Description : What statement about Arrhenius acids is FALSETheir aqueous solutions are electrolytesTheir water solutions are called aqueous acids They increase the concentration of hydroxide ions in aqueous solutionThey are molecular compounds with hydrogen ions?
Last Answer : The answer is: They increase the concentration of hydroxide ions in aqueous solution.
Description : The complete combustion of one mole of hydrogen produces: w) 1/2 mole H2O x) 1/2 mole H2O + 1/2 mole O3 y) 1 mole water z) 1 mole hydroxide ions
Last Answer : ANSWER: Y -- 1 MOLE WATER
Description : An Arrhenius acid is a substance that: w) donates protons x) accepts protons y) donates hydrogen ions to water z) donates hydroxide ions to water
Last Answer : ANSWER: Y -- DONATES HYDROGEN IONS TO WATER
Description : Which among the following is false about acids? (1) They give H+ ions in aqueous solution (2) Most acids contain hydrogen (3) They turn blue litmus red (4) They are bad conductor of electricity in aqueous solution
Last Answer : (4) They are bad conductor of electricity in aqueous solution Explanation: Acids are good conductors of electric current in aqueous solution. When acids come in contact with water, they liberate OH ions, resulting in conduction of electricity.
Description : Which of the following is NOT a general property of hydroxide bases in aqueous solution? w) High solubility x) Bitter taste y) Ability to neutralize aqueous acid solutions z) Ability to change phenolphthalein from colorless to red
Last Answer : ANSWER: W -- HIGH SOLUBILITY (The hydroxides of the alkali metals are soluble in water but all the other metal hydroxides are only moderately or sparingly soluble.)
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 : Do acids lose or gain hydrogen ions?
Last Answer : Acids lose hydrogen ions.
Description : There are two properties of the cell necessary to maintain nonequilibrium cellular composition; the first is selectivity and the second is energy conversion. Which of the following statement(s ... transported via secondary active transport include hydrogen ions, calcium, amino acids and glucose
Last Answer : Answer: c, d The selectivity of the plasma membrane, although impressive, cannot account for the nonequilibrium composition of living cells. A cell can be maintained in a nonequilibrium state only by ... to drive the transport of a second species such as protons, calcium, amino acids, or glucose
Description : Respiratory acidosis is that in which the blood pH is low due to increased retention of carbon dioxide caused by the lowering of the respiratory frequency or by pulmonary diseases that impair ... caused by metabolic disturbances that increase the concentration of bases (alkalis) in the blood.
Last Answer : Where are the chemoreceptors that detect the acidity of the blood and trigger the respiratory compensation located?
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 : What is the word that describes a substance that reacts with both strong acids and strong bases?
Last Answer : ANSWER: AMPHOTERIC
Description : _______ is the process in which acids and bases react to form salts and water. (1) Neutralization (2) Electrolysis (3) Distillation (4) Hydrolysis
Last Answer : (1) Neutralization Explanation: Neutralization is a process when acids and bases react to form salt and water.
Description : How is the acidic , basic character of acids and bases varies with respect to neutral water . Show these variations on the PH scale.
Last Answer : Ans: The PH of neutral water is 7 ,As the PH of solution deceases from 7 the acid characteristic of the solution increase so the acids having values 1 and 2 are strong acids and when the ... 7 the basic characteristic of the solution increase so the acids having values 11and 12 are strong bases.
Description : Amines are generally classified as (a) Weak acids (b) Strong acids (c) Weak bases (d) Strong bases
Last Answer : Weak bases
Description : Ethers are (a) Lewis acids (b) Neutral (c) Lewis bases (d) Can not be predicted
Last Answer : Lewis bases
Description : Amphoteric substances: w) act as either bases or acids x) precipatate from aqueous solutions y) salt out of basic solutions z) form emulsions in oils
Last Answer : ANSWER: W -- ACT AS EITHER BASES OR ACIDS
Description : Acids react with bases to form which of the following? Do they form: w) salt and acidic anhydride x) water and basic anhydride y) basic anhydride and salt z) salt and water
Last Answer : ANSWER: D -- SALT AND WATER
Description : Which of the following ions is most effective in the coagulation of ferric hydroxide solution ?
