Description : Draw the atomic structure of (i) an atom with same number of sub-atomic particles, (ii) an atom with same number of electrons in L and M shell. -Chemistry 9th
Last Answer : (i) Oxygen Number of electrons = 8 Number of protons= 8 Number of neutron= 8 (ii) Argon Atomic number =18=2,8,8 No of electrons in L shell = 8 No of electrons in M shell = 8
Description : What is the sub-atomic particles in the nucleolus of a boron atom?
Last Answer : Need answer
Description : Give the difference between three sub-atomic particles. -Chemistry 9th
Last Answer : Neutron 1. Neutrons are present in the nucleus of an atom. 2. Neutrons are neutral. 3. The mass of a neutron is nearly equal to the mass of a proton. 4. rest mass = 1 Electron 1. Electrons are ... is approximately 1840 times as the mass of an electron. 4. They are closely bound. 5. rest mass = 1
Description : The sub atomic particles of Nucleus are?
Last Answer : Protons and Neutrons
Description : Define the term: i)Tensile strength ii) Hardness iii) Ductility iv) Soldering
Last Answer : i)Tensile Strength : Tensile Strength is the ability of metal to carry a load without breaking. ii)Hardness :- Hardness is the ability of metal to resist wear or abrasion and resist penetration. ... a non ferrous alloy having melting point below 4000 c in between them is called as soldering.
Description : Define electrolytic dissociation.State Arrhenius theory of electrolytic dissociation.
Last Answer : Electrolytic dissociation: - The process of splitting up of an electrovalent compound (Electrolyte) into its ions when dissolved in proper solvent like water is called as electrolytic dissociation. Arrhenius ... that can be present on cation or anion depends upon valency of parent atom.
Description : Define Alloy. Name two methods of preparing alloy.
Last Answer : Alloy :- It is defined as homogeneous mixture of two or more elements one of which must be a metal. Methods of preparing alloy. 1. Fusion 2. Compression
Description : Define electrochemical equivalent. Give its unit.
Last Answer : Electrochemical equivalent: Electrochemical equivalent of an electrolyte is defined as the amount of substance deposited or liberated at an electrode by passing 1 ampere current for one second. OR ... by passing 1 coulomb of electricity through an electrolyte solution. Unit: gms/ coulomb
Description : What are 3 atomic particles that make up an atom?
Last Answer : i think the carbon oxgen and water :P
Description : Atomic number of an element gives (a) The number of protons in its atom (b) The number of nucleons in its atom (c) The weight of the atom of the element (d) The total number of elementary particles in its atom
Last Answer : Ans:(a)
Description : In Rutherford's experiment involving the deflection of alpha particles by atomic nuclei, the fact that some of the alpha particles bombarding the thin gold foil were back-scattered, led to one of the ... its nucleus z) the nucleus of a gold atom occupies nearly the entire space of the atom
Last Answer : ANSWER: Y -- MOST OF THE MASS OF A GOLD ATOM IS IN ITS NUCLEUS
Description : Define : i) Atomic number ii) Atomic mass number iii) Energy level iv) Sub energy level
Last Answer : i) Atomic number: It is defined as; the number of protons present in the nucleus, which exactly balances the number of electrons present in the extra nuclear part. ii) Atomic mass number: It ... : The close grouping of number of energy levels in the main energy level is called sub energy level.
Description : How is thermacole prepared? Write two uses and two properties of thermacole
Last Answer : Preparation :- Thermacole is prepared by blowing air through molten poly styrene or poly urethrane plastics Properties :- 1) It is light in weight 2) It is spongy, porous & has foam like ... for storing ice, ice creams & medicines. 7) It is used as a float for swimming.
Description : Give four properties and its related applications of rubber
Last Answer : Properties of rubber Related application 1. Elasticity For preparation of rubber bands, balloons, tubes for all vehicles 2 .High abrasion resistance For preparation of tyres of all ... air pillows, cushions, mattresses. 9 .Waterproof For preparation of rain coats.
