CHE 150 Lecture Notes - Lecture 1: Antoine Lavoisier, Combustibility And Flammability, Boiling Point

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19 Dec 2015

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Che 150- lecture 1- introduction to chemistry: states of matter. Chemistry is the study of composition, structure, and properties of matter and energy and changes that matter undergoes. Matter is anything that occupies space and has mass. Energy is the ability to do work . This is the study of matter and the changes it undergoes can be as simple as understanding the phase transitions of water (h20). Experiment and explanation are the heart of chemical research. An experiment is an observation of natural phenomena carried out in a controlled manner so that the results can be duplicated and rational conclusions obtained. After a series of experiments, a researcher may see some relationship or pattern in the results. If the pattern or relationship is fundamental and we can state it simply, we call it a law. A law is a concise statement or mathematical equation about a fundamental relationship or regularity or nature.

Related Questions

in part A the mass of empty tray was 2.78g
and the mass of tray with stopper was 38.82
the mass of the stopper is 38.82_2.78=36.04
we repeat this thing again with second type of observation and we get 39.2678_2.6409=36.6269
and the we did find the average
in part D we cut the glass and we use the bunse burner to make it smooth that was about 15 min
in Part E when the water was boiling poiling chips were moving a lot and there was so much steam
and then the sodium chloride became powder and a little bit salt
in part F when we mix the sodium iodid and the lead nitrate the mixture became yellow and when we did the filtration the yellow stay on the filter paper but all the water came down
plzzz i need three paragraphs conculsion and i need the answers for the last pictures

Part B, C and D.

Science Tutor: Chemistry Name: Mixtures, Solutions, &Compounds: Chemical Equations Date Chemical Equations If a chemical symbol can be thought of as a letter and a chemical formula as a word in the language of chemistry, then a chemical equation is a statement or sentence. A chemical equation is a shorthand way of describing a chemical reaction between two or more substances. A "+ sign means "combines with." An arrow points away from the reactants and toward the products (See page 10), and an arrow means "yields." 2Na + Cl2 â 2NaCl means sodium combines with chlorine to yield sodiumn chloride (salt) Look closely at the equation above. Notice the "2" in front of NaCI on the right and Na on the left. That 2, called a coefficient, is necessary to make this equation balance. Remember Antoine Lavoisier? (Page 15) Matter is neither created nor destroyed in a chemical reaction. The same number of each kind of atom must be on both sides of a chemical equation. Because chlorine only exists as a molecule consisting of two chlorine atoms, it requires two atoms of sodium to yield two molecules of salt (NaCI). This illustrates another important law stated clearly by the French chemist Joseph-Louis Proust in 1799. Chemical compounds always combine in certain specific fixed proportions. Wherever sodium and chlorine combine, two atoms of sodium will be necessary to react with one molecule of gaseous chlorine. 1 . For the equation 2Mg + O2â 2MgO + energy: A. List the reactant or reactants 2Hato B. List the product or products C. How many atoms of magnesium does it take to combine with one molecule of oxygen? D. How many molecules of magnesium oxide are produced in this reaction? 2. Hydrogen can combine with oxygen to produce water. We could write the equation like this: H2 + O2 â H2O. But this equation is unbalanced! Rewrite this equation with the correct coefficients so that an atom of oxygen doesn't disappear! (Be careful. If you add a coefficient to one side you may have to adjust the other. Count all the atoms.) 3. Now that you have the idea, balance the following equations: A, Pho, â PbO + 02 C. Ca + H2O â Ca(OH)2 + H2 How is following a recipe to mix up a batch of biscuits (or any other food item) similar to Proust's law for chemical reactions? 4. OMark Twain Media, Inc., Publishers 17

CHE 150 Lecture Notes - Lecture 1: Antoine Lavoisier, Combustibility And Flammability, Boiling Point

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