C10H15N, pervitin vagy anadrex néven is ismert, vegyület érdekelne. Hörgőtágító élénkítő hatású, serkeni az agymüködést. Sajnos csak receptre váltható ki, de szintetikus anyagokból létrehozható csak nem tudom, hogy kell előállítani.C10H15N (Metanfetamina) Masa molar. Peso Molecular de C 10 H 15 N . 149.2328 g/mol. La masa molar y el peso molecular de C 10 H 15 N es 149,233.LOS ANGELES, May 27, 2021 /PRNewswire/ -- 6Connex, the leading global platform for virtual and hybrid events, announced today that the National Mu... LOS ANGELES, May 27, 2021 /PRN...Advertisement Give a complete and thorough overview of the competitive market. Cover not only the directly competing companies you face (those who offer a very similar product with...Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. Since there is an equal number of each element in the reactants and products of C8H9NO2 + NaOH + 3CH3OH = C10H15N + NaHCO3 + 3H2O, the ...Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. 12 NH4HCO3 + 13 C10H8 + 8 H2O = 12 C10H15N + 22 CO2. Reactants.(+/-)-Methamphetamine-d8 | C10H15N | CID 117065071 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological ...Since there is an equal number of each element in the reactants and products of C10H15N + HCl = C10H16ClN, the equation is balanced. Balance C10H15N + HCl = C10H16ClN Using Inspection The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at the end of a chemical ...The Insider Trading Activity of Rosman Adam L. on Markets Insider. Indices Commodities Currencies StocksThe Automated Topology Builder (ATB) and Repository is intended to facilitate the development of molecular force fields for Molecular Dynamics or Monte Carlo simulations of biomolecular systems. Applications include the study of biomolecule:ligand complexes, free energy calculations, structure-based drug design and refinement of x-ray crystal ...Methamphetamine has the chemical formula C10H15N and a molecular mass 149.233 g/mol. It enters the brain and triggers a cascading release of norepinephrine, dopamine and serotonin. To a lesser extent …Calculando a massa molar passo a passo; Primeiro, calcule o número de cada átomo em C 10 H 15 N(g): C: 10, H: 15, N: 1. Em seguida, pesquise os pesos atômicos para cada elemento da tabela periódica: C: 12.0107, H: 1.00794, N: 14.0067Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. 2 C10H8 + 3 NH4OH + 5 C2H5OH = …6 Information Sources. N- (111C)methyl-1-phenylpropan-2-amine | C10H15N | CID 450464 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. Benzenemethanamine, N,N,4-trimethyl- | C10H15N | CID 138102 - structure, chemical names, physical and chemical properties, classification, patents, literature ... Rating Action: Moody's affirms MISC's Baa2 rating; outlook remains stableRead the full article at Moody's Indices Commodities Currencies StocksLearn how methamphetamine is produced from ephedrine or pseudoephedrine and other chemicals in large or small labs. Find out why meth production is dangerous and illegal, and how it affects the …Computed by PubChem 2.2 (PubChem release 2021.10.14) Dates. Create: 2005-03-27. Modify: 2024-04-27. Description. 4-Methylamphetamine is a natural product found in Thymus quinquecostatus with data available. LOTUS - the natural products occurrence database. Since there is an equal number of each element in the reactants and products of C10 + H15 + N = C10H15N, the equation is balanced. Balance C10 + H15 + N = C10H15N Using Inspection The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at the end of a chemical reaction ... N-Isopropylbenzylamine | C10H15N | CID 66024 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities ...Calculando a massa molar passo a passo; Primeiro, calcule o número de cada átomo em C 10 H 15 N*HCl: C: 10, H: 16, N: 1, Cl: 1. Em seguida, pesquise os pesos atômicos para cada elemento da tabela periódica:2024-05-11. Description. N-butylaniline appears as an amber colored liquid. Slightly denser than water and insoluble in water. May be toxic by skin absorption and ingestion. Severely irritates skin and eyes. Used to make dyes. CAMEO Chemicals.メタンフェタミン （ 英語: methamphetamine, methylamphetamine ）は、 アンフェタミン の窒素原子上に メチル基 が置換した構造の 有機化合物 である。. 