Chemistry‚ 2014 UNIT 1 – MATTER TRENDS AND CHEMICAL BONDING History of the atom DEMOCRITUS Smallest particle of matter is called an atom Atoms are in constant motion and have empty space between them ARISTOTLE 4 element theory of matter (earth‚ air‚ water‚ fire) Had different combinations of the 4 qualities: hot‚ cold‚ dry‚ moist JOHN DALTON Expanded on Democritus’s theory: All matter is composed of tiny‚ indivisible particles All atoms of an element have identical properties
Free Atom Chemical bond Hydrogen
Determination of Trace Amount of Copper and Zinc in an Aqueous Solution by Atomic Absorbance Spectroscopy Abstract: The purpose of this experiment is to analyze a sample containing copper and zinc in trace amounts‚ where standard addition method was used and the instrument used is the atomic absorbance spectroscopy. The amount of copper obtained was 0.569 ppm ± 0.015 and for zinc we obtained 0.42 ppm ± 0.0027. Introduction: This method implies the excitation of particles in the solution sample
Premium Chemistry Chemical reaction Copper
Fertilizers typically provide‚ in varying proportions: six macronutrients: nitrogen (N)‚ phosphorus (P)‚ potassium (K)‚ calcium (Ca)‚ magnesium (Mg)‚ and sulfur (S); eight micronutrients: boron (B)‚ chlorine (Cl)‚ copper (Cu)‚ iron (Fe)‚ manganese (Mn)‚ molybdenum (Mo)‚ zinc (Zn) and nickel (Ni) (1987). The macronutrients are consumed in larger quantities and are present in plant tissue in quantities from 0.15% to 6.0% on a dry matter (DM) (0% moisture) basis. Micronutrients are consumed in smaller
Premium Fertilizer
Regents Chemistry Quarter 1 Midterm Review 1. The percent by mass of oxygen in Na2SO4 (formula mass = 142) is closest to 1) 11% 3) 45% 2) 22% 4) 64% 2. Given the unbalanced equation: __Al(s) + __O2(g) → __Al2O3(s) 3. 4. 5. 6. 7. balance the equation using smallest whole number coefficients. The percent by mass of aluminum in Al2O3 is approximately 1) 18.9 3) 47.1 2) 35.4 4) 52.9 What is the approximate percent composition by mass of CaBr2 (formula mass = 200)
Premium Water Ideal gas law Melting point
RCA Critical Cleaning Process This paper was especially prepared by Werner Kern‚ the inventor of the RCA clean. Introduction The manufacturing of a silicon integrated circuit (IC) requires 500-600 process steps‚ depending on the specific type of device. Most steps are performed as unit processes with the complete wafers before dicing them into individual chips. Approximately 30% of the steps are cleaning operations‚ which indicate the importance of cleaning and surface conditioning. The device
Premium Oxygen Silicon Semiconductor
Feed I n g r e d i e n t s C a t a l o g ANIMAL ANIMAL NUTRITION NUTRITION RUMINANT SWINE POULTRY AQUACULTURE COMPANION ANIMAL ANIMAL NUTRITION SWINE RUMINANT POULTRY AQUACULTURE COMPANION ANIMAL ANIMAL NUTRITION POULTRY RUMINANT SWINE AQUACULTURE COMPANION ANIMAL ANIMAL NUTRITION AQUACULTURE RUMINANT SWINE POULTRY COMPANION ANIMAL ANIMAL NUTRITION COMPANION ANIMAL RUMINANT SWINE POULTRY AQUACULTURE T A BLE OF CONTENTS Introduction to ADM_ _____________________________________________1
Premium Maize Soybean Amino acid
Precipitation hardening in 2024 Aluminum Lab Report Abstract “Age or Precipitation Hardening” effects on the 2024 Aluminum sample (Al-4%Cu) was investigated by conducting two sets of experiments on 5 samples. In the first experiment‚ 4 of the samples were artificially aged‚ and in the second experiment‚ only one of the 5 samples were naturally aged. In conclusion‚ it is concluded that the hardness of the samples is directly affected by the time and the temperature of the age hardening‚ so as
Premium Tensile strength Materials science Heat treatment
w w w e tr .X m eP e ap UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level .c rs om 5070/11 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB recommended) October/November 2011 1 hour *0909424295* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and
Free Oxygen Oxide Chlorine
Synthesis and Structure of Alcohols Alcohols can be considered organic analogues of water. H O H R O H Alcohols are usually classified as primary‚ secondary and tertiary. H R H OH H primary R R OH R R OH OH R secondary tertiary phenol Alcohols with the hydroxyl bound directly to an aromatic (benzene) ring are called phenols. Nomenclature of Alcohols (Normally any compound’s name which ends in –ol is an alcohol of some sort) IUPAC rules that:
Premium Alcohol
store diatomic molecule (oxygen or nitric oxide)‚ to transfer electrons in oxidation-reduction processes‚ or to catalyze a chemical reaction. The most common of these utilize complexes of Fe and Mg‚ but other micronutrient metals including Cu‚ Mn‚ Mo‚ Ni‚ Se‚ and Zn are also important. Hemoglobin Hemoglobin is one of a group of heme proteins that includes myoglobin‚ cytochrome-c‚ and catalase. Hemoglobin performs the essential task of transporting dioxygen molecules from the lungs to the tissues
Premium Hemoglobin Oxygen Carbon monoxide