Chemistry concepts and calculations
117302 questions • Page 2157 / 2347
a) In a chemical reaction one mole of gas reacts with a liquid generating anothe
a) In a chemical reaction one mole of gas reacts with a liquid generating another liquid and one mole of another gas. Would you expect DS to be positive, negative, or close to zer…
a) In a neutralization reaction, NaOH (aq) reacted with HCl (aq) at 21.01 o C to
a) In a neutralization reaction, NaOH(aq) reacted with HCl(aq) at 21.01oC to produce 80g of NaCl solution at 24oC. Calculate (q) the heat of solution in Joules. (s = 4.184 J/oC.g)…
a) In an isolation of caffeine from tea experiment, students try to find out the
a) In an isolation of caffeine from tea experiment, students try to find out the ratio of grams of caffeine per gram of black tea leaves.However most of the students find lower ra…
a) In any chemical fabrication process (eg. wet etching or CVD) there are two ma
a) In any chemical fabrication process (eg. wet etching or CVD) there are two main regions where the reaction rate is dominated by different processes. Name them and explain what …
a) In each pair, indicate which the better leaving group (weaker base) is. You w
a) In each pair, indicate which the better leaving group (weaker base) is. You will need to consult table 4.1 on page 165 in your textbook. will need to remember periodic trends i…
a) In each pair, indicate which the better leaving group (weaker base) is. You w
a) In each pair, indicate which the better leaving group (weaker base) is. You will need to consult table 4.1 on page 165 in your textbook. will need to remember periodic trends i…
a) In ethylbenzene solvent, chlorine radicals can react in two different ways: a
a) In ethylbenzene solvent, chlorine radicals can react in two different ways: abstraction of ethylbenzene's benzyl hydrogens or abstraction of one of the primary hydrogens. It ha…
a) In procedure 1: assume four different capacitors are connected in series to a
a) In procedure 1: assume four different capacitors are connected in series to a battery. - The potential difference across the capacitors is greatest for the smallest capacitance…
a) In procedure 1: assume four different capacitors are connected in series to a
a) In procedure 1: assume four different capacitors are connected in series to a battery. - The potential difference across the capacitors is greatest for the smallest capacitance…
a) In reverse osmosis, water flows out of a salt solution until the osmotic pres
a) In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 65.0 bar is applied to seawater,…
a) In the balanced equation for the combustion of 2,2,4-trimethyloctane (C11H24)
a) In the balanced equation for the combustion of 2,2,4-trimethyloctane (C11H24), the coefficient of the organic compound is______ , the coefficient of oxygen gas is_____ , the co…
a) In the double displacement reaction between chromium (III) nitrate and ammoni
a) In the double displacement reaction between chromium (III) nitrate and ammonium carbonate, the molecular formula of chromium (III) nitrate is____ , the molecular formula of amm…
a) In the human body the glycogen is broken down into glucose by the action of s
a) In the human body the glycogen is broken down into glucose by the action of specific enzymes. Due to the deficiency of these enzymes the breakdown of glycogen doesn’t take plac…
a) In the mass spectra, why do peaks for the molecular ions of the bromotoluene
a) In the mass spectra, why do peaks for the molecular ions of the bromotoluene isomers appear at 170 and 172 instead of 171? b) Given the shapes of the products and the Na-Y cavi…
a) Into a separatory funnel is poured 50 mL of CH3CH2Br (bromoethane), a water-i
a) Into a separatory funnel is poured 50 mL of CH3CH2Br (bromoethane), a water-insoluble compound with a density of 1.460 g/mL, and 50 mL of water. The funnel is stoppered and the…
a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nuc
a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nucleus that absorbs at 3.25 ?? b)Does the nucleus that absorbs at 0.90 ? require a stronger applied f…
a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nuc
