400 BC Democritus: He hypothesized that all matter (plus space and time) is composed of tiny indestructible units‚ called atoms. Democritus performed no experiments. 1 .All matter consists of invisible particles called atoms. 2. Atoms are indestructible. 3. Atoms are solid but invisible. 4. Atoms are homogenous. 5. Atoms differ in size‚ shape‚ mass‚ position‚ and arrangement. ->Solids are made of small‚ pointy atoms. ->Liquids are made of large‚ round atoms. ->Oils are made of very fine
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Consumers/ decomposers Hypothesis 1. Given any element and a periodic chart be able to determine the number of protons‚ neutrons and electrons‚ the atomic number and atomic weight‚ the number of valence electrons and the valence (missing number in valence shell) 2. Definitions of a. element b. compound c. trace elements d. isotope e. ion f. isomer (don’t get d‚ e and f mixed up) g. proton h. neutron i. electron 3. Understand how covalent bonds form and the difference between polar covalent
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BIOL 101 September 15‚ 2012 Assignment 1 Chapter 1 2. What is Homeostasis‚ and why is it important? Give some examples that show how systems work together to maintain homeostasis? Homeostasis is a term used to describe an internal environment being in a state of constant conditions‚ such as constant temperature‚ pH‚ and etc. It is important because staying at an equilibrium requires the least amount of energy and provides the perfect environment for desired reactions to occur. If at any given
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Fluorine Moissan discovered fluorine in 1886. It is a chemical element with the symbol F‚ atomic number 9‚ 9 electrons and protons‚ 10 neutrons‚ and the atomic mass of 19. Being the lightest halogen‚ it has one stable isotope‚ fluorine 19. At standard pressure and temperature‚ the element is a pale yellow gas as a liquid its a bright yellow. The electrons are located outside the nucleus of the atom. Electrons are organized in such a way that the space between them are inter dispersed. Within this
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electrolyte (conducts electricity weakly) Citric acid should be soluble in water due to the hydrogenbonds etc. it will also conduct electricity since its a weak acid and will dissociate in water (the protons will contribute the most to the conductivity due to the high transport numbers for protons in water). Vinegar (acetic acid) when an acid is in aqueous solution (dissolved in water) there are many loose hydrogen ions (and therefore lots of loose anions as well). Ionic solutions are good conductors
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highly efficient‚ environmentally friendly manner. Although fuel cells were invented one and a half centuries ago‚ only recently has it become feasible for them to compete with existing energy production systems. Among the various types of fuel cells‚ proton exchange membrane (PEM) fuel cells promise to become a viable power source for transportation as well as a distributed power source for residential uses because of their low operating temperatures and high power density. PEM fuel cells also promise
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Part one: The Lab You will be helping Galileo perform the experiment to determine if objects with different mass fall at the same‚ or different‚ rates in the air and in a vacuum. Before you conduct your experiment‚ you need to form a hypothesis. A hypothesis is a prediction of what you think will happen in the experiment. The hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. Record your hypothesis here:
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Synthesis of Methyl Stearate The purpose of this lab was the convert liquid methyl oleate to solid methyl stearate by catalytic hydrogenation. Firstly‚ we produced hydrogen gas using solid mossy zinc and sulfuric acid. Using the hydrogen produced in the previous reaction‚ we were able to convert the liquid methyl oleate to solid crystals of methyl stearate. A mineral oil was also used to bubbler was used to maintain the hydrogen pressure slightly above the atmospheric pressure and to prevent back-diffusion
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Fischer Esterification Kyle Peterson Chem. 243a Matt Judd‚ Sec. 25 Date Performed: 10/15/03 Abstract: The objective of this experiment is to efficiently perform a fischer esterification of 1-Hexanol to form water and hexyl acetate‚ and to confirm the esterification with a nuclear magnetic resonance (NMR) spectroscopy. It was found that 0.3963 grams hexyl acetate was formed with a percent yield of 33.2%. The product was confirmed using NMR‚ IR‚ and boiling point confirmation. Backround: A Fischer
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decay and can transform to two different atoms: Calcium-40 and Argon-40. Approximately 10.72% of beta decay is K-40 transforming to Ar-40 via electron capture. Electron capture occurs when a proton-saturated atom absorbs an electron from the inner shell and thus transforming a positively charged particle (proton) into a neutral particle (neutron). Since lava is liquid‚ any argon-40 gas previously trapped in lava will be able to escape as gas is less dense than liquid. When there is no argon gas in
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