間接型アドレナリン受容体刺激薬として中枢神経興奮作用はアンフェタミンより強く、強い中枢興奮作用および ...C10H15N (Metanfetamina) Masa molar. Peso Molecular de C 10 H 15 N . 149.2328 g/mol. La masa molar y el peso molecular de C 10 H 15 N es 149,233.Sep 12, 2020 · The drug has been around for many decades now. In the past, C10h15n had many uses before it was illegalized. Soldiers of way would use it during battle to increase alertness. Additionally, it was very popular as a weight loss drug. However, the drug was banned in the 70s when it became a drug of abuse among addicts. 甲基苯丙胺. 甲基苯丙胺 或 甲基安非他命 （英語： methamphetamine ，全名 N-methylamphetamine [note 1] ）， 化学式 ：C₆H₅CH₂CH (CH₃)NHCH₃（ N-甲基-1-苯基丙-2-胺 、 N-甲基-α-甲基苯乙胺 ），其 结晶 形态俗稱 冰毒 、黑话「 豬肉 」，是一种強效 中樞神經系統 興奮劑 ...DL-Methamphetamine | C10H15N | CID 1206 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. Since there is an equal number of each element in the reactants and products of C10 + H15 + N = C10H15N, the equation is balanced. Balance C10 + H15 + N = C10H15N Using Inspection The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at the end of a chemical reaction ... Spectra: ESR (2,000), 1H NMR (13,900), 13C NMR (12,000), IR (49,000), MS (21,800), Raman (3,500) EPA Reference Absorbance Spectra. This covers spectra of 189 air pollutants mandated by Title III of the Clean Air Act. Spectra are grouped by chemical name, CAS # and molecular formula. Experimental measurement details such as cell …Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. 20 C8H9NO2 + 19 NaOH + 15 NH3 = 16 C10H15N + 19 NaNO3 + 2 H2O. Reactants.If you're vexed by the meaning of your life, existential therapy can help you explore some of the deeper questions. Not all forms of therapy focus solely on the past. In existentia...C10H15NO + HI = C10H15N + H2O + I2 - バランスのとれた化学式. 下の計算機を使用して化学式のバランスをとって反応のタイプを決定します （手順） 。. 化学式バランサ.Expert-verified. From Mass spectrum Molecular weight of unknown compound is given m/z = 149 Molecular formula = C10H15N from this first we should find the Index of Hydrogen Deficiency (HDI) degrees of unsaturation Formula for degree of unsaturation or HDI = …. Problem 16 3408 IR Spectrum (liquid film) 4000 3000 2000 1600 1200 800 V (cm) 100 ...A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The N,N-DIETHYLANILINE molecule contains a total of 26 bond (s). There are 11 non-H bond (s), 6 multiple bond (s), 3 rotatable bond (s), 6 aromatic bond (s), 1 six-membered ring (s), and 1 tertiary amine (s) (aromatic).Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. 26 C3H8O + 3 NH3 = 3 C10H15N + …More than $40 billion is sent to sub-Saharan Africa annually via money transfers, according to the World Bank. Mali ranks ninth among African nations for remittances sent back to t...A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The phentermine molecule contains a total of 26 bond (s). There are 11 non-H bond (s), 6 multiple bond (s), 2 rotatable bond (s), 6 aromatic bond (s), 1 six-membered ring (s), and 1 primary amine (s) (aliphatic).3,4-Dimethylphenethylamine | C10H15N | CID 410083 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological ...Citralva. Molecular Formula CHN. Average mass 149.233 Da. Monoisotopic mass 149.120453 Da. ChemSpider ID 20458.Features. This product is qualified as a Reference Material that has been manufactured and tested to meet ISO/IEC 17025 and ISO 17034 international standardsC10H15N + O2 = CO2 + H2O + CH4N2O is a Combustion reaction where two moles of D-Methamphetamine [C 10 H 15 N] and twenty-six moles of Dioxygen [O 2] react to form nineteen moles of Carbon Dioxide [CO 2], thirteen moles of Water [H 2 O] and one mole of Urea [CH 4 N 2 O] Show Chemical Structure Image.The uses of c10h15n.hcl are diverse - so search around and find precisely what you need. Organic intermediate compounds can be ordered in any quantity at affordable wholesale prices, driving the price of chemical production as low as possible. They tend to come in powder or flake format, although some are stored as liquids .2-tert-Butylaniline | C10H15N | CID 80574 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities ... 