already have full valence shells of electrons, so they lose electrons They already have full valence shells of electrons, so they do not gain more electrons

Calculate the reaction entropy (A S rxn) for the following reaction: 2 LIOH + CO2LI₂CO3 + H₂O (A) -113.4 J/mol K B) 200.6 J/mol K C) 364 J/mol K D) 313.8 J/mol K

In a certain reaction, Fe and O₂ combine to form iron(III) oxide. 33.5 moles of Fe and 23.2 moles of O₂ are placed in a container and the reaction proceeds with 100% yield. Note: Both answers must be correct for the question to be scored as correct Which is the excess reactant? O iron oxygen What is the amount of excess reactant left when the reaction reaches completion? Provide your answer in decimal notation rounded to 1 decimal digit. Enter Value moles are left over.

Identify which of these molecules has the highest boiling point and give the reasoning why in terms of intermolecular force. H₂O, KCI, CO₂ KCI has the highest boiling point Boiling point is in the order KCI>H2O>CO2 in KCI inter molecular force is ionic bond. That is formed by compleate tranfer of electrons. Hence break the bond is very difficult. Hence boiling point is higher. H2O has hydrogen bond hence its boiling point is higher than that of CO2)

Identify the spectator ions in the following molecular equation. KBr(aq) + AgNO3(aq) → AgBr(s) +KNO3(aq) Ag+ and Br K+ and NO3 K+ and Br Ag+ and NO3 There are no spectator ions in this reaction.

How many liters of a 0.0550 M KCI solution contain 0.163 moles of KCI?

Calculate the molecular weights for NH3 and SF6. How many grams of \(\ce {NH_3}\) are needed to provide the same number of molecules as in \(0.45\) g of \(\ce{SF_6}\)?

6. True or False A solution of a strong electrolyte will always have a higher conductivity than a solution of a weak electrolyte. A solution of a strong electrolyte will always have a higher conductivity than a solution of a non-electrolyte. A beaker contains a solution that has a low to medium conductivity reading. Is it appropriate to conclude that the solution contains a weak electrolyte? Explain.

Chalk is a mixture of CaCO3 and CaSO4. When added to HCI, only the CaCO3 reacts according to the reaction: CaCO3(s) + 2 HCI (aq) → CaCl₂ (aq) + CO₂(g) + H₂(1) When a 7.54 g piece of chalk is placed in HCI, 2.68 of CO2 is produced. What percentage of the chalk is CaCO3? 41.2% 80.8% 61.9 % 59.1 % 37.3 %

Identify the literary device/figurative language from the following statement: "Out in the porch's sagging floor, Leaves got up in a coil and hissed, Blindly struck at my knee and missed." Hyperbole Metaphor Similar

Bituminous coal is a type of coal that is composed of carbon with small amounts of hydrogen, oxygen, nitrogen, and sulfur. The formula for a sample of bituminous coal is C₁37H97O,NS. Calculate the amount of carbon in 65.0 kg of the sample. mass: kg C

Calculate the enthalpy change for the reaction: P4O6(s) +2O₂(g) →→ P4O10(s) given the following enthalpies of reaction: P4(s) + 3O₂(g) → P4O6(s) ΔH = -1640.1 kJ P4(s) + 5O₂(g) → P4O10(s) ΔH = -2940.1 kJ

If 12.3 g of aluminum carbonate (233.99 g/mol) is dropped into a solution that contains an excess of sulfuric acid, what is the percent yield if 4.52 g of carbon dioxide is recovered? 3 H₂SO4(aq) + Al(CO₂)→ Al₂(SO)(aq) + 3 CO2(g) + 3 H₂O(l)

75.00 g of compound A (molar mass = 84.72 g/mol) and 13.17 g compound B (molar mass = 74.4 g/mol) react completely to form 14.85 g compound C (molar mass = 41.89 g/mol) and 73.32 g compound D (molar mass = 103.56 g/mol) with neither reactant in excess. What is the coefficient for compound A in the chemical equation for this reaction when balanced in lowest whole-numbers?

06 > A patient is having an allergic reaction and takes a 12.5 mg tablet of the over-the-counter antihistamine diphenhydramine hydrochloride, C17H22CINO. How many molecules of diphenhydramine hydrochloride are in this tablet? molecules:

Aluminum metal can be recycled from scrap metal by melting the metal to evaporate impurities. (a) Calculate the amount of heat needed to purify 1.00 mole of Al originally at 298 K by melting it. The melting point of Al is 933 K. The molar heat capacity of Al is 24 J/(mol-K), and the heat of fusion of Al is 10.7 kJ/mol. (b) The equation for the overall process of extracting Al from Al-O, is shown below. Which requires less energy, recycling existing Al or extracting Al from Al-O,? Justify your answer with a calculation. Al₂0,(s) → 2 Al(s) + 0₂ (8) AH = 1675 kJ/mol,

The atom ratio in the compound nickel(II) phosphide has been found to be 0.667 atoms P atom Ni What is the mole ratio for this compound? mole ratio: Give the empirical chemical formula for nickel(II) phosphide by adding the necessary subscripts. empirical formula: NiP What is the mass ratio of P to Ni in nickel(II) phosphide? mass ratio: mol P/mol Ni g P/g Ni

Identify the literary device/figurative language used in the following lines from "A Red, Red Rose" by Robert Burns. "O my Luve's like the melodies, That's sweetly play'd in tune." O Hyperbole Similar O Metaphor

NaNO3(aq) and KBr(aq) Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed.