Last Answer : Which of the following ions is most effective in the coagulation of ferric hydroxide solution ? A. `Cl^(-)` B. `Br^( ... `NO_(2)^(-)` D. `SO_(4)^(2-)`
Description : 1 mole of `OH^(-)` ions is obtained from 85 g of hydroxide of a metal. What is the equivalent weight of the metal ?
Last Answer : 1 mole of `OH^(-)` ions is obtained from 85 g of hydroxide of a metal. What is the equivalent weight of the metal ?
Description : Is an acid a substance that forms hydroxide ions in a water solution?
Last Answer : Acids forms the ion H+.
Description : It is caused by hydroxide ions in the material ∙ A. visible light absorption ∙ B. infrared absorption ∙ C. ultraviolet absorption ∙ D. ion resonance absorption
Last Answer : D. ion resonance absorption
Description : It is caused by hydroxide ions in the material
Last Answer : ion resonance absorption
Description : Chemically, fats are esters of long carbon-chain acids and which of the following: w) ethanol x) glycerol y) ethylene glycol z) sodium hydroxide
Last Answer : ANSWER: X -- GLYCEROL
Description : The pH value of 12 may be of an aqueous solution of 1. Sodium hydroxide 2. Lithium hydroxide 3. Sodium chloride 4. Hydrogen chloride The correct statements are: (a) 1 and 2 (b) 2 and 4 (c) 3 and 4 (d) 1 and 4
Last Answer : Ans:(a)
Description : Write two important uses of each of the following: (i)Sodium carbonate (II)Sodium Hydroxide (iii)Sodium hydrogen carbonate
Last Answer : Ans.(I)Sodium carbonate :for softening of hard water ,laboratory reagent. (II)Sodium hydroxide: in the manufacture of soap, in the purification of bauxite. (iii) Sodium hydrogen carbonate: as a mild antiseptic, as an antacid.
Description : Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric ... Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate
Last Answer : 1. Copper oxide - CuO 2. Iron (III) chloride - FeCl3 3. Sodium hydroxide - NaOH 4. Iron (II) sulphide - FeS 5. Lead (II) oxide - PbO 6. Hydrogen nitrate (nitric acid) - HNO3 7. ... ) - H2SO4 8. Calcium hydroxide - Ca(OH)2 9. Magnesium carbonate - MgCO3 10.Ammonium carbonate - (NH4)2CO3
Description : Read the statements given below and identify the incorrect statement. a) The human genome contains 3164.7 million nucleotide bases. b) The average gene consists of 30,000 bp c) The total number of genes is ... . d) Chromosome Y has 231 genes e) Less than 2% of the genome codes for proteins.
Last Answer : d) Chromosome Y has 231 genes
Description : Buffer solutions have constant acidity and alkalinity because: (1) they have fixed value of pH (2) these give unionised acid or base on reaction with added acid or alkali (3) acids and alkalies in these solutions are shielded from attack by other ions (4) they have large excess of H+ or OH– ions
Last Answer : these give unionised acid or base on reaction with added acid or alkali
Description : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.
Last Answer : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of ... R is false D. A is false but R is true
Description : What four properties that acids and bases have in common?
Last Answer : Feel Free to Answer
Description : Why do acids and bases make good electrical conductors when dissolved in water?
Last Answer : Acids, bases, and salts are ionically bonded and easily separate into oppositely charged free ions in water solution. Both the positive and negative ions then act as charge carriers, moving in response to an applied electric field thus facilitating electrical conductivity.
Description : Most liquids that conduct electricity are solutions of acids, bases and ______. Salts Who is known as the father of modern chemistry?
