5 Question 8 In water‚ hydrogen bonding occurs between the hydrogen and Answer a hydrogen atom in a different molecule. Comments The correct answer is: an oxygen atom in a different molecule. Max Score: 5 Actual Score: 0 Question 9 Covalent bonds form when one atom _________ its _________ with another atom. Answer shares; electrons Comments Correct!! Max Score: 5 Actual Score: 5 Question 10 Water is an important solvent of life because Answer it forms hydrogen bonds. Comments Correct!!
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After the matter had cooled and spread out‚ these particles combined to form hydrogen and allowed the photons to freely travel without interacting with free electrons‚ forming what we know of today as the Cosmic Microwave Background (CMB). Between 150 million and 1 billion years after the Big Bang (6 < z < 20)‚ structures such as stars‚ galaxies and quasars began to form and release energy sufficient enough to reionize Hydrogen in the intergalactic medium (IGM). However‚ currently no evidence exists
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anions we were testing for could only be determined from one specific result for example if a black precipitate formed following the tests the substance is therefore a sulphide however the same result would also show the presence of carbonate and hydrogen carbonate this therefore means that it is difficult to distinguish between the two and therefore further tests would need to be carried out this test enables you to distinguish clearly between the two and includes adding a drop of phenolphthalein
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old when the super force decays into the separate force of nature. Roughly 3 minutes after the big bang‚ the temperature of the universe have dropped to 1 billion degrees Fahrenheit‚ cool enough for atomic nuclei to form. The element hydrogen forms and some hydrogen atoms fuse to create heliums. During the fourth minute of the big bang‚ reactions took place that locked up the remaining neutrons in helium nuclei. By just over 30 minutes after the big bang‚ all of the positrons (anti-matter) had
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similar number of carbon atoms and physical properties. The uses of the fractions depend on their physical and chemical properties. www.igcse.at.ua Hydrocarbon molecules are only made of a chemical combination of carbon and hydrogen atoms. They are compounds because they consist of atoms of atleast two different elements. THE FRACTIONAL DISTILLATION OF CRUDE OIL www.igcse.at.ua Crude oil is a complex mixture of mainly hydrocarbon compound molecules
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interactions between the toxin and antimicrobial peptide and a global energy -43.23 kcal/mol. The N of Gly22‚ OG1 of Thr42 and OD1 of Asn69 of Diphtheria toxin form conventional hydrogen bonds with O of Ala6‚ O of MSE1 and N of MSE1 respectively of Microcin C7. The CE1 of His21 and CA of Ala62 of Diphtheria toxin form carbon hydrogen bond with O of Asn5 and O of Asn7 respectively of Microcin C7. Tyr65 of Diphtheria toxin forms electrostatic non bond with OXT of Asn7 of Microcin C7. The Pi-orbitals of His
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BINARY COMPOUNDS -Compose of two kinds of atom Polyatomic Ion | Name | OH-1 | hydroxide | SO4-2 | sulfate | PO4-3 | phosphate | NO3-1 | nitrate | CO3-2 | carbonate | HCO3-1 | hydrogen carbonate or bicarbonate | ClO3-1 | chlorate | NH4+1 | ammonium | TWO NON-METALS - Give the name of the positive ion followed by the negative ion ending with -ide -Greek prefixes are used CO-carbon monoxide CO2-carbon dioxide NO-nitrogen
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total number of atoms contained in 2.00 moles of nickel? A) 118 C) 58.9 C) 1 liter of neon D) 1 gram of neon 3) 4) What quantity is represented by the symbol Ne? A) 1 mole of neon B) 1 atomic mass unit of neon 5) How many moles of hydrogen atoms are present in one mole of C2H4(OH)2? A) 6 B) 2 C) 8 D) 4 What is the mass of 3.0 x 1023 atoms of neon? A) 10. g B) 1.0 g C) 20. g D) 0.50 g A sample of nitrogen containing 1.5 x 1023 molecules has the same number of molecules as a sample containing
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If you heat hydrogen to 10 million degrees‚ it creates energy that stars use to shine. When hydrogen is heated to 10 million degrees‚ a process called nuclear fusion takes place. It creates a new‚ heavier element called helium. Some of the matter in this reaction is covered to pure energy which bursts out
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enough for the atomic velocities not to be able to escape the system’s gravity‚ so star formation only occurs in a few areas. The sites of star formation in the galaxy are mostly located within molecular clouds – expansive‚ cool clouds of mostly hydrogen and helium gas. Molecular clouds are on average too diffuse to contract gravitationally‚ but within a cloud are regions of locally higher density‚ which are the sites of active star formation. It is not known exactly what causes molecular clouds
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