Description : Explain with diagram electromagnetic separation method
Last Answer : Principle- This method is based upon magnetism Process -In this process powdered ore is allowed to fall through hopper on leather or rubber belt which is constantly moving over two ... magnetic impurities 2. concentration of non magnetic ore like Tinstone which contains magnetic impurities
Description : Explain the process of electroplating of an iron spoon with silver.
Last Answer : 1. Electroplating of silver on iron - spoon is carried out in a rectangular steel tank. 2. Iron spoon, which is to be electroplated, is cleaned by boiling with caustic soda in order to remove ... gets slowly dissolve in solution by giving Ag+ ions. The schematic representation is :
Description : Name the type of bonding in water molecule and explain its formation.
Last Answer : Type of bonding : Single co-valent bonding. Formation of Water Molecule: Water molecule (H2O) contains two atoms of hydrogen & one atom of oxygen. Each hydrogen atom is in short ... atom. Thus, two separate single co-valent bonds are formed between hydrogen & oxygen atoms.
Description : Write two properties of glass wool and its uses related to the property.
Last Answer : Properties Uses 1.Low Thermal conductivity 1.Used as thermal insulating material in domestics & industrial appliances such as motors, ovens, refrigerators. 2.Resistant to chemicals ... 5.Low density 5. Manufacturing fiber glass by reinforcing with plastic resins.
Description : Why duralumin sheets are used in making aeroplanes body?
Last Answer : Duralumin sheets possess following properties: 1. Light in weight, tough. 2. Corrosion resistant. 3. Easily castable. 4. Strong as mild steel with good tensile strength. Because of these properties it is used in making aeroplanes body.
Description : What is the affect of temperature on degree of dissociation?
Last Answer : At higher temperature, molecules acquire thermal energy .Hence the velocity of molecules increases and it overcomes the electrostatic force of attraction between ions and separate the ions.Hence degree of ionization increases with increase in temperature.
Description : Differentiate between strong and weak electrolyte.
Last Answer : Strong electrolytes Weak Electrolytes 1) Electrolytes which are highly ionized in solution & hence have high degree of ionization are known as strong electrolytes. 1) Electrolytes which are weakly ionized ... KOH, NaOH 4) e.g. Weak acids - CH3COOH, H2CO3, Weak base-NH4OH
Description : Why chlorine is electronegative? What type of valency it will show with hydrogen.
Last Answer : Chlorine gains one electron from another atom so as to complete its octet therefore chlorine is electronegative. Type of valency with hydrogen : Co-valency.
Description : In FEA, the sub domains are called as . a.particles b.molecules c.elements d.none
Last Answer : c.elements
Description : Nucleons are regarded as composites sub-particles known as – (1) Mesons (2) Quarks (3) Leptons (4) Photons
Last Answer : (2) Quarks
Description : The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the (A) Venturi atomiser (B) Gravity settling chamber (C) Electro-static precipitator (D) Cyclone separator
Last Answer : (C) Electro-static precipitator
Description : Which of the following dust collection equipments is the least efficient (for sub-micronic particles)? (A) Dust catcher (gravity type) (B) Cyclone separator (C) Bag filter (D) Hollow wet scrubber
Last Answer : (A) Dust catcher (gravity type)
Description : What is an important requisite for fillers in dental composite restorative resins in load bearing areas: A. Sub micro sized particles B. High coefficient of thermal expansion C. High in content (High filler)
Last Answer : C. High in content (High filler)
Description : Which of the following is the most significant factor regarding filler in composite for increased strength: A. Particle size 1-3 micron B. Sub micron sized particles C. High concentration of the filler particles
Last Answer : C. High concentration of the filler particles
Description : Nucleons are regarded as composites sub-particles known as (1) Mesons (2) Quarks (3) Leptons (4) Photons
Last Answer : Quarks
Description : In the Gold foil experiment of Geiger and Marsden, that paved the way for Rutherford’s model of an atom, ~ 1.00% of the α-particles were found to deflect at angles > 50º. If one mole of α- -Science
Last Answer : Total number of α particles used for bombardment = 1 mole 1 mole=6.022×1023 particles number of α particles deflected at angles greater than 50°(>50°)= 1% Number of α particles ... at angles less than 50°= 99/100 × 6.022 × 1023 =5.96 × 1023
Last Answer : Atoms are made up of three particles
Description : `._(92)^(238)U` atom distintgrates to `._(84)^(214) Po` with a half life of `4.5xx10^(9)` years by emitting six alpha particles and n electrons. Here
Last Answer : `._(92)^(238)U` atom distintgrates to `._(84)^(214) Po` with a half life of `4.5xx10^(9)` years by emitting ... . Here n is - A. 6 B. 4 C. 10 D. 7
Description : Successive emission of an `alpha`-particle and two `beta`-particles by an atom of an element result in the formation of its
Last Answer : Successive emission of an `alpha`-particle and two `beta`-particles by an atom of an element result in the formation of its
Description : Calculate the separation of the particles and the binding energy of a positronium (an atom consisting of an electron and a position revolving around t
Last Answer : Calculate the separation of the particles and the binding energy of a positronium (an atom ... position revolving around their centre of mass).