4-tert-Butylaniline | C10H15N | CID 69861 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities ... N,N-Dimethylphenethylamine. Molecular Formula CHN. Average mass 149.233 Da. Monoisotopic mass 149.120453 Da. ChemSpider ID 23470.The fintech firm has listed the fact that it is a "foreign-owned and controlled company" as a risk in the IPO DRHP filed with SEBI. For several years now, Vijay Shekhar Sharma, a f...Jul 13, 2022 · Methamphetamine is a stimulant. Methamphetamine use: increases heart rate. increases blood pressure. elevates body temperature. quickens the breathing rate. dilates the pupils. Other side effects include temporary hyperactivity, insomnia (trouble sleeping), anorexia (loss of appetite) and tremors or "shakes". C10H15N (Metanfetamina) Masa molar. Peso Molecular de C 10 H 15 N . 149.2328 g/mol. La masa molar y el peso molecular de C 10 H 15 N es 149,233. 2-Cyclohexylidenebutanenitrile | C10H15N | CID 294523 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological ...Methamphetamine | C10H15N | CID 10836 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, …N,N-Dimethylphenethylamine. Molecular Formula CHN. Average mass 149.233 Da. Monoisotopic mass 149.120453 Da. ChemSpider ID 23470.The chemical formula for methamphetamine, a very gross, disgusting, and addicting drug. Don't do meth, it's gross.Balance C9H10O + CH3NH2 = C10H15N + O2 Using Inspection. The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at the end of a chemical reaction as at the beginning. To be balanced, every element in C9H10O + CH3NH2 = C10H15N + O2 must have the same number of …Traveling is a complicated ordeal. To make things a little simpler and help you communicate with loved ones, we've made a comprehensive travel info sheet you can modify, print out,...The molecular weight of METHAMPHETAMINE is determined by the sum of the atomic weights of each constituent element multiplied by the number of atoms, which is calculated to be: 149.2328 ⋅ g mol 149.2328 · g m o l. The exact term of the above molecular weight is “molar mass”, which is based on the atomic mass of each element.Methamphetamine drug profile. A synthetic substance. Normally seen as a white powder, it acts as a stimulant of the central nervous system (CNS). First manufactured in Japan in 1919, methamphetamine has some limited therapeutic use, but most is manufactured in clandestine laboratories, particularly in the USA and the Far East.Meth & Phetamine · Song · 20162024-05-11. Description. N-butylaniline appears as an amber colored liquid. Slightly denser than water and insoluble in water. May be toxic by skin absorption and ingestion. Severely irritates skin and eyes. Used to make dyes. CAMEO Chemicals.Its IUPAC name is N-methyl-1-phenylpropan-2-amine. Its chemical make up is C10H15N with a molecular mass of 149.233 g/mol. Methamphetamine is a member of the phenethylamine family, which is comprised of stimulants and hallucinogens. Methamphetamine has two enantiomers. The S-isomer is the one that is being described.Phenpromethamine | C10H15N | CID 22276 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities ...Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. Since there is an equal number of each element in the reactants and products of C10H15N + H2O = C10H17NO, the equation is balanced.Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. Since there is an equal number of each element in the reactants and products of C8H9NO2 + NaOH + 3CH3OH = C10H15N + NaHCO3 + 3H2O, the ...N,N-Diethylaniline. Molecular Formula CHN. Average mass 149.233 Da. Monoisotopic mass 149.120453 Da. ChemSpider ID 6794.C 10 H 15 N. C. 10. H. 15. N. 化学式 C10H15N 的化合物（摩尔质量 149.23 g/mol）可以指：.CAS has added experimental spectra for over 700,000 compounds in the Registry database. IR, MS and NMR spectra are from Wiley spectral databases and the Japanese SDBS database, plus ~75,000 experimental 13C and 1H NMR spectra from BioRad-Sadtler. In addition, there are millions of predicted proton and 13C NMR spectra from ACD Labs.Methamphetamine drug profile. A synthetic substance. Normally seen as a white powder, it acts as a stimulant of the central nervous system (CNS). First manufactured in Japan in 1919, methamphetamine has some limited therapeutic use, but most is manufactured in clandestine laboratories, particularly in the USA and the Far East.Since there is an equal number of each element in the reactants and products of 10CH3 + HN + 16OH = C10H15N + 16H2O, the equation is balanced. Balance CH3 + HN + OH = C10H15N + H2O Using Inspection The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at …甲基苯丙胺. 