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Chemistry 105, Week 2 Notes

by: Mylan Siscar

Chemistry 105, Week 2 Notes CHM 105

Marketplace > Oakton Community College > Chemistry > CHM 105 > Chemistry 105 Week 2 Notes
Mylan Siscar

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About this Document

These notes finish Chapter 2 (Scientific Notation and significant figures) and go over Chapter 3 (Matter and Energy).
Elements of Chemistry
Dr. Kaylani Banerjee
Class Notes
Chemistry, chemical formulas, law of conservation of energy, mass, Energy, matter, Density, Calories, Joules
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This 2 page Class Notes was uploaded by Mylan Siscar on Thursday September 8, 2016. The Class Notes belongs to CHM 105 at Oakton Community College taught by Dr. Kaylani Banerjee in Fall 2016. Since its upload, it has received 4 views. For similar materials see Elements of Chemistry in Chemistry at Oakton Community College.


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Date Created: 09/08/16
August 30, 2016 (Chapter 2, continued)  Density Mass d= m o Density= Volume  v o Unit for density is g/cm or g/mL. o cm (or cc’s for students going into medicine) is the same as mL. o Finding the density for solid objects:  Take a graduated cylinder and fill with water.  Place the object into the water gently so that you do not splash any water or break the graduated cylinder.  Figure out the water displacement. (Volume)  Weigh the object using a scale. (Mass) o Finding the density for liquids:  Place a dry and empty container on a scale and tare the scale so that it resets to zero.  Place the liquid into the container to measure the weight of the liquid. (Mass)  Then, measure the volume of the liquid using a graduated cylinder. Chapter 3: Matter and Energy  Matter- Anything that occupies space and has mass. o The three (common) states of matter are solid, liquid, and gas. o Matter undergoes changes  Physical Change in Matter: H O 2 (s) H 2 (liq)H 2 (g)  Chemical Change in Matter (Composition): (C H O ) + O 6 12 6 3 2 CO + H O 2 2 o Matter is composed of two groups:  Pure (Element and Compound)  i.e.: H O 2  Mixture (More than one substance in the system) Heterogeneous mixture- Contents do not mix together. Homogeneous mixture- Contents become one solution.  The solutions are transparent  Composed of a solvent (usually the greater portion of the mixture, usually H O2 and a solute (usually the smaller portion of the mixture)  Law of Conservation of Mass- The amount of mass before a reaction remains the same after the reaction.  Law of Conservation of Energy- The total energy of an isolated system remains constant—it is said to be conserved over time. Energy can neither be created nor destroyed; rather, it transforms from one form to another.  Energy- The capacity to do work o Energy is measured in Joules (J) or Calorie (Cal) o There are two types of energy:  Potential Energy: Made up of position (higher/lower) and composition  Kinetic Energy: Energy in motion o Energy depends on the…  Specific Heat (SH) o  Difference of temperature in C (ΔT = T – f) i  Mass of Water in grams (g) o Calorie- The amount of energy needed to raise the temperature of o 1.0g of water by 1 C  4.184 J = 1 food calorie (Cal) = 1,000 calories (cal) = 10 cal = 1 kilocalorie (kcal) o o o q (Total amount of heat in J)=(mass in g)(SH in J/g C)(ΔT in C) q=g× J ×∆T q(¿J)=g× J ×∆T g℃ g℃


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