Description : Name the person who developed a table of elements which revealed regularities in elemental properties in 1869? w) Theodore Richards x) Antoine Lavoisier y) Dmitri Mendeleev z) Svante Arrhenius
Last Answer : ANSWER: Y -- DMITRI MENDELEEV
Description : Who invented the modern Periodic table? (1) Faraday (2) Mendeleev (3) Newton (4) Bohr
Last Answer : (2) Mendeleev Explanation: Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.
Description : Modern periodic law had been given by (1) Moseley (2) Mendeleev (3) Lother-Mayer (4) Lavoisier
Last Answer : (1) Moseley Explanation: In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
Description : (a) Why do we classify elements? (b) What were the two criteria used by Mendeleev in creating his Periodic Table? ... Justify your answer. -Chemistry 9th
Last Answer : (a) It is done so as to study the properties of elements conveniently. (b) Increasing order of atomic mass and similarities in chemical properties (especially nature and formulae of oxide and hydride formed). ... at that time. (e) They will be kept at same slot as they have same chemical properties.
Description : What is the number of elements in a periodic table made by Lavoisier ?
Last Answer : Elements 33 in the periodic table created by Lavoisier .
Description : ........................ studied the kinetics of enzyme catalysis. a. Arrhenius b. Rutherford c. Micheal Faraday d. Michaelis & Menten
Last Answer : d. Michaelis & Menten
Description : My theory of electrolytic dissociation earned me t 1903 Nobel Prize in chemistry. My name is: w) Niels Bohr x) Svante Arrhenius y) Michael Faraday z) John Cavendish
Last Answer : ANSWER: X -- SVANTE ARRHENIUS
Description : The names of the scientists, Newlands, Mendeleev and Meyer are associated with the development of (a) Atomic structure (b) Metallurgy (c) Periodic table of elements (d) Discovery of elements
Last Answer : Ans:(c)
Description : Mendeleev arranged the elements in his periodic table on the basis of
Last Answer : atomic mass.
Description : How many elements did Mendeleev introduce the modern periodic table ?
Last Answer : Mendeleev introduced the modern periodic table with 67 elements.
Description : What did Moseley use to reorder the elements of Mendeleev periodic table?
Last Answer : Henry Moseley discovered a relation between X-ray spectra and the atomic number of chemical elements.
Description : How Mendeleev organized his periodic table?
Last Answer : By the increasing Atomic Mass.
Description : How was Mendeleev and periodic table different from those of other chemists of the time?
Last Answer : Feel Free to Answer
Description : How did Mendeleev arrange the known element in his periodic table?
Last Answer : He arranged the elements in the increasing order of their atomicmasses and repeating periodic properties.
Description : How did Mendeleev arrange the known elements in this periodic table?
Description : Why are isotopes not considered in Mendeleev’s periodic table?Name the elements which are predicted by Mendeleev as eka –silicon and eka –aluminum
Last Answer : Ans.Because Mendeleev gave priority to similarities in properties. Germanium and gallium
Description : What are the important features of Mendeleev periodic table?
Last Answer : Ans: based on(i) increasing atomic mass (ii) similarities in properties of elements.(iii) 63 elements divided in 7 horizontal row called periods and 8 vertical groups
Description : In his periodic table, Mendeleev could not assign a correct position to
Last Answer : Hydrogen
Description : State Mendeleev Periodic Law.
Last Answer : Ans: The chemical and physical properties of the elements are periodic functions of their atomic masses.
Description : Dmitri Mendeleev created the what?
Last Answer : Periodic table
Description : What alloy is created when you melt and mix all metals on the periodic table in equal portions?
Last Answer : You can’t mix them all, their melting points are vastly different.
Description : What has Michael Faraday created when his wife's brother flipped the switch for the elecricity?
Last Answer : Need answer
Description : “Plum Pudding Model” for an atom was proposed by (a) Antoine Lavoisier (b) Robert Boyle (c) Ernest Rutherford (d) J. J. Thomson
Last Answer : Ans:(d)
Description : Lavoisier did not share any basic substances ?
Last Answer : Lavoisier did not share copper.
Description : Who is regarded as father of modern chemistry? (1) Ruterford (2) Einstein (3) Lavoisier (4) C.V. Raman
Last Answer : (3) Lavoisier Explanation: Antoine Lavoisier is considered the father of modern chemistry. He was a French nobleman who recognized and named oxygen and isolated the major components of air.
