CHEM 1332 SPRING 2008 – (NEW) FINAL 1. How much energy is needed to convert 180 grams of ice at -10 ºC to liquid water at 10 ºC? (The molar heat capacity of liquid water is 75.4 J/mol ºC; the molar heat capacity of ice is 40.2 J/mol ºC. The molar heat of vaporization of water is 40.7 kJ/mol. The molar heat of fusion of water is 6.02 kJ/mol.) (A) 71.8 kJ (B) 419 kJ (C) 64.2 kJ (D) 64.6 kJ (E) 11‚620 J 2. Which physical property of a liquid is NOT the result of strong intermolecular
Premium Chemical reaction Chemical kinetics Reaction rate
UNIVERSITY OF PRETORIA UNIVERSITEIT VAN PRETORIA ` DEPARTEMENT OF CHEMISTRY DEPARTMENT CHEMIE DATE / DATUM: TIME / TYD: MARKS / PUNTE: 2008.05.30 120 min 80 Outeursreg voorbehou Fakulteit Natuur- en Landbouwetenskappe CHM 171 EXAMINATION / EKSAMEN Internal Examiners / Interne Eksaminatore: External Examiner / Eksterne Eksaminator: Surname and Initials Van en Voorletters Signature Handtekening Dr FR Vogel Dr RJ Bowen Dr EMM Venter Prof WJ Schoeman Student number Studentenommer Marks
Premium
epidermis and stele. It is multilayered and is made up of parenchymatous cells with big intercellular spaces (NEET-II 2016). Wood of gymnosperms does not contain vessels.e.g- Pinus is vesseless. Vessels are the characteristic feature of angiosperms (AMU 2015). Protoxylem is the major anatomical structural difference which distinguishes dicot stem from dicot root.In dicot stem‚ the protoxylem is present towards the center (Pith)
Premium Plant Seed DNA
vulnerable to any changes3. These changes occurred in 1960 when the Soviet Union decided to use the fresh water from the two rivers that fed the Aral Sea‚ the Amu Darya and Syr Darya‚ to irrigate cotton plantations in Uzbekistan. By 1980 the irrigated area in the Aral Sea basin was 6.5 million hectares which required all the water from the Amu Darya and Syr Darya. These rivers in 1961 provided 55 km3 in fresh water every year to the Aral Sea. However by 1987 once all the cotton irrigation canals were
Premium Water Pollution Ocean
Myth and legends have been of much fascination theme among Iranian authors. This seems to arise from the fact that the stories appeal to children who always want explanations about the puzzling reality around them. Children normally marvel at things their minds find complex and their inquisitive minds long to discover and explain the intriguing reality. For instance‚ children are fascinated by the appearances and actions of especially animals; why are they of different colors‚ shapes and sizes? Why
Premium Religion Folklore Mythology
“A Brief Summary on the Research and Influence of Dr. Jane Goodall” Jane Goodall is a famed English primatologist and ethologist . More than forty-five years of studying chimpanzee‚ or Pan Troglodyte‚ interactions in the wild has helped her become the world’s most famous expert on the animal. This paper will start with how Goodall began researching chimpanzees along with her alternative research methods‚ we will then delve into what are considered the three most important discoveries made by Goodall
Premium Jane Goodall Chimpanzee
Topshop is a British chain of clothing stores that operates in more than 20 countries. It is part of the Arcadia Group‚ which also owns a number of other retail outlets including Burton‚ Dorothy Perkins‚ Miss Selfridge and Wallis. Its primary sales come from a range of products including clothing and fashion accessories‚ and is mainly known for its women’s clothing‚ with Topman having been created in the late 1970s to cater for male customers. The business has also expanded into the online fashion
Premium United Kingdom Topshop England
Empirical Formula of Copper (II) Chloride Gabriella Jane Lukas B1401404 HELP University Empirical Formula of Copper (II) Chloride Objectives 1. To validate that the empirical formula of copper (II) chloride is . 2. To calculate the percent composition of copper in copper (II) chloride. 3. To illustrate the Law of Constant Composition in copper (II) chloride. 4. To study the reaction between copper (II) chloride solution and aluminium metal. Introduction One of the most fundamental statements
Premium Chemistry Chemical element Chemical reaction
Atomic structure: scientists 1. Democritus: 1st person to think of atom (500 BCE)- philosopher Atom is the smallest piece of an element that has same properties as the element. 2. Lavisier: Law of conservation of mass/ matter • Mass can’t be created or destroy; same amount of stuff 3. Joseph Proust: Law of constant composition (law of definite Proportions) • A compound is always made of the same elements in the same ratio. 4. John Dalton: English school teacher who derived the atomic theory
Free Atom Electron Electric charge
Chemistry 200 Exam 1 Review Problems 1. Calculate the number of atoms in 10.0 grams of Fe. 2. Give the mass number‚ #protons‚ #neutrons and #electrons for the isotope strontium-88. 3. Calculate the number of moles of carbon in 50.0 g of benzene C6H6 4. A substance is found to be 38.7 % C‚ 9.7 % H and 51.6 % O by mass. Its molar mass is 62.1 g/mole. What is its molecular formula? 5. Name the following: a) Ca(OH)2 b) KCN c) HClO4(aq) d) FeSO4 e) Na2O f) SF6 g)
Premium Oxygen Sodium hydroxide Mass