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q atomic mass of an elementthe number at the bottom of every square in the periodic table is the atomic mass of that element in amu a scan of the
q define atomic mass unitsatomic mass scientists have set up a standard for the measurement of atomic mass by assigning the carbon-12 atom a mass of
q determine the number of neutronsisotopes of an element can as well be specified by writing the mass number of the isotope following a hyphen after
q what do you mean by isotopesisotopes and mass number although all atoms of an element have the same number of protons most elements have atoms with
q how to calculate atomic numberatoms have no net electrical charge for the reason that they contain equal numbers of electrons and protons therefore
q describe about atomic numberit is significant to be able to obtain useful information from the periodic table beginning with the simplest element
q illustrate about nuclear particlein 1932 rutherford with chadwick demonstrated the existence of the neutron a nuclear particle having no charge but
q what do you mean by nucleus of the atomthe nucleus of an atom for the reason that atoms have no net electrical charge scientists reasoned that if
q describe subatomic particles and the nuclear atomone of the most significant results of daltons theory was that it generally persuaded scientists
q explain daltonrsquos atomic theorythe atomic theory in 1808 john dalton projected a theory to explain the laws of conservation of matter definite
q early theories of matterin ancient greece philosophers discussed the nature of matter the philosopher democritus held that matter was composed of
q what is law of definite proportionsa given compound is forever composed of the same elements in the same proportion by mass this fact is recognized
q what is compounda compound is a substance which consists of two or more elements chemically combined the elements in a compound arent simply
q describe about groups or families in periodic tableevery element may be represented by a one or two letter symbol in the middle of nineteenth
q define elements and compoundspure substances are categorized into two categories that are elements and compounds an element is a substance that
q define homogeneous mixturea homogeneous mixture is one which has a constant composition throughout by mixed sugar in water you create a homogeneous
q explain about heterogeneous mixturea heterogeneous mixture is one that isnt blended smoothly throughout illustrations of heterogeneous mixtures
q what do you mean by mixtures of mattera mixture is a mixture of two or more pure substances in which each substance retains its individual
a reaction among sodium hydroxide and hydrogen chloride gas produces sodium chloride and water and a reaction of 2285g of sodium hydroxide with 2082g
when a result of barium nitrate and a solution of copperii sulphate are mixed a chemical reaction produces solid barium sulphate which sinks to the
when heated calcium hydroxide as well as ammonium chloride reacts to produce water vapor ammonia gas and solid calcium chloride presume 500g of
a covered glass tube contains 225g of copper and 332g of sulphur the mass of the tube as well as its contents is 1848 g upon heating a chemical
q example on law of conservation of massa slim strip of iron with a mass of 1572 g is placed in to a solution containing 2112 g of copper and copper
q explain about conservation of massconservation of mass above two centuries ago chemists established a fundamental law called the law of
a chemical change takes place when one or more substances change into new substances a chemical change is as well known as a chemical reaction the