Chemistry concepts and calculations

1. Which salt will precipitate first upon addition of AgNO3 to a solution contai

1. Which salt will precipitate first upon addition of AgNO3 to a solution containing Cl- and I-? A. AgCl, Ksp=1.8X10^-10 B. AgI, Ksp=8.5X10^-17 2. The amount of chloride in a wate…

1. Which set describes an atom of 60Ni? (A) 32 electrons, 32 neutrons, and 28 pr

1. Which set describes an atom of 60Ni? (A) 32 electrons, 32 neutrons, and 28 protons (B) 30 electrons, 30 neutrons, and 30 protons (C) 28 electrons, 32 neutrons, and 28 protons (…

1. Which silver halide precipitate(s) dissolved when sodium thiosulfate was adde

1. Which silver halide precipitate(s) dissolved when sodium thiosulfate was added? A. silver chloride only B. silver fluoride and silver chloride C. silver bromide and silver chlo…

1. Which solution has the lower freezing point, 1.0 M KBr or 1.0 M CaBr? 2. What

1. Which solution has the lower freezing point, 1.0 M KBr or 1.0 M CaBr? 2. What would be the boliling points of the solutions in Exercise 1? 3. Which solution has the higher boil…

1. Which solution has the lower freezing point, 1.0 M KBr or 1.0 M CaBr? 2. What

1. Which solution has the lower freezing point, 1.0 M KBr or 1.0 M CaBr? 2. What would be the boliling points of the solutions in Exercise 1? 3. Which solution has the higher boil…

1. Which statement about a sigma bond is not true? A. It can form from the inter

1. Which statement about a sigma bond is not true? A. It can form from the interaction of a 1s and a 2p orbital. D. It does not involve actual bond overlap. 2. A. It is formed by …

1. Which statement about oxidation numbers (or states) is not true? D. The oxida

1. Which statement about oxidation numbers (or states) is not true? D. The oxidation number gives you insight into where the electron rich and electron deficient areas (relative t…

1. Which statement below correctly describes the reaction shown? Br Br Br CH3 CH

1. Which statement below correctly describes the reaction shown? Br Br Br CH3 CH3 NaCN CH3OH SN2 reaction a. A is fastest, B is slowest b. B is fastest, C is slowest c. C is faste…

1. Which statement below is true about the purpose of an acid catalyst in nucleo

1. Which statement below is true about the purpose of an acid catalyst in nucleophilic acyl substitution reactions? A. The acid protonates the carbonyl carbon to make the oxygen a…

1. Which statement is false? (a) The density of a gas is constant as long as its

1. Which statement is false? (a) The density of a gas is constant as long as its temperature remains constant. (b) Gases can be expanded without limit. (c) Gases diffuse into each…

1. Which statement of carbon nmr is not true? a) only the 1.1% of 13c present in

1. Which statement of carbon nmr is not true? a) only the 1.1% of 13c present in organic molecules, and not the 98.9% of 12c, is observable by nmr. b) carbon-carbon coupling in th…

1. Which statement regarding the chemiocmotic theory is NOT true? a. it is depen

1. Which statement regarding the chemiocmotic theory is NOT true? a. it is dependent on an inner mitochondrial membrane that is not very permeable b. the electron transport chain …

1. Which statement supports the electron-sea model for metallic bonding? A. Meta

1. Which statement supports the electron-sea model for metallic bonding? A. Metals are not very good conductors of electricity. B. Metals have low thermal conductivity. C. Metals …

1. Which subshell has only tive örbitals a.2 d. 3 2. Atomic spectra are due to t

1. Which subshell has only tive örbitals a.2 d. 3 2. Atomic spectra are due to the changes in the energy of electrons. a. protons. b. neutrons. c. nuclei. e. electromagnetic radia…

1. Which substance has dipole-dipole forces? A.) CBr4 B.) SO3 C.)CHCl3 D.) F2 2.

1. Which substance has dipole-dipole forces? A.) CBr4 B.) SO3 C.)CHCl3 D.) F2 2. What kinds of intermolecular forces are present in a mixture of calcium bromide and water? D.) dis…