Description : Who among the following discovered electron? (1) J.J Thomson (2) Max Born (3) Antoine Lavoisier (4) Mendeleef
Last Answer : (1) J.J Thomson Explanation: Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
Description : The father of modern chemistry is – (1) Priestley (2) Lavoisier (3) Dalton (4) Mendeleeff
Last Answer : (2) Lavoisier Explanation: Antoine Lavoisier was a French nobleman and chemist central to the 18thcentury chemical revolution and a large influence on both the history of chemistry and the history of biology.
Description : Father of Biochemistry is — a. Antoine lavoisier b. Carl Neuberg c. J.E. Summer d. Berzelius
Last Answer : a. Antoine lavoisier
Description : "If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them". This is __________ law. (A) Hess's (B) Kirchoff's (C) Lavoisier and Laplace (D) None of these
Last Answer : (A) Hess's
Description : The law of multiple proportions was proposed by [IIT 1992] (A) Lavoisier (B) Dalton (C) Proust (D) Gay-Lussac
Last Answer : (B) Dalton
Description : Which of the following scientists first stated the law of conservation of mass? Was it: w) Lavoisier x) Dalton y) Proust z) Boyle
Last Answer : ANSWER: W -- LAVOISIER
Description : Which are the only two elements on the periodic table that are liquid at room temperature? A. Mercury and Bromine (Answer) B. Carbon and helium C. Nitrogen and Hydrogen D. Oxygen and Neon
Last Answer : A. Mercury and Bromine (Answer)
Description : What is the first element in the periodic table? A. Hydrogen (Answer) B. Helium C. Nitrogen D. Carbon
Last Answer : A. Hydrogen (Answer)
Description : How many rows and columns are in the modern Periodic Table? A. 18 columns and 7 rows (Answer) B. 12 columns and 9 rows C. 7 columns and 18 rows D. 25 columns and 15 rows
Last Answer : A. 18 columns and 7 rows (Answer)
Description : What are rows in Periodic table called? A. Period (Answer) B. Group C. Verticals D. Perpendiculars
Last Answer : A. Period (Answer)
Description : What are Columns in Periodic table called? A. Period B. Group (Answer) C. Verticals D. Perpendiculars
Last Answer : B. Group (Answer)
Description : Battery was invented by-----? A. Nicolas Léonard Sadi Carnot B. Alessandro Volta (Answer) C. Michael Faraday D. Friedrich Bessel
Last Answer : B. Alessandro Volta (Answer)
Description : Electron was discovered by? A. Michael Faraday B. James Maxwell C. Yuri Gagarin D. J.J Thomson (Answer)
Last Answer : D. J.J Thomson (Answer)
Description : Diesel engine was discovered by------? A. Paul Muller B. Faraday C. Waldeyer D. Rudolf Diesel (Answer)
Last Answer : D. Rudolf Diesel (Answer)
Description : Founder of modern astronomy was ---------? A. Archimedes B. William Gilbert C. Nicolas Copernicus (Answer) D. Michael Faraday E. None of these
Last Answer : C. Nicolas Copernicus (Answer)
Description : A gaseous organic compound that is best known for its use in preservative solutions has the chemical formula HCHO (read: H - C - H CHEM-92; Short Answer: Give me the name and atomic number ... element is a clear, odorless gas. This element is one of the essential ingredients in the burning process.
Last Answer : ANSWER: OXYGEN ATOMIC NUMBER = 8
Description : State Arrhenius theory of dissociation.
Last Answer : “The molecules of an electrolyte in aqueous solution break into ions”
Description : What is true of arrhenius solution?
Description : What characterize an Arrhenius base?
Last Answer : It Produces a hydroxide ion
Description : What are examples of Arrhenius bases?
Last Answer : Examples: sodium hydroxide - NaOH, lithium hydroxide - LiOH, potassium hydroxide - KOH.
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 : Arrhenius equation K = Ae-E a / R T In some reactions, Rate of reaction is directly proportional to. Concentration of catalyst Catalyst used in Bio-Chemical reactions is called. Enzymes Reactions catalyzed by light are called as. Photo catalyzed or Photosensitised reactions
Last Answer : Define order of reaction
Description : The units of frequency factor in Arrhenius equation (A) Are the same as those of the rate constant (B) Depend on the order of the reaction (C) Depend on temperature, pressure etc. of the reaction (D) Are cycles per unit time
Last Answer : (A) Are the same as those of the rate constant
Description : From Arrhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is (A) k cal (B) k cal/°K (C) °K (D) k cal. °K
Last Answer : (C) °K