a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nucleus that absorbs at 3.25 ?? b)Does the nucleus that absorbs at 0.90 ? require a stronger applied f…
a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nuc
a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nucleus that absorbs at 3.25?? less shielded more shielded ? Does the nucleus that absorbs at 0.9…
a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nuc
a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nucleus that absorbs at 3.25 ?? less shielded more shielded Does the nucleus that absorbs at 0…
a) Is a nucleus that absorbs at 2.2 more shielded or less shielded than a nucleu
a) Is a nucleus that absorbs at 2.2 more shielded or less shielded than a nucleus that absorbs at 5.14 ? Does the nucleus that absorbs at 2.2 require a stronger applied field or a…
a) Is the process of KNO3 dissolving in water spontaneous at all temperatures st
a) Is the process of KNO3 dissolving in water spontaneous at all temperatures studied? Briefly explain. b) Is the reaction in (a) one that gives off heat or requires heat? Briefly…
a) It is a triprotic acid. n = 3. At half equivalence point, pH = pKa1 = 3 Ka1 =
a) It is a triprotic acid. n = 3. At half equivalence point, pH = pKa1 = 3 Ka1 = 10-3 At one and a half equivalence point, pH = pKa2 = 7 Ka2 = 10-7 At two and a half equivalence p…
a) Khloe Kardashian just bought a new cellphone case with silver accents. But is
a) Khloe Kardashian just bought a new cellphone case with silver accents. But is it real silver? The mass of the accents was 13.89 g, warmed to 24.62°C and submerged into 5.2 g of…
a) Label the following reactions as spontaneous or nonspontaneous: creatine phos
a) Label the following reactions as spontaneous or nonspontaneous: creatine phosphate + H2O creatine + Pi …
a) Lipitor, a pharmaceutical drug that has been shown to lower \"bad\" cholester
a) Lipitor, a pharmaceutical drug that has been shown to lower "bad" cholesterol levels while raising "good" cholesterol levels in patients taking the drug, had over $11 billion i…
a) List at least three crystal allotropes (or structures) of carbon. b) What is
a) List at least three crystal allotropes (or structures) of carbon. b) What is the nature of the bonding in thesethreedifferent carbon materials? Include a description of bond hy…
a) Mark which of the following statements are true. For a pure substance, the sl
a) Mark which of the following statements are true. For a pure substance, the slope of the liquid-solid coexistence curve in the P vs T diagram is positive if the solid has a lowe…
a) NH 3................................ , H 2 O ................... , OH - .....
a) NH3................................, H2O................... , OH-.........................., HCl b) CH3COOH..... CH2ICOOH......... CHCl2COOH............ CH2ClCOOH c) HFO3......…
a) Name three things, related to the polymer chains (excluding positioning of si
a) Name three things, related to the polymer chains (excluding positioning of side groups) and their packing, that has a strong affect on the mechanical properties of a in bulk fo…
a) Nanoribbons are nano strips of material which is made up of long chain of one
a) Nanoribbons are nano strips of material which is made up of long chain of one type of atoms. If it is a carbon atom, then nanoribbons are called as graphene nanoribbons. Simila…
a) Nickel (II) chloride dissolves in water to form a lightgreen solution. What s
a) Nickel (II) chloride dissolves in water to form a lightgreen solution. What species (ions) are present in solution i.e.,what is "swimming around" in the aqueous solution? writh…
a) Of the following four choices, which is the best reducing agent? i) Ag+ ii) A
a) Of the following four choices, which is the best reducing agent? i) Ag+ ii) Ag iii) Cu2+ iv) Cu b) Cars of the future may make use of Hydrogen powered fuel cells. Two possible …
a) One mole of ice is warmed from 220 K to 300 K at constant pressure of 1 bar.
a) One mole of ice is warmed from 220 K to 300 K at constant pressure of 1 bar. Find the enthalpy change (delta H) for this process. b) If we assume that the volume of the ice/wat…
a) One mole of ice is warmed from 220 K to 300 K at constant pressure of 1 bar.