1. Which substance is NOT an aldehyde? D (B) NH (C) 2. Which substance produced

1. Which substance is NOT an aldehyde? D (B) NH (C) 2. Which substance produced the following infrared spectrum BELOW, LEFT)? (A) benzoic acid (B) benzaldehyde (C) dipherylketone …

1. Which type of solid is held together by relatively weak dispersion forces? A.

1. Which type of solid is held together by relatively weak dispersion forces? A. ionic solid B. metal C. molecular solid D. ceramic E. semiconductor 2. Ionic solids have ________ …

1. Which types of organic compounds are soluble in weak base: phenols hydrocarbo

1. Which types of organic compounds are soluble in weak base: phenols   hydrocarbons carboxylic acids   2. a. phenols   b. hydrocarbons c. carboxylic acids   What would happen if …

1. Which types of organic compounds are soluble in weak base: phenols hydrocarbo

1. Which types of organic compounds are soluble in weak base: phenols   hydrocarbons carboxylic acids   2. a. phenols   b. hydrocarbons c. carboxylic acids   What would happen if …

1. Which weak acid yields a buffer solution closest tp neutral pH when paired wi

1. Which weak acid yields a buffer solution closest tp neutral pH when paired with an equal concentration of its conjugate base? (A) acetic acid (K, 18x10 (C boric acid (K. 5Ax10 …

1. Which will most likely be a successful synthesis of an organometallic compoun

1. Which will most likely be a successful synthesis of an organometallic compound? A. CH3CH2CH2MgBr + LiCl >>>>>>>>> CH3CH2CH2Li + MgBrCl B. 2 CH3CH2CH2…

1. Which would be a safety concern when handling the sodium hydroxide solution u

1. Which would be a safety concern when handling the sodium hydroxide solution used in this experiment? a. do not mix with water b. keep away from open flames c. wear lab gloves d…

1. Which would have a higher surface tension, H2O or C6H14? Why? Would the shape

1. Which would have a higher surface tension, H2O or C6H14? Why? Would the shape of the H2O meniscus in a glass tube be the same or different than C6H14? 2. Does Fe form a molecul…

1. While doing an experiment with volatile materials inchemistry lab, your appar

1. While doing an experiment with volatile materials inchemistry lab, your apparatus blows up with a bright flash oflight. There just happened to be a phonometer turned on in the …

1. Why MgCl 2 is an inonic bond? According to the electronegativity table, an el

1. Why MgCl2 is an inonic bond? According to the electronegativity table, an electronegativity difference between Cl 3.0 and Mg 1.2 is 1.8 and it's between 0.5~1.9 value so I thin…

1. Why are 1-bond 1H - 13C couplings usually not observed in 1H NMR spectra? 2.

1. Why are 1-bond 1H - 13C couplings usually not observed in 1H NMR spectra? 2. 1H has a) one spin state, b) two spin states, c) three spin states 3. if the intensity of an M+2 pe…

1. Why are certain molecules chosen for food dyes? Look at the chemical structur

1. Why are certain molecules chosen for food dyes? Look at the chemical structures in Table 1 and explain how and why these molecules make good dyes. 2. What was the color of the …

1. Why are the effects of enantiomers so different? 2.What is importance of chir

1. Why are the effects of enantiomers so different? 2.What is importance of chiral chemistry on pharmacology and new drug development? 3. find at LEAST three examples of pharmacol…

1. Why didn\'t you need to know the molar absorptivity of the equilibrium mixtur

1. Why didn't you need to know the molar absorptivity of the equilibrium mixture or the path length for the calculation you did in this experiment? 2. For each determination of th…

1. Why do electron withdrawing groups on a benzene ring direct substitution to m

1.  Why do electron withdrawing groups on a benzene ring direct substitution to mostly the meta position? a) Meta positions are always more reactive  b) Intermediate from meta att…

1. Why do plants invest so much energy in reproduction? 2. How is seed plant rep

1. Why do plants invest so much energy in reproduction? 2. How is seed plant reproduction adaptaed to terrestrial environment? -How successful are those adaptations? How well have…

1. Why do the pH and protease rankings differ between fresh fruits but are simil

1. Why do the pH and protease rankings differ between fresh fruits but are similar for cooked fruits? 2. Knowing proteases after the appearance of the milk, explain why canned jui…