You may want to reference (Page) Section 12.3 while completing this problem. Determine whether a solid forms when solutions confaining the following salts are mixed. ▼ Part G ▼ Enter the complete ionic equation when BaCl2 and KOH are mixed. Express your answer as a complete ionic equation. Identify all of the phases in your answer. Enter noreaction if no reaction occurs. ionic equation: A chemical reaction does not occur for this question. Submit AΣO Part H Request Answer Review I Constants I Periodic Table ? Enter the net ionic equation when BaCl2 and KOH are mixed. Express your answer as a net ionic equation. Identify all of the phases in your answer. Enter noreaction if no reaction occurs.

Determine the mass in milligrams of 0.402 mol NH CI. mass: Determine the mass in milligrams of 81.3 mmol H₂SO4. mass: mg NHẠCI mg H₂SO4

A scuba diver takes a 2.3 L balloon from the surface, where the pressure is 1.0 atm and the temperature is 35 °C, to a depth of 35 m, where the pressure is 4.5 atm and the temperature is 14 °C. What is the volume of the balloon at this depth? Express your answer in liters to two significant figures.

What is the formula for ammonium sulfide? Capitalization and punctuation count. ammonium sulfide How many hydrogen atoms are in 2.00 mol of ammonium sulfide? H atoms

Write a balanced half-reaction describing the reduction of gaseous dichlorine to aqueous chloride anions. la 00 0 2. X S ?

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S and Fe(NO3)2 are mixed. OK+ (aq) + NO3(aq) → KNO3(s) Fe²+ (aq) + S2 (aq) + 2 K+ (aq) + 2 NO3(aq) → FeS(s) + 2 K+ (aq) + 2NO3(aq) Fe²+ (aq) + S²-(aq) + 2 K+ (aq) + 2 NO3(aq) → Fe2+ (aq) + S2-(aq) + 2 KNO3(s) Fe²+ (aq) + S2 (aq) → FeS(s) - No reaction occurs.

Perform each pressure conversion. 24.9 psi to millimeters of mercury Express your answer using three significant figures. 32.79 in. Hg to torr Express your answer using four significant figures.

Choose the correct answer. The most common purpose of a thesaurus is Oto avoid repeating the same word in your writing to impress readers with your knowledge of synonyms to impress readers with your knowledge of antonyms All of the choices

Why do some people find it easier and quicker to use online dictionaries instead of print dictionaries? All of the choices Online dictionaries contain less information than print dictionaries. It can be easier and quicker to find words because you can just type them in instead o searching for them in alphabetical order. O Online dictionaries are written more simply and are easier to understand.

MISSED THIS? Read Section 11.3. You can click on the Review link to access the section in your eText. The pressure in Denver, Colorado (5280-ft elevation), averages about 24.6 in. Hg. Convert this pressure to pounds per square inch. P = Submit Part D D P = VAΣo Convert this pressure to pascals. Request Answer D VAZO ? ? psi Pa

What are the 3 interactions that happens in a solution between the solute and the solvents? Describe the interactions in terms of salt dissolved in water. 1) Solute-solute interaction (x-x): They are the intermolecular force of attraction between Solute particles only. Hence Solute binds other solute molecules. 2) Solute - Solvents interaction(x-y): it is known as solvents. When salt(NaCl) is dissolved in water It dissociates in ion of Na+ and Cl- and they both are surrounded by water molecules due to this interaction. (Na+ by negative dipole of oxygen and Cl- by positive dipole of water 3) Solvents-Solvents interaction(y-y): They are intermolecular force of attraction between solvents particles only. Hence solvents binds other solvents molecules. In case of salt and water Solute-Solvent forces are very much stronger. So they dissolves easily.

The following appears to be an entry from a Narrow adjective being of less than usual width <found a narrow opening in the fence that he was able Synonyms fine, hairline, needlelike, paper-thin, skinny, slender, slim, slim-jim, thin, ultrathin Antonyms broad, fat, wide dictionary glossary Othesaurus

Sulfurous acid (H₂SO3) is a polyprotic acid. Write balanced chemical equations for the sequence of reactions that sulfurous acid can undergo when it's dissolved in water.

Consider the following balanced equation: 16HCl(aq) + 2KMnO4(aq) → 5Cl2(g) + 8H₂O(l) + 2KCI(s) + 2MnCl₂(aq) If 35.4 moles of HCl(aq) and 7.63 moles of KMnO4(aq) are allowed to react to produce 13.4 moles of H₂O(l), what is the percent yield of the reaction? Provide your answer in decimal notation, rounded to 1 decimal digit.

If ammonia can be produced from calcium oxide and ammonium chloride according to the following reaction. If 17.6 g of calcium oxide is used in the reaction and 7.43 g of ammonia is recovered, what is the % yield of the reaction? CaO(s) + 2 NH4Cl(s)→ 2 NH3(g) + CaCl₂(s) + H₂O(g)