Description : The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. a) Calculate the average atomic mass of elements X and Z. b) How is the ... this example? d) Give another example of a set of elements which are classified according to this law.
Last Answer : a) The average atomic mass of X and Z = 7 39 2 46 2 23 b) The average atomic mass of X and Z is equal to the atomic mass of Y c) The law illustrated in this example is Dobereiner’s law of triads. d) Another example of Dobereiner’s law is Calcium, Strontium and Barium.
Description : In 1866, John Newlands, an English scientist, arranged the then known elements in the order of increasing atomic masses. He found that every eighth element had properties similar to that of the first. He called it ... of Pentamates (2) Law of musical notes (3) Law of Octaves (4) None of the above
Last Answer : (3) Law of Octaves Explanation: Newlands compared his discovery to the octaves found in music and thus, he called it the ‘Law of Octaves’. It is also known as ‘Newlands’ Law of Octaves’.
Description : Why the elements belonging to the same group do have similar chemical properties ?
Last Answer : Why the elements belonging to the same group do have similar chemical properties?
Description : Law of octaves says that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of elements
Last Answer : 7
Description : What is the smallest particle of an element that contains all the chemical properties of that element?
Last Answer : An atom is the smallest particle of an element that retains all its chemical properties.
Description : What are some physical and chemical properties of the element neon?
Last Answer : Feel Free to Answer
Description : Helium (He), neon (Ne) and argon (Ar) are all colorless, odorless gases with low chemical reactivity. Based on the periodic table, which other element would also have those same properties?
Last Answer : Helium
Description : Which of the following determines the chemical properties of an element?
Last Answer : Number of electrons
Description : Isotopes of an element have different (A) Mass number (B) Electronic configuration (C) Nuclear charge (D) Chemical properties
Last Answer : (A) Mass number
Description : What element has the same valence electron configuration as phosphorus?
Last Answer : The answer is nitrogen. Nitrogen is one example of an elementthat has the same valence electron configuration asphosphorus.Ê
Description : The element which is required by the plant in large quantity – (1) Calcium (2) Nitrogen (3) Phosphorus (4) Sulphur
Last Answer : (2) Nitrogen Explanation: All plants need nitrogen to make amino acids, proteins and DNA, but the nitrogen in the atmosphere is not in a form that they can use. Plants use nitrogen by absorbing either nitrate or ammonium through the roots.
Description : Which of the following is an essential element used in the synthesis of proteins and other compounds? (1) Phosphorus (2) Iron (3) Magnesium (4) Nitrogen
Last Answer : (4) Nitrogen Explanation: Although all of the elements above are used by plants and taken up via the soil, nitrogen is especially essential and used specifically for the for the synthesis of proteins and other compounds.
Description : The element used for vulcanizing rubber is - (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus
Last Answer : (1) Sulphur Explanation: The vulcanization of neoprene or polychloroprene rubber (CR rubber) is carried out using metal oxides (specifically MgO and ZnO, sometimes Pb3O4) rather than sulfur compounds which are presently used with many natural and synthetic rubbers.
Description : The element absorbed both in cation and anion form is – (1) Sulphur (2) Nitrogen (3) Calcium (4) Phosphorus
Last Answer : (2) Nitrogen Explanation: Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
Description : The element which is used for vulcanizing rubber – (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus
Last Answer : (1) Sulphur Explanation: Vulcanisation is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". By far the most common vulcanizing methods depend on sulfur.