Description : The lightest noble gas atom contains the following particles in its nucleus
Last Answer : The lightest noble gas atom contains the following particles in its nucleus A. 4 protons B. 3 neutrons ... and 1 neutron D. 2 protons and 2 neutrons
Description : What two particles of an atom would be attracked to each other?
Description : What are the non-chargered particles that are contained in the nucleus of an atom?
Last Answer : They're called Neutrons.
Description : How many subatomic particles make up an atom?
Last Answer : An atom is made up of three main subatomic particles called protons, neutrons, and electrons.
Description : Electricity is carried within an atom by particles called _______.?
Last Answer : electrons and protons
Description : What are the non-charged particles that are contained in the nucleus of an atom?
Last Answer : Explanation: Neutrons are non charged particles in nucleus. They are present in order to reduce the repulsive forces between two or more positively charged protons, which are also present in the nucleus.
Description : What are non charged particles that are contained in the nucleus of an atom?
Last Answer : Neutrons
Description : Suppose Rutherford had not seen any alpha particles deflected back from the gold foil. How would this most likely have affected scientific understanding of the structure of an atom?
Last Answer : It would have taken scientists longer to discover protons. A+
Description : What particles move around the nucleus of an atom and are negatively charged? (1) Electrons (2) Protons (3) Positrons (4) Neutrons
Last Answer : (1) Electrons Explanation: Circling around outside the nucleus are tiny little particles called electrons. Electrons have a negative charge. Electrons spin as they circle the nucleus billions of times every ... or lose energy, they jump between energy levels as they are rotating around the nucleus.
Description : The fundamental particles present in the nucleus of an atom are - (1) Electron, proton (2) Proton, neutron (3) Neutron, electron (4) Neutron, positron
Last Answer : (2) Proton, neutron Explanation: The nucleus is the very dense region consisting of protons and neutrons at the center of an atom. It was discovered in 1911, as a result of Ernest Rutherford's ... mass of an atom is located in the nucleus, with a very small contribution from the orbiting electrons.
Description : The fundamental particles that composed on atom are
Last Answer : Proton, electron, Neutron
Description : The fundamental particles of an atom?
Last Answer : Proton; Electron and Neutron
Description : ------are negatively (-) charged particles of an atom? A. Protons B. Neutrons C. Electrons (Answer) D. None of These
Last Answer : C. Electrons (Answer)
Description : What are the three subatomic particles of an atom? A. Protons,Neutrons & Electrons (Answer) B. Protons,Nucleus & Electrons C. Protons,Nucleus & Elements. D. Elements,Nucleus & Protons
Last Answer : A. Protons,Neutrons & Electrons (Answer)
Description : Atom is made up of------different kinds of subatomic particles: A. Three (Answer) B. Two C. Four D. None
Last Answer : A. Three (Answer)
Description : All of the followings are particles of the atom except D A. Electrons B. Protons C. Neutrons D. Pentagon
Last Answer : Pentagon