甲基苯丙胺 或 甲基安非他命 （英語： methamphetamine ，全名 N-methylamphetamine [note 1] ）， 化学式 ：C₆H₅CH₂CH (CH₃)NHCH₃（ N-甲基-1-苯基丙-2-胺 、 N-甲基-α-甲基苯乙胺 ），其 结晶 形态俗稱 冰毒 、黑话「 豬肉 」，是一种強效 中樞神經系統 興奮劑 ...Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. C10H15NO + 2 HCl = C10H15N + H2O + Cl2. Reactants.May 4, 2024 · 약물의 주요한 특징은 강력한 각성 효과, 성욕 증가, 집중력 증가, 인지능력 증가, 육체적인 행복감, 사고 가속, 사교성 및 실행 동기 증가 등이 있다. 소량 복용 시 집중력과 신체적 활력을 높여주는 효과가 있고, 다량을 복용하면 극단적인 행복감을 느끼게 된다 ... Computed by PubChem 2.2 (PubChem release 2021.10.14) Dates. Create: 2005-03-27. Modify: 2024-04-27. Description. 4-Methylamphetamine is a natural product found in Thymus quinquecostatus with data available. LOTUS - the natural products occurrence database. Balanced Chemical Equation. 2 C 9 H 10 O + 2 CH 3 NH 2 + 0 HCOOH → 2 C 10 H 15 N + O 2. Warning: Some compounds do not play a role in the reaction and have 0 coefficients. Make sure you have entered the equation properly. ⬇ Scroll down to see reaction info and a step-by-step answer, or balance another equation. Former consultant James Oliver found a way to fill a market void thanks to an HGTV show. Now he's running and managing his own business, WeMontage. By clicking "TRY IT", I agree to...3,4-Dimethylphenethylamine | C10H15N | CID 410083 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological ...C10h15n | Sigma-AldrichMethamphetamine has the chemical formula C10H15N and a molecular mass 149.233 g/mol. It enters the brain and triggers a cascading release of norepinephrine, dopamine and serotonin. To a lesser extent …To calculate the stoichiometry of C3H8O + C6H8O7 + NH4OH = C10H15N + H2O you must balance the equation to find the stoichiometric mole ratio of each compound. The equation can be balanced using the chemical equation balancer.The stoichiometry calculator above shows the mole ratios/coefficients of the balanced equation, 22 C 3 H 8 O + 4 C 6 H 8 O …4-Amylpyridine. Molecular Formula CHN. Average mass 149.233 Da. Monoisotopic mass 149.120453 Da. ChemSpider ID 65750.You may have to sit through more of those commercial breaks. Snapchat might be going the way of YouTube. The messaging and camera app, which has been wary of forcing ads on its aud...Marketplace is a convenient destination on Facebook to discover, buy and sell items with people in your community.N,N-Dimethylphenethylamine | C10H15N | CID 25125 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, … A substance is added that will bind to the meth, and the liquid meth is then drained out. Hydrogen chloride gas is bubbled through the liquid meth, making it a crystalline hydrochloride salt. This is poured through a filter cloth, and the meth that is left on the filter is then dried. Once dry, the meth is "stepped on" (mixed down with inert ... Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. Since there is an equal number of each element in the reactants and products of 5C6H8O7 + 47C3H8O + 9CH4N2O = 18C10H15N + 91H2O, the ... Chemical Identifier Search | C10H15N. Matches any text strings used to describe a molecule. Systematic Name, Synonym, Trade Name, Registry Number, SMILES, InChI or CSID. Search Hits Limit: Metamfetamin je značně rozšířen ve Spojených státech a Asii. V Evropě se zejména vyskytuje na území bývalého Československa, kde je nezákonně syntetizován, již od 70. let, z pseudoefedrinu extrahovaného z léčiv proti chřipce a rýmě (Nurofen stopgrip, Modafen, dříve i aspirin apod.) v amatérských varnách.DL-Methamphetamine | C10H15N | CID 1206 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.メインページ; コミュニティ・ポータル; 最近の出来事; 新しいページ; 最近の更新; おまかせ表示; 練習用ページ; アップロード (ウィキメディア・コモンズ)(+/-)-Methamphetamine-d8 | C10H15N | CID 117065071 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological ...Disclaimer. We are doing our best to compile high quality databases. However, there are no such databases without any errors or mistakes. We make no warranties to those effects and shall not be liable for any damage that may result from errors in the database.指令. 若需平衡化学方程式，输入一个化学反应方程式，然后按平衡键。平衡方程将出现在上方。 元素中的第一个字符使用大写字母，第二个字符使用小写字母。例子：Fe, Au, Co, Br, C, O, N, F。A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The phentermine molecule contains a total of 26 bond (s). There are 11 non-H bond (s), 6 multiple bond (s), 2 rotatable bond (s), 6 aromatic bond (s), 1 six-membered ring (s), and 1 primary amine (s) (aliphatic).C10 + H15N = C10H15N - Dengeli Kimyasal Denklem. Kimyasal denklemleri dengelemek için aşağıda bulunan hesaplayıcıyı kullanın ve reaksiyon türünü belirleyin (talimatlar). Kimyasal Denklem Dengeleyici.
