Description : A substance that accepts an electron pair is classified as a: w) bronsted-lowry acid x) bronsted-lowry base y) lewis acid z) lewis base
Last Answer : ANSWER: Y -- LEWIS ACID
Description : Any species that acts as an electron-pair acceptor a: w) Lewis base x) Bronsted base y) Lewis acid z) Bronsted acid
Description : Which is defined as a species that accepts a proton? (a) Lewis acid (b) Lewis base (c) Bronsted-Lowry acid (d) Bronsted-Lowry base
Last Answer : Bronsted-Lowry base
Description : A nucleophile acts as a __________ when it reacts with an electrophile. (a) Bronsted-Lowry acid (b) Arrhenius base (c) Lewis acid (d) Lewis base
Last Answer : Lewis base
Description : An electrophile acts as a __________ when it reacts with a nucleophile. (a) Bronsted-Lowry base (b) Arrhenius base (c) Lewis acid (d) Lewis base
Last Answer : Lewis acid
Description : Ammonia can be considered a Lewis base because it can donate: w) electrons x) protons y) hydronium ions z) hydroxide ions
Last Answer : ANSWER: A -- ELECTRONS
Description : Identify a species which is not a Bronsted acid but a Lewis acid:
Last Answer : Identify a species which is not a Bronsted acid but a Lewis acid: A. HCl B. `NH_(3)` C. `BF_(3)` D. `H_(3)^(+)O`
Description : An electron is classified as a: w) boson x) nucleon y) fermion z) meson
Last Answer : ANSWER: Y -- FERMION
Description : When radiation breaks an electron pair bond in a molecule and each fragment of the molecule gets one of the bond electrons, the molecular fragments that are formed are called: w) ions x) free radicals y) stable molecules z) gases
Last Answer : ANSWER: X -- FREE RADICALS
Description : This black engineer was granted a patent in 1872 for the first automatic oil lubricator. The lubricating cup regulated the flow of oil onto moving parts of machines, revolutionizing the machine industry. ... well-known inventor: w) Elijah McCoy x) Lewis Latimer y) Leonard McFall z) Branville Woods
Last Answer : ANSWER: W -- ELIJAH McCOY
Description : If a material has the capacity to behave either as an acid or a base it is said to be: w) amorphous x) amphoteric y) anhydrous z) aklaline
Last Answer : ANSWER: X -- AMPHOTERIC
Description : Buffer solutions show which one of the following traits: w) absorb acid and base with only small changes in pH x) indefinite stability y) high elasticity z) abnormal density
Last Answer : ANSWER: W -- ABSORB ACID AND BASE WITH ONLY SMALL CHANGES IN pH
Description : In protolytic reactions in which the reactants are much stronger as an acid and a base than the products, the proton transfer reaction: w) does not occur x) approaches completeness y) produces a much stronger acid and a much weaker base z) produces a much weaker acid and a much stronger base
Last Answer : ANSWER: X -- APPROACHES COMPLETENESS
Description : Which of the following chemical reactions does not lead to formation of a salt? w) Reaction of salts with acids. x) The reaction of base anhydrides with acid anhydrides. y) Action of water on oxides of nonmetals. z) Reaction of acid with base.
Last Answer : ANSWER: Y -- ACTION OF WATER ON OXIDES OF NONMETALS. (If water reacts with oxides of nonmetals, an acid is formed.)
Description : Which compound is responsible for the rotten egg smell? w) sulfuric acid x) putrescine y) hydrogen sulfide z) sulfur dioxide
Last Answer : ANSWER: Y -- HYDROGEN SULFIDE (NOTE: putrescine is a real compounz)
Description : An alcohol is related to an ester as a hydroxide compound is related to: w) an acid x) a ketone y) an ether z) a salt
Last Answer : ANSWER: Z -- A SALT
Description : Which of the following elements would form an acid oxide with the formula XO2 and an acidic compound with hydrogen with the formula XH2? w) Sodium x) Magnesium y) Aluminum z) Sulfur
Last Answer : ANSWER: Z -- SULFUR
Description : Certain substances are classified as water pollutants, others as air pollutants and still others as land pollutants. Which of the following pollutes all three parts of our environment? w) fluorocarbons x) smog y) acid rain z) ozone
Last Answer : ANSWER: Y -- ACID RAIN
Description : Mineral acids are also classified as: w) carboxyl acids x) inorganic acids y) non-electrolytic acids z) oxidation acids
Last Answer : ANSWER: X -- INORGANIC ACIDS
Description : Which of the following substances is classified as amorphous? w) glass x) Zinc y) diamond z) sodium chloride
Last Answer : ANSWER: W -- GLASS
Description : Which one of the following is classified as a covalent network solid crystal? w) CaO x) SiO2 y) CO2 z) Pb
Last Answer : ANSWER: B -- SiO2
Description : Gels and Foams are classified as: w) solutions x) emulsions y) colloids z) suspensions
Last Answer : ANSWER: C -- COLLOIDS
Description : Sucrose, ordinary table sugar, may be classified as a: w) Monosaccharide x) Disaccharide y) Polysaccharide z) Oligosaccharide
Last Answer : ANSWER: X -- DISACCHARIDE
Description : Which of the following is stronger Bronsted base?
Last Answer : Which of the following is stronger Bronsted base? A. B. C. D.
Description : Which of the following is the weakest Bronsted base?
Last Answer : Which of the following is the weakest Bronsted base? A. B. C. D.
Description : Which of the following is the strongest Bronsted base?
Last Answer : Which of the following is the strongest Bronsted base? A. B. C. D.
