![]() The formula for density isĬommonly, density is expressed in units of grams per cubic centimeter. So the density of the sugar solution will be 0.5 g.ĭensity is defined as the mass of a unit volume of a material substance. Therefore, the longest wavelength of the radiation will be 343.7 nmĪ 10.0 ml sample of a sugar solution has a mass of 5.0 g. Therefore, making λ (wavelength) the subject H is the plank's constant = 6.626 × 10^-34 J/sĬ is the speed of light in vacuum = 2.9998 × 10^8 m/sĮ is the energy of a photon = 5.778 x 10^-19 Joules Hence energy per bond = 5.778 x 10^-19 Joulesīreaking one bond requires energy equivalent to energy of a photon. Step 1: Energy required to break one bond (kJ/bond) We are required to find the longest wavelength with enough energy to break the C-C bonds. We know that 1 mole of bonds = 6.022 × 10^23 bonds. We are given 348 kJ/mol required to break carbon-carbon bonds. In this question we need to first use the concept of energy of a photon.Įnergy of a photon, E, is given by the formula, E = hf, where h is the plank's constant, f is the frequency.īut since, f is given by dividing speed, c, by wavelength, λ, then Longest wavelength = 343.7 nm Solution and Explanation: This means Marc arrived late for his dinner. Hence, it must have taken Marc 6 hours and 40 minutes to get to his mom's house, meaning he arrived his mom's house at 18:40 (6:40 p.m). In order to get the actual time (in hours and minutes) spent on the road, the ".67" in the answer above will have to be converted to minutes because the clock is not represented in decimal places.Īfter the decimal, 100 will represent 60 minutes hence, The speed and distance are 45 mph and 300 miles respectively (as provided in the question). ![]() Speed (in mph) = distance (in miles) ÷ time (in hours) Marc needed to spend at most 6 hours on the road in order to get to his mom's house early. The symbol used by Dalton for carbon is shown below.Marc left home 12:00 p.m, and his dinner was ready 6:00 p.m (18:00), he needed Dalton published these ideas himself in the following year in the New System of Chemical Philosophy. Dalton's theory of atoms was published by Thomas Thomson in the 3rd edition of his System of Chemistry in 1807 and in a paper about strontium oxalates published in the Philosophical Transactions. Dalton also noted that in series of compounds, the ratios of the masses of the second element that combine with a given weight of the first element can be reduced to small whole numbers (the law of multiple proportions). Sometime prior to the autumn of 1803, the Englishman John Dalton was able to explain the results of some of his studies by assuming that matter is composed of atoms and that all samples of any given compound consist of the same combination of these atoms. The recognition that soot (amorphous carbon), graphite (another form of carbon) and diamond are all forms of carbon.Ī fourth form, buckminsterfullerene, formula C 60, whose framework is reminiscent of the seams in an Association Football ("soccer") ball, is the subject of considerable interest at present and was only discovered a few years ago in work involving Harry Kroto, a Sheffield graduate. Carbon as diamond has also been known since very ancient times. Origin of name: from the Latin word " carbo" meaning " charcoal".Ĭarbon as charcoal, soot and coal has been used since prehistoric times.Discoveror: known since ancient times although not recognised as an element until much later.
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