Periodic Table of Elements 1 1 1 2 Atomic # 3 4 C Solid 5 6 7 8 Metals 9 10 11 Nonmetals 12 13 14 15 16 17 2 18 2 K 1 H 3 Symbol Name Atomic Mass 2 1 He Helium 4.002602 Hydrogen 1.00794 Alkali metals Alkaline earth metals Transition metals Poor metals Other nonmetals Noble gases 4 2 2 2 Li 11 Be Beryllium 9.012182 2 8 1 Hg Liquid H Gas Lanthanoids Actinoids 5 2 3 6 2 4
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A pumpkin is a gourd-like squash of the genus Cucurbita and the family Cucurbitaceae (which also includes gourds).[1] It commonly refers to cultivars of any one of the species Cucurbita pepo‚ Cucurbita mixta‚ Cucurbita maxima‚ and Cucurbita moschata‚ and is native to North America. They typically have a thick‚ orange or yellow shell‚ creased from the stem to the bottom‚ containing the seeds and pulp. Pumpkins are widely grown for commercial use‚ and are used both in food and recreation. Pumpkin pie
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radioactive element. This is the time it takes for one-half of the element in question to "decay" into a daughter element. By using different decay series with different half-lives (uranium-238 to lead-206; uranium-235 to lead-207; thorium-232 to lead-208; rubidium-87 to strontium-87; potassium-40 to argon-40) the estimates can be double-checked and greatly refined (see figure
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ical Chemistry 1.which of the following pairs of compound will react? iC3H6+Br2 iiC3H6+Cl2 in sunlight iiiC3H6+H2O in the presence of sulphuric acid ivC3H6+H2O in the presence of concentrated sulphuric acid a.i b.i‚iii c.i‚ii‚iii d.all 2.liqiud y reacts with magnesium metal to produce a gas that burns with a pop sound when a flaming wooden splint is placed near it.liqiud y is most likely a compound that has the formula a.c2h5oh b.hcooh c.h3cooch3 d.c6h14 3.a compound p has the
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Chemistry Reference Tables Name Avogadro’s number Value 6.022 × 1023 particles/mole 0.0821 L atm mole K L mmHg 62.4 mole K 8.314 L kPa mole K 1.00 atm = 101.3 kPa = 760. mmHg = 760. torr 0°C or 273K 22.4 L Symbol Value Gas constant (R) Standard pressure Standard temperature Volume of 1 mole of any gas at STP Thermodynamic Constants Heat of fusion of water Heat of vaporization of water H f (water) Hv (water) 334 J/g 2‚260 J/g J for ice‚ 2.02 J for steam‚ g°C g°C J for liquid 4.18
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Physics 4052 Spring 2004 Y. Kubota K. Wick Project Proposal for Physics 4052 Introduction You must begin to think about a possible experimental project to carry out next semester (Physics 4052). The reason for this is two-fold: first‚ it will introduce you to the process of proposal writing‚ which is an unavoidable and very important part of modern experimentation‚ and second‚ it will enable us to make any necessary plans for procuring equipment. To start you thinking about this process‚
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The Periodic Table By Eric Scerri 1. I just returned home from being interviewed for a new public television program on the mystery of matter and the search for the elements. It was very gratifying to see how keen the film-makers were on understanding precisely how Mendeleev arrived at his famous first periodic table of 1869. This in turn meant that I had to thoroughly review the literature on this particular historical episode‚ which will form the basis of this blog. 2. The usual version of how
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| |AlF3 |ionic |giant lattice/ionic | |AlCl3 |covalent |simple molecular | 2. (a) Krypton (noble gas) and Rubidium (Group I metal) Kr has a simple molecular structure and Rb has a giant metallic structure. Larger amount of energy is needed to overcome the stronger electrostatic attraction between Rb+ and its mobile electrons than the weaker van der Waals’
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Drinking Tap-water is better than Bottled Water Bottled water is simply water from some sources that a company has placed in a bottle for resale. It can have minimal processing – as in natural spring or mineral water‚ or it can be completely filtered and dematerialized which is to remove minerals in the water to nearly pure‚ and then added minerals back into the water to make it taste better. In these days‚ “we drink 15 times more bottled water today than we did in 1976. According to the NRDC
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Potassium Lilac to red Li Lithium Magenta to carmine Mg Magnesium Bright white Mn(II) Manganese(II) Yellowish green Mo Molybdenum Yellowish green Na Sodium Intense yellow P Phosphorus Pale bluish green Pb Lead Blue Rb Rubidium Red to purple-red Sb Antimony Pale green Se Selenium Azure blue Sr Strontium Crimson Te Tellurium Pale green Tl Thallium Pure green Zn Zinc Bluish green to whitish green Sources of error for the flame test: The test cannot
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