Description : Is h20 a bronsted base?
Last Answer : Feel Free to Answer
Description : Which of the following species has the smallest equilibrium separation for its ion-pair? w) KF x) LiF y) BaBr z) NaCl
Last Answer : ANSWER: B -- LiF
Description : What is the purpose of the salt bridge in an electrochemical cell? w) It allows ion migration. x) It allows electron flow. y) It prevents ion migration. z) It prevents electron flow.
Last Answer : ANSWER: W -- IT ALLOWS ION MIGRATION
Description : The orbital angular momemtum quantum number indicates which one of the following? w) the average distance of the electrons from the nucleus x) the direction of spin of the electron y) the shape of the orbital z) the position about the three axes in space of the orbital
Last Answer : ANSWER: Y -- THE SHAPE OF THE ORBITAL
Description : Which of the following terms refers to the energy released when an electron is added to a neutral atom? w) electrovalence x) electron affinity y) electroconductance z) none of these
Last Answer : ANSWER: X -- ELECTRON AFFINITY
Description : Which of the following indicates the shape of the orbital in which the electron moves? w) principal quantum number x) spin quantum number y) angular momentum quantum number z) none of these
Last Answer : ANSWER: Y -- ANGULAR MOMENTUM QUANTUM NUMBER
Description : The elements that have an outer electron configuration ns2 (read: n - s - 2) are called: w) halogens x) transition metals y) alkaline earths z) noble gases
Last Answer : ANSWER: Y -- ALKALINE EARTHS
Description : The azimuthal quantum number determines the: w) spin of an electron x) shape of an orbital y) size of an orbital z) energy of an orbital
Last Answer : ANSWER: X -- SHAPE OF AN ORBITAL
Description : The 1936 Nobel Prize in chemistry was awarded to Peter J.W. Debye for his studies of: w) kinetic energy of colliding particles x) electron configuration y) dipole moments z) conformations of cyclohexane
Last Answer : ANSWER: Y -- DIPOLE MOMENTS
Description : In the filling of electron orbitals for the elemen sulfur, which has 16 electrons, the number of electrons in the 3p orbitals is: w) 3 x) 4 y) 6 z) 0
Last Answer : ANSWER: X -- 4
Description : Alpha rays are different from beta rays in one of the following ways. Are they different since: w) alpha rays are deflected in a magnetic field and beta rays are not x) alpha rays are ... negative charge z) alpha rays are produced within the nucleus and beta rays are produced outside the nucleus
Last Answer : ANSWER: Y -- ALPHA RAYS HAVE A POSITIVE CHARGE AND BETA RAYS HAVE A NEGATIVE CHARGE
Description : Acetamide is a much weaker base than ammonia. This is because (a) the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation. (b) ) ... NH2 group. (d) an H atom from the nitrogen is less easily lost from CH3CONH2 than from NH3.
Last Answer : the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation
Description : Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z? A) Has high melting point B) Has low melting point C) Conducts electricity in molten state D) Occurs as solid
Last Answer : B) Has low melting point
Description : In alcohol fermentation (a) triose phosphate is the electron donor while acetaldehyde is the electron acceptor (b) triose phosphate is the electron donor while pyruvic acid is the electron acceptor (c) there is no electron donor (d) oxygen is the electron acceptor
Last Answer : (a) triose phosphate is the electron donor while acetaldehyde is the electron acceptor
Description : What purpose does FeCl3 serve in the electrophilic aromatic substitution reaction between chlorine and benzene? (a) It serves as a radical initiator to produce the chlorine radical needed to propagate the ... by reacting with the Cl2 and thereby activates it toward attack by benzene's π electrons.
Last Answer : It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.
Description : _______ Lewis Acid - Base Complexation Chemistry includes all the common mineral acids. (a) Type – 1 (b) Type – 2 (c) Type – 3 (d) Type – 4
Last Answer : (c) Type – 3
Description : The nuclei of heavy atoms generally contain: w) more electrons than neutrons x) more protons than electrons y) more neutrons than electrons z) more orbitals than electrons
Last Answer : ANSWER: Y -- MORE NEUTRONS THAN ELECTRONS
Description : Members of which of the following classes of compounds generally produce acidic solutions when dissolved in water? w) metal oxides x) nonmetal oxides y) alcohols z) aldehydes
Last Answer : ANSWER: X -- NONMETAL OXIDES
Description : As one goes across a period in the periodic table, the ionization energy generally increases for one of the following reasons. Is it because of the increasing w) atomic radius x) melting point y) nuclear charge z) density
Last Answer : ANSWER: Y -- NUCLEAR CHARGE
Description : A standardized base solution should be protected from which of the following gases? w) hydrogen x) carbon dioxide y) nitrogen z) argon
Last Answer : ANSWER: X -- CARBON DIOXIDE
Description : Which of the following is NOT a base in DNA? w) uracil x) guanine y) adenine z) cytosine
Last Answer : ANSWER: W -- URACIL
Description : Which of the following compounds is the strongest base? w) NH3 x) PH3 y) H2O z) H2S
Last Answer : ANSWER: W -- NH3
Description : The compound which would have the greatest molar effect on the colligative properties of a dilute solution would be: w) CaCl2 x) NaCl y) C6H12O6 z) Benzene
Last Answer : ANSWER: W -- CaCl2
Description : Which of the following organic compounds is known as a saturated chain hydrocarbon ? w) an aromatic compound x) an alkene y) an alkyne z) an alkane
Last Answer : ANSWER: Z -- AN ALKANE