Last Answer : Antoine Lavoisier
Description : Degeneracy of the genetic code denotes the existence of (A) Base triplets that do not code for any amino acids (B) Codons consisting of only two bases (C) Codons that include one or more of the unusual bases (D) Multiple codons for a single amino acid
Last Answer : Answer : B
Description : Nucleotides required for the synthesis of nucleic acids can be obtained from (A) Dietary nucleic acids and nucleotides (B) De novo synthesis (C) Salvage of pre-existing bases and nucleosides (D) De novo synthesis and salvage
Last Answer : Answer : D
Description : Amino acids provide the nitrogen for the synthesis of (A) The bases of the phospholipids (B) Uric acid (C) Glycolipids (D) Chondroitin sulphates
Last Answer : Answer : A
Description : Which of the following statement(s) is/are true concerning translation of the mRNA message to protein synthesis? a. An adaptor molecule, tRNA, recognizes specific nucleic acid bases and unites them ... and the free amino acid occurs in the free cytoplasm d. Complete protein synthesis takes hours
Last Answer : Answer: a, b The synthesis of protein involves conversion from a four-letter nucleotide language to one of 20 chemically distinct amino acids. This process is referred to as ... translation and be moving down the mRNA molecules simultaneously, thus increasing the rate of protein synthesis
Description : If there are 999 bases in an RNA that code for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered? (a) 11 (b) 33 (c) 333 (d) 1
Last Answer : (d) 1
Last Answer : b) 33
Description : Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it? (a) Guanine, Adenine - Purines (b) Adenine, Thymine - Purines (c) Thymine, Uracil - Pyrimidines (d) Uracil, Cytosine - Pyrimidines
Last Answer : (b) Adenine, Thymine - Purines
Description : During neutralization reaction acids react with ........to form ........and water. (a) Metals ,Gas (b) Bases, Salt (c) Non-Metal , Salt (d)Acids ,Salts
Last Answer : (b) Bases, Salt
Description : Which is wrong about nucleic acids? (a) DNA is single stranded in some viruses. (b) RNA is double stranded occasionally. (c) Length of one helix is 45 Å in B-DNA. (d) One turn of Z-DNA has 12 bases
Last Answer : (c) Length of one helix is 45 Å in B-DNA
Description : What is needed in order for reactions to occur at body temperatures? a. buffers b. acids c. bases d. enzymes
Last Answer : d. enzymes
Description : Ch 2 – Acids Bases and Salt
Last Answer : Ch 2 – Acids Bases and Salt notes
Description : If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ? (1) 11 (2) 33 (3) 333 (4) 1
Last Answer : (2) 33
Description : The bacteria which cause dental cavities in humans break down sugars, releasing what chemical, that causes tooth destruction? a) acids b) bases c) enzymes d) monosaccharides
Last Answer : ANSWER: A -- acids
Description : All the following statements about renal tubular acidosis are correct except (A) Renal tubules may be unable to reabsorb bicarbonate (B) Renal tubules may be unable to secrete hydrogen ions (C) Plasma chloride is elevated (D) Anion gap is decreased
Description : pH is defined as the negative logarithm of the hydrogen ion concentration. Comparing a pH 5 and a pH 8 solution, which of the following is true? w) There are 1,000 times more hydrogen ions in ... . z) Cannot tell the difference between these two solutions by pH, since the numbers are so close.
Last Answer : ANSWER: X -- THERE ARE 1,000 TIMES MORE HYDROGEN IONS IN THE PH 5 SOLUTION
Description : Which of the following molecules or ions is NOT formed when K metal reacts with liquid CH3OH? Is it: w) potassium ion x) hydrogen ion y) methoxy ion z) hydrogen molecule
Last Answer : ANSWER: X -- HYDROGEN ION
Description : All the following statements about recognition of a codon on mRNA by an anticodon on tRNA are correct except (A) The recognition of the third base of the codon is not very precise (B) ... degeneracy of the genetic code (D) Wobble results in incorporation of incorrect amino acids in the protein