C10H15N là công thức chung của một loạt hợp chất hữu cơ có chứa nhóm chức toàn phần C10H15N. Việc tìm hiểu về cách điều chế một hợp chất cụ thể trong loạt này cần một mức độ chi tiết và chuyên sâu hơn. Tuy nhiên, dưới đây là một phương pháp tổng quát để điều .... Brazilian wax corpus christi
Phentermine solution. Empirical Formula (Hill Notation): C10H15N. CAS No.: 122-09-8. Molecular Weight: 149.23. P-023. 1.0 mg/mL in methanol, ampule of 1 mL, certified …Features. This product is qualified as a Reference Material that has been manufactured and tested to meet ISO/IEC 17025 and ISO 17034 international standards2-Cyclohexylidenebutanenitrile | C10H15N | CID 294523 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological ... A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The phentermine molecule contains a total of 26 bond (s). There are 11 non-H bond (s), 6 multiple bond (s), 2 rotatable bond (s), 6 aromatic bond (s), 1 six-membered ring (s), and 1 primary amine (s) (aliphatic). N,N,3,5-Tetramethylaniline | C10H15N | CID 78625 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological ... A substance is added that will bind to the meth, and the liquid meth is then drained out. Hydrogen chloride gas is bubbled through the liquid meth, making it a crystalline hydrochloride salt. This is poured through a filter cloth, and the meth that is left on the filter is then dried. Once dry, the meth is "stepped on" (mixed down with inert ...Example 12.2.2: Pentan-3-one. This time the base peak (the tallest peak - and so the commonest fragment ion) is at m/z = 57. But this is not produced by the same ion as the same m/z value peak in pentane. If you remember, the m/z = 57 peak in pentane was produced by [CH 3 CH 2 CH 2 CH 2] +.C10H15N (Metanfetamina) Masa molar. Peso Molecular de C 10 H 15 N . 149.2328 g/mol. La masa molar y el peso molecular de C 10 H 15 N es 149,233. Composición de Metanfetamina - C 10 H 15 N . Elemento Símbolo Masa Atómica # de Átomos Porcentaje de Masa; Carbono: C: 120.107 g/mol: 10: 80.483%: Hidrógeno: H: 15.1191 g/mol: 15:A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The phentermine molecule contains a total of 26 bond (s). There are 11 non-H bond (s), 6 multiple bond (s), 2 rotatable bond (s), 6 aromatic bond (s), 1 six-membered ring (s), and 1 primary amine (s) (aliphatic).Chemical Identifier Search | C10H15N. Matches any text strings used to describe a molecule. Systematic Name, Synonym, Trade Name, Registry Number, SMILES, InChI or CSID. Search Hits Limit:3-sec-Butylaniline. Molecular Formula CHN. Average mass 149.233 Da. Monoisotopic mass 149.120453 Da. ChemSpider ID 45518.The hexane spectrum shows a moderately abundant molecular ion at m / z = 86 and fragment ions at m/z = 71, 57, 43, and 29. Since all the carbon–carbon bonds of hexane are electronically similar, all break to a similar extent, giving rise to the observed mixture of ions. Figure 12.6 Mass spectrum of hexane (C6H14; MW = 86).Niantic, the game developer behind Pokémon GO, has raised $470 million — most recently at a $4 billion valuation — largely on the promise that it can translate the mainstream succe...The Insider Trading Activity of Rosman Adam L. on Markets Insider. Indices Commodities Currencies StocksEnter a chemical formula to calculate its molar mass and elemental composition: Molar mass of C10H15N (Diethylaniline) is 149.2328 g/mol. Get control of 2022! Track your food intake, exercise, sleep and meditation for free. Convert between C10H15N weight and moles. Compound. Since there is an equal number of each element in the reactants and products of C10 + H15 + N = C10H15N, the equation is balanced. Balance C10 + H15 + N = C10H15N Using Inspection The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at the end of a chemical reaction ... .