Lecture Notes - CH M 115 Lecture Notes CH M 115 Lecture 1...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CH M 115 Lecture Notes CH M 115 - Lecture 1 Matter- the “stuff” of the universe; anything that has mass and occupies space (a.k.a. substance) Composition- the types and amounts of simpler substances that make up a sample of matter Atom- a submicroscopic particle that constitutes the fundamental building block of ordinary matter; the smallest identifiable unit of an element Element- a substance that cannot be chemically broken down into simpler substances Molecule / Compound- two or more atoms joined chemically in a specific geometrical pattern Properties- the characteristics that give each substance a unique identity Physical properties- are the substance shows by itself, without interacting with another substance (color, density, boiling point, melting point, etc…) Physical change- a change that alters only the state or appearance of a substance but not its chemical composition Chemical properties- are those that the substance shows as it interacts with, or transforms into, other substances (flammability, etc…) Chemical change- a change that alters the molecular composition of a substance (heat, energy, etc…) Units- used to specify measurement type I nternational System of Units (SI) Mass (kg) Length (m) Time (s) Temperature (K) Volume (m 3 ) Amount of a substance (mol) Electric current (A) Luminous density (cd) Area (m 2 ) Density (g/cm 3 ) Speed (m/s) Acceleration (m/s 2 ) Energy (J=kg*m 2 /s 2 ) Force (N=kg*m/s 2 ) Pressure (Pa=kg/m*s 2 ) Density- the ratio of an object’s mass to its volume CH M 115 - Lecture 2 Find the density (in g/cm 3 ) of a metal cylinder with a mass of 8.3g, a length of 1.94cm and a radius of 0.55cm. For a cylinder, V= r π 2 l. V= (0.55 π 2 )(1.94)=1.8cm 3 Density= mV = . . 8 3g1 8cm3 =4.5 gcm3 A backyard swimming pool holds 185 cubic yards (yd 3 ) of water. What is the mass of the water in pounds? 1ml=1cm 3 , Water density=1g/cm 3 , 1kg=2.2046 lbs., 2.54cm=1inch *See notes =3.11 * 10 5 lbs. The Toyota Prius, a hybrid electric vehicle, has an EPA gas mileage rating of 52 miles per gallon in the city. How many kilometers can the Prius travel on 15 L of gasoline? 3.7854L= 1gal., 1.6093km=1mi. *See notes =330km How to Solve Chemistry Problems 1. Problem : States all of the information needed to solve the problem. 2. Plan : Clarify the known and unknown. Suggest the steps needed to find the solution. Develop a “roadmap” solution. 3. Solution : Calculations appear in the same order as outlined. 4. Check : Is the result what you expect or at least in the same order of magnitude? 5. Comment : Additional information as needed. Significant Figures- all digits are significant, except zeros that are used only to position the decimal point ....
View Full Document

Page1 / 31

Lecture Notes - CH M 115 Lecture Notes CH M 115 Lecture 1...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online