Description : Which is not a type of elements? (1) Metals (2) Non Metals (3) Metalloids (4) Gases
Last Answer : (3) Metalloids Explanation: Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
Description : Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electron shell. B ... (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.
Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
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 : Catalytic converters are fitted in to automobiles for reducing emission of poisonous gases, having expensive metals namely.
Last Answer : Catalytic converters are fitted in to automobiles for reducing emission of poisonous gases, having ... Lead and Cadmium D. copper and cadmium
Description : Give reasons : a. Alkali metals have low ionization energies. b. Inert gases have exceptionally high ionization energies.
Last Answer : Give reasons : a. Alkali metals have low ionization energies. b. Inert gases have ... d. Noble gases possess relatively large atomic size.
Description : What is the most active group of nonmetals noble gases alkaline earth halogens alkali metals?
Last Answer : The most active metals are alkali metals.The most active nonmetals are halogens.
Description : Who has the most active group of nonmetals noble gases alkaline earth halogens alkali metals?
Last Answer : Kevin
Description : Exposure to SO2 containing chimney gases results in the (A) Reduction in strength of leather & cloth (B) Acceleration of corrosion rates of metals (C) Increased drying & hardening time of paints (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Which of the following have the highest thermal conductivities? a. liquids b. gases c. metals d. solids other than metals
Last Answer : metals
Description : What are transition elements? (1) Elements whose two outermost shells are incomplete (2) Elements which possess properties of both, metals and non-metals (3) They have eight electrons in the outermost shell (4) Elements whose three outermost shells are incomplete
Last Answer : (1) Elements whose two outermost shells are incomplete
Description : what do you understand by “Non stoichiometric hydrides”? Do you think this type of hydrides to be formed by alkali metals? Justify your answer.
Last Answer : Ans: Hydrides which are deficient in hydrogen and in which the ratio of hydrogen to metal is fractional are called non-stoichiometric hydrides. This type of hydrides are formed by d-and ... they form only stoichiometric hydrides. In other words alkali metals do not form non-stoichiometric hydrides.
Description : Define Metals , Non Metals & Metalloids.
Last Answer : Metals : 1. They are electropositive elements. 2. Their oxides are basic. 3. They tend to lose electrons & form positive ions. 4. They are lustrous , malleable & ductile except Hg which is the ... acidic ) in nature. 3. They are concentrated between the metals & the nonmetals in the periodic table.
Description : In known elements, the maximum number is of [CPMT 1985] (A) Metals (B) Non-metals (C) Metalloids (D) None of these
Last Answer : (A) Metals
Description : The lanthanide series elements are also known as: w) rare earth elements x) non-metals y) fifth period elements z) sixth period elements
Last Answer : ANSWER: W -- RARE EARTH ELEMENTS
Description : What force between molecules tends to cause most common gases to behave as non-ideal gases? w) Van der Waals' force x) ionic bonding force y) gravitational force z) covalent bonding force
Last Answer : ANSWER: W -- VAN DER WAALS' FORCE
Description : Cinnabar, pyrite and galena are minerals which consist of one or more metals combined with the same element. Which one of the following is the element that is common to all three of these minerals? Is it: w) iron x) copper y) sulfur z) sodium
Last Answer : ANSWER: C-- SULFUR
Description : Two ideal gases under same pressure and temperature are allowed to mix in an isolated system. What will be the sign of entropy change?
Last Answer : Ans. Entropy change (∆S) is positive. It is because disorder or degree of freedom increases on mixing.
Description : Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats (Cp /Cv ) of the mixture will be (1) 1.67 (2) 0.83 (3) 1.50 (4) 3.3
Last Answer : (1) 1.67
Description : During osmosis w) Pure solvent diffuses through a membrane but solutes do not. x) Pure solutes diffuse through a membrane but solvent does not. y) Pure solvent and a solution both diffuse at the same time through a membrane. z) Gases diffuse through a membrane into a solution and build up pressure.
Last Answer : ANSWER: W -- PURE SOLVENT DIFFUSES THROUGH A MEMBRANE BUT SOLUTES DO NOT.
Description : Who first postulated the statement "equal volumes of gases, at the same temperature and pressure, contain equal numbers of molecules."
Last Answer : ANSWER: (AMADEO) AVOGADRO
Description : "Under the same conditions of temperature and pressure, the volumes of reacting gases and of their gaseous products are expressed in ratios of small whole numbers." This law is attributed to: w) Dalton x) Gay-Lussac y) Ramsay z) Avogadro
Last Answer : ANSWER: X -- GAY-LUSSAC
Description : Which one of the following statements is TRUE regarding the molar heat capacity for the noble gases? w) heat capacity decreases from Helium to Xenon x) heat capacity increases from helium to argon y) heat ... Helium to Argon, then decreases to Xenon z) heat capacity is the same for all noble gases
Last Answer : ANSWER: Z -- HEAT CAPACITY IS THE SAME FOR ALL NOBLE GASES
Description : Why does metal make a sound when hammered and non-metals not?
