Ion- # of electrons (top right # on atomic symbol) H‚ H‚ H Cation(metal)- lost/less electrons(+) Anion (non-metal)- gained/more electrons(-) Calculating Average Atomic Mass from isotope masses and percentages Average Atomic Mass= (amu x .%)+ (amu x .%)= aam Atomic Theories Dalton Thomson Rutherford Gold-Foil Experiment Shot alpha particles at gold foil; the particles either went straight through‚ or bounced back at large angles Atoms‚ Molecules‚ Formula Units‚ Mole‚ Mole
Premium Atom Stoichiometry Chemistry
from the vast quantities of fish present in the lake and the preserving of the surrounding soil for agriculture. The Aral Sea has been fed by two main rivers‚ the Syr Darya on the east which flows into the sea through the north of the lake and the Amu Darya River which flows into the south of the sea. Thompson (2008) highlights that both rivers flow from the Pamir Mountains and once provided four fifths of the seas volume while the remaining one fifth was supplied by rainfall. It is known that the
Premium
has a mass of 68.92558 amu. Ga-71 is 39.892% abundant and has a mass of 70.9247005 amu. average atomic mass = .60108 x 68.92558amu .39892 x 70.9247005 average atomic mass = 69.723amu The Mole (Section 3.2) In chemistry‚ we use the counting unit of a mole (mol). This is defined as the amount of particles that are in exactly 12.00 g of the isotope 12C. This number is 6.022 x 1023. Using this same relationship‚ it can be reasoned that 6.022 x 10 23 amu = 1.000 g. Therefore
Premium Stoichiometry
Kinetic Theory Objectives • Describe how the kinetic-molecular theory is used to explain how gases behave at different temperatures. (Exploration 1) • Analyze data that shows how gas particle mass affects that gas’s behavior. (Exploration 2) • Describe the Maxwell-Boltzmann Distribution. (Explorations 1 and 2) Description of Activity The kinetic-molecular theory states that a collection of gas molecules’ average kinetic energy has a specific value at any given temperature
Free Gas Temperature Oxygen
Effects of the Mind-Body Connection on Learning Jason Grant COLL100 B161 American Military University Professor Allison Knox Effects of the Mind-Body Connection on Learning What is the “Mind-Body Connection” and does it have a profound effect on an individual’s learning? The mind-body connection can be explained as the physical and mental connection that our existence has on itself and the world around it. Some researchers have noted that this connection can be stronger in certain situations
Premium Brain Mind Nervous system
moles-stoichiometry-practice-problems Now you’re ready to use what you know about conversion factors to solve some stoichiometric problems in chemistry. Almost all stoichiometric problems can be solved in just four simple steps: 1.Balance the equation. 2.Convert units of a given substance to moles. 3.Using the mole ratio‚ calculate the moles of substance yielded by the reaction. 4.Convert moles of wanted substance to desired units. These "simple" steps probably look complicated at first
Premium Mole Atom Molecule
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