Description : Which one of the following element is mobile in plants but immobile in soil ? (A) Sulphur (B) Zinc (C) Boron (D) Phosphorus
Last Answer : (D) Phosphorus
Description : The deficiency of this element leads to older leaves turning purple in colour on the underside. Identify the mineral? [a] Calcium [b] Phosphorus [c] Potassium [d] Iron [e] None of the above
Last Answer : [c] Potassium
Description : Which one of the following is not an essential mineral element for plants while the remaining three are? (a) Iron (b) Manganese (c) Cadmium (d) Phosphorus
Last Answer : (c) Cadmium
Description : What is the only nonmetal element that is a liquid room temperature? w) phosphorus x) bromine y) iodine z) arsenic
Last Answer : ANSWER: X -- BROMINE
Description : The element which is required by the plant in large quantity : (1) Calcium (2) Nitrogen (3) Phosphorus(4) Sulphur
Last Answer : Nitrogen
Description : The element absorbed both in cation and anion form is (1) Sulphur (2) Nitrogen (3) Calcium (4) Phosphorus
Description : The element which is used for vulcanizing rubber (1) Sulphur (2) Bromine (3) Silicon (4) Phosphorus
Last Answer : Sulphur
Description : (a) Define a balanced chemical equation. Why should an equation be balanced? (b) Write the balanced chemical equation for the following reaction: (i) Phosphorus burns in presence of chlorine to form phosphorus penta chloride. (ii) Burning of natural gas. (iii) The process of respiration. -Chemistry
Last Answer : Answer. (a) Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. According to law of conservation of mass, matter can neither be created nor be destroyed in a chemical ... C6H12O6 (s) + 6O2 (g) + 6H2O ---> 6CO2 (aq) + 12H2O (l) + energy
Last Answer : : Chemical signal of phosphorus pentachloride PCl5
Last Answer : : Chemical signal of phosphorus trichloride PCl3
Description : Which of the following statements reflect the nursing management of the patient with a white phosphorus chemical burn? a) Do not apply water to the burn. Water should not be applied to burns from ... from lye or white phosphorus because of the potential for an explosion or deepening of the burn.
Last Answer : a) Do not apply water to the burn. Water should not be applied to burns from lye or white phosphorus because of the potential for an explosion or deepening of the burn.
Description : Explain the effects of following chemical elements on iron. i) Copper ii) Phosphorus iii) Manganese
Last Answer : Effect on iron: i) Copper: it improves the resistance to atmospheric corrosion. It strengthens steel. It may be added to improve formability. It improves pains adhesion ii) ... Manganese:it increase tensile strength, abrasion resistance, hardenability and toughness . it decrease weldability.
Description : a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science
Last Answer : (a) The repetition of same properties after definite interval is called periodicity in properties. (b) It is because they have same valence electrons therefore, have similar properties. (c) ... to right in a period because atomic size goes on decreasing and effective nuclear charge increases.
Description : Which of the following pair of elements has similar properties ?
Last Answer : Which of the following pair of elements has similar properties? a. 13, 31 b. 11, 20 c. 12, 10 d. 21, 33
Description : How does silicon have similar properties as Al and P?
Last Answer : What is the answer ?
Description : What elements have similar properties with krypton?
Description : Magnesium and calcium are in the same group on the periodic table. Which sentence best explains why they have similar properties?
Last Answer : C. They both have two......
Description : Isoenzymes are (A) Chemically, immunologically and electrophoretically different forms of an enzyme (B) Different forms of an enzyme similar in all properties (C) Catalysing different reactions (D) Having the same quaternary structures like the enzymes
Last Answer : Answer : A
Description : The cause of periodicity of properties (a) Increasing atomic radius (b) Increasing atomic weights (c) Number of electrons in the valency orbit (d) The recurrence of similar outer electronic configuration
Last Answer : Ans:(d)
Description : An arrangement of elements with similar properties placed together is called?
Last Answer : Periodic Table
Description : Why do Zr and Hf show similar properties ?
Last Answer : Ans It is due to similar ionic size which due to lanthanide contraction .
Description : According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the
Last Answer : eighth element starting from oxygen
Description : X and Y are the two elements having similar properties which obey Newland’s law of octaves. How many elements are there in-between X and Y?
Last Answer : There are 6 elements between X and Y
Description : the smallest unit of an element that has all of the properties of the element is a/an -General Knowledge
Last Answer : The smallest unit of an element that has all of the properties of the element is an atom.
Description : what are three physical properties of an element that you can observe?
Last Answer : density, color, hardness
Description : Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is used as reducing agent Properties of element Y: (i) It is an o
Last Answer : Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is ... in its maximum oxidation state is neutral in aq. Medium
Last Answer : Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is used as ... oxidation number of Y in this compound is `+4`
Last Answer : Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is used as reducing agent ... 3` and `+5` D. `-2` and `+4`
Description : What is a type of element who's physical properties are generally apposite of that of metals?
Last Answer : Need answer
Description : What is an element that has properties such as shine conductivity and flexibility is an?
Description : What are physical properties of the element sulfur?
Description : The smallest particle of an element or a compound; which shows all the properties of that substance is known as?
Last Answer : molecule
Description : The parasitic element of an antenna system will A. decrease its directivity B. increase its directivity C. give the antenna unidirectional properties D. both B and C
Last Answer : D. both B and C