Last Answer : Everything makes a sound when hit. Rigid things tend to make more sound because the vibration propagates over the whole shape quickly because the rigid thing is held tightly, so instead of just giving ... -lasting sound at one frequency. Metal is a rigid thing because of its structure. See above.
Description : Which atomic structures go with metals/non metals?
Last Answer : I'm assuming you haven't gotten an answer to your question for 2 months because you're question isn't specific and doesn't really make sense (no offense ) What are you looking you for? I'd be glad ... , I'm a chem eng major and helping ppl with their chemistry helps me remember and get better at it!
Description : Examples of non-metals are ………. , …….. and ……. -Science
Last Answer : Sulphur, chlorine and oxygen.
Description : Non-metals cannot be drawn into wires. Why ? [DAV2008] -Science
Last Answer : Non-metals are not ductile, therefore they cannot be drawn into wires.
Description : How many metals and non-metals are there in periodic table ?
Last Answer : In the periodic table, those metals and 2 non-metals are : - Alkali metals , clay metals , transition elements , interstitial elements , lanthanides , actinides and weak metals are all called metals together. Halogen and inert gases are also non-metals.
Description : What are metals and non-metals ?
Last Answer : Metals: Atoms of elements which produce cations by releasing electrons are called metals. Non-metals: All the elements that receive electrons and are anionized or share electrons during the formation of bonds are called non-metals .
Last Answer : All non-metallic corrosive
Description : Hot conc. `H_(2)SO_(4)` acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following elements is oxidised
Last Answer : Hot conc. `H_(2)SO_(4)` acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which ... products ? A. Cu B. S C. C D. Zn
Description : Non-metals combine with oxygen to form usually
Last Answer : Non-metals combine with oxygen to form usually A. Basic oxides B. neutral oxides C. acidic oxides D. Amphoteric oxides
Description : Compare chemical properties of metals and non-metals.
Last Answer : Compare chemical properties of metals and non-metals.
Description : Can non metals be solids?
Last Answer : Need answer
Description : Why cant flame test be use to identify non metals?
Last Answer : Non metals cannot emit a colored light.
Description : What are some of the non magnetic metals?
Last Answer : Some non-magnetic metals: aluminium, copper, lead, tin, titanium, zinc, brass, bronze, gold, and silver
Description : What compounds only contain non metals?
Last Answer : What is the answer ?
Description : Do all non metals have a dull surface?
Last Answer : Gases for example haven't a surface.
Description : What group of non metals are the most reactive?
Last Answer : The most reactive nonmetal is fluorine. Fluorine is a halogen, which is Group 17 on the Periodic Table, and the halogens are the most reactive...
Description : What are the chemical properties of metals & non-metals?
Last Answer : metals electropositive, basicity, hard, ductile, malleable, sonorous nonmetals electronegative, acidic, brittle, and not all the other three properties.
Description : What happens when metals react with non metals?
Last Answer : they form a salt
Description : India is particularly poor in reserves of (a) coal (b) iron ore (c) non-ferrous metals (d) limestone
Last Answer : Ans: (c)
Description : Elements that show the properties of both metals and non-metals are called (a) Allotropes (b) Metalloids (c) Alloys (d) Colloids
Last Answer : Ans:(b)
Description : Which of the following properties is generally found, in non-metals?' (1) Brittleness (2) Conductivity (3) Ductility (4) Malleability
Last Answer : (1) Brittleness Explanation: An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on nonmetals, they shatter into pieces.
Description : Which one of the following non-metals is not a poor conductor of electricity? (1) Sulphur (2) Selenium (3) Bromine (4) Phosphorus
Last Answer : (2) Selenium Explanation: Selenium is a non-metallic element; it is not a very good conductor of heat and electricity.
Description : Which of the following are properties is generally found in non-metals
Last Answer : Brittleness
Description : The ore only two metals that are Non–Silver in colour, they are–
Last Answer : Copper and gold
Description : Who Classified Elements as Metals and non-metals?
Last Answer : Lavoisier
Description : Elements showing properties of both met- als and non-metals are?
Last Answer : Metalloids
Description : Generally __________ are subjected to galvanising (i.e., zinc coating). (A) Non-ferrous metals (B) Non-metals (C) Low carbon steels (D) Stainless steel
Last Answer : (C) Low carbon steels