1. Why does CH 2 Cl 2 solvent (lower layer) have higher density than water while

1. Why does CH2Cl2 solvent (lower layer) have higher density than water while non-chlorinated solvents like hexanes and ether (top layer) have lower density than water, i.e. what …

1. Why does E. coli need both DNA polymerase III and DNA polymerase I? a. The DN

1. Why does E. coli need both DNA polymerase III and DNA polymerase I? a. The DNA replication is bidirectional; one polymerase is used for each direction. b. Each polymerase is sp…

1. Why does KMnO4 need to be filtered? 2. Why is KMnO4 usually stored in a glass

1. Why does KMnO4 need to be filtered? 2. Why is KMnO4 usually stored in a glass-stoppered bottle instead of a rubber-stoppered bottle? 3. Why does the solution decolorize on stan…

1. Why does Oxygen bind more effectively to Iron (II) than Iron(III) in hemoglob

1. Why does Oxygen bind more effectively to Iron (II) than Iron(III) in hemoglobin? 2. Whic complex is commonly used to prepare pure Ni metal? 3. What would be the most effective …

1. Why does Si have a larger atomic radius than C? The valence electrons in C fe

1. Why does Si have a larger atomic radius than C? The valence electrons in C feel a stornger effective nuclear charge than those in Si. B) Si is lower down the group than C. The …

1. Why does dissolving soap in water produce an alkaline solution? 2. Why is a m

1. Why does dissolving soap in water produce an alkaline solution? 2. Why is a mixture of alcohol and water used, rather than simply water itself, to saponify the fat or oil to pr…

1. Why does the green dye have two peaks in its spectrum? A two-component mixtur

1. Why does the green dye have two peaks in its spectrum? A two-component mixture is made up of Components A and B. The absorption spectrum for the mixture is given in the box bel…

1. Why doesn\'t the presence of other metal ions from the dissolved brass sample

1. Why doesn't the presence of other metal ions from the dissolved brass sample interfere with the quantitative analysis of copper in this experiment? Select the number for the an…

1. Why is DNA more stable than RNA? What is the physiologic significance of this

1. Why is DNA more stable than RNA? What is the physiologic significance of this variability in stability? 2. What forces drive the formation of double helical DNA? What forces st…

1. Why is DNA more stable than RNA? What is the physiologic significance of this

1. Why is DNA more stable than RNA? What is the physiologic significance of this variability in stability? 2. What forces drive the formation of double helical DNA? What forces st…

1. Why is acceptable to use a mixture of the alpha and beta anomers of D-(+)-man

1. Why is acceptable to use a mixture of the alpha and beta anomers of D-(+)-mannose in this reaction? (i.e. why isn't it necessary to use either a pure alpha or the pure beta ano…

1. Why is accessing an item by index slower in a linked list than an array? 2. W

1. Why is accessing an item by index slower in a linked list than an array? 2. What is the Big-O running time of the following code fragment? Assume lst1 has N items, and lst2 is …

1. Why is it a disadvantage to use a large amount of sample on the hot stage? 2.

1. Why is it a disadvantage to use a large amount of sample on the hot stage? 2. What effect do impurities in an organic solid have on melting point? Questions 3 and 4 follow from…

1. Why is it a good idea to include human resources on the incident response man

1. Why is it a good idea to include human resources on the incident response management team? 2. How do an incident response plan and incident response team help reduce risks to t…

1. Why is it good for binary search trees to be balanced? 2. A binary search tre

1. Why is it good for binary search trees to be balanced? 2. A binary search tree has a right subtree but no left subtree. What node contains the least element in the tree? 3. Wha…

1. Why is it important that a pencil rather than a ball-point pen or marker be u

1. Why is it important that a pencil rather than a ball-point pen or marker be used to mark the TLC plate prior to development? 2. A TLC plate is developed in a solvent system con…

1. Why is it important that all the glassware or equipment used must be thorough

1. Why is it important that all the glassware or equipment used must be thoroughly with deionized water? 2. What does it mean to saturate a solution, and how will this affect an o…

1. Why is it important that all the glassware or equipment used must be thorough

1. Why is it important that all the glassware or equipment used must be thoroughly with deionized water? 2. What does it mean to saturate a solution, and how will this affect an o…