a) One mole of ice is warmed from 220 K to 300 K at constant pressure of 1 bar. Find the enthalpy change (delta H) for this process. b) If we assume that the volume of the ice/wat…
a) Pb3(PO4)2 is an ionic compound with very low solubility (ksp=1.0x10^-54. WEri
a) Pb3(PO4)2 is an ionic compound with very low solubility (ksp=1.0x10^-54. WErite a balanced chemical equation to describe dissolving solid Pb3(PO4)2 in pure water. b) Pb2+ and O…
a) Pb3(PO4)2 is an ionic compound with very low solubility (ksp=1.0x10^-54. WEri
a) Pb3(PO4)2 is an ionic compound with very low solubility (ksp=1.0x10^-54. WErite a balanced chemical equation to describe dissolving solid Pb3(PO4)2 in pure water. b) Pb2+ and O…
a) Phosphate can be determined spectrophotometrically by using the molybdenum bl
a) Phosphate can be determined spectrophotometrically by using the molybdenum blue method. A 2.00 mL urine sample is treated with molybdenum blue reagents and diluted to 100. mL. …
a) Propane is typically used for gas grills. Write a balanced combustion reactio
a) Propane is typically used for gas grills. Write a balanced combustion reaction for propane (CH_3 CH_2 CH_3) and calculate the enthalpy of reaction at standard conditions. Note …
a) Qualitatively predict whether the reaction will be product or reactant favore
a) Qualitatively predict whether the reaction will be product or reactant favored. b) Use your data to verify your prediction. Calculate the value of equilibrium constant for this…
a) Refrigerators and freezers remove heat from food by evaporating volatile liqu
a) Refrigerators and freezers remove heat from food by evaporating volatile liquids such as CF4 and then recompressing the vapor back into a liquid. Calculate what mass of water a…
a) Regarding HPLC, explain specifically why it is vital that the mobile phase (C
a) Regarding HPLC, explain specifically why it is vital that the mobile phase (Carrier) is either held under a slight vacuum or is purged with helium gas before entering the …
a) Select 4 molecules that carry out SN1 b) Select 4 molecules that carry out SN
a) Select 4 molecules that carry out SN1 b) Select 4 molecules that carry out SN2 c) Select 4 molecules that have resonance when forming carbocations with resonance. Write the mec…
a) Select 4 molecules that carry out SN1 b) Select 4 molecules that carry out SN
a) Select 4 molecules that carry out SN1 b) Select 4 molecules that carry out SN2 c) Select 4 molecules that have resonance when forming carbocations with resonance. Write the mec…
a) Select all of the correct statements about reaction rates from the choices be
a) Select all of the correct statements about reaction rates from the choices below. The lower the rate of a reaction the longer it takes to reach completion. Catalysts increase r…
a) Select all of the correct statements about reaction rates from the choices be
a) Select all of the correct statements about reaction rates from the choices below. The lower the rate of a reaction the longer it takes to reach completion. The higher the rate …
a) Select all of the correct statements about reaction rates from the choices be
a) Select all of the correct statements about reaction rates from the choices below. The lower the rate of a reaction the longer it takes to reach completion. Catalysts increase r…
a) Select all of the correct statements about reaction rates from the choices be
a) Select all of the correct statements about reaction rates from the choices below. a) The lower the rate of a reaction the longer it takes to reach completion. b) Reaction rates…
a) Select all of the correct statements about the relative acid strengths of pai
a) Select all of the correct statements about the relative acid strengths of pairs of acids from the choices below. HCl is a stronger acid than H2S because Cl is more electronegat…
a) Select all of the correct statements about the relative acid strengths of pai
a) Select all of the correct statements about the relative acid strengths of pairs of acids from the choices below. HCl is a stronger acid than H2S because Cl is more electronegat…
a) Select the correct description for each region. (The red X and green check wi
a) Select the correct description for each region. (The red X and green check will not be given for part a.) Region O 1 Region K 2 Region M 3 Region N 4b) Write the capital letter…
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