Sept 14: 1.Why is it important to make careful observations during a lab? 2.Give two examples of physical properties of motor oil. 3.Give two examples of physical properties of substance in the cup. 4.What do you do if there are choking fumes in the lab 5.Which branch of chemistry involves the chemicals not including hydrocarbons? 6.Did the motor oil burn? 7.If the oil could be ignited, would this be an effective and safe way to clean up the oil? Why (not)? 1.So you can interpret your data accurately. 2.Yellow, viscous, less dense than water, hydrophobic. 3.blue, shiny, crystalline solid. 4.Evacuate. (Get out of the room, closing the door behind you.) 5.Inorganic chemistry 6.No, we couldn’t get it to light. 7.No, the fire could spark wildfires and/or cause pollution (which would further harm the wildlife.. 1+ = 14% 2+ = 28% 3+ = 43% 4+ = 57% 5+ = 71% 6+ = 86% 7+ = 100% +.5 =7%

Answers to Homework #3 matter inertia energy potential energy kinetic energy radiant energy law of conservation of mass Anything that takes up space or has mass the tendency of an object to resist a change in motion. the ability to do “work”. etcetera Write definitions to vocabulary words

Next: Write sensible sentences. Matter. In Chemistry we study the properties of matter. Inertia. Inertia is the property which makes it necessary to wear a seatbelt when I am in a car. etcetera.

Do # 6-11 page What is inertia: Inertia is the tendency of an object to resist a change in motion. For example, when a car is in motion, it doesn’t stop immediately when the brakes are applied.

7. Define potential, kinetic and radiant energy. Potential Energy is the “ability” to do work. Kinetic energy is the energy of motion. Radiant energy is energy transmitted by electromagnetic waves.

8. What are the conservation laws of mass, energy and mass energy. Conservation, in Chemistry means that whatever you begin with, still exists at the end. So, the law of conservation of mass states that if you begin with 10 pounds of cake batter, and you weigh the mass of the cake and the gases that escape as the cake is cooked, you will find that there are 10 pounds of cake + gases. The law of conservation of energy states that if you have 100 Calories, you can use 100 calories. The law of conservation of mass/energy states that both the former laws are true, but in nuclear reactions, when mass is converted to energy, the amount of energy “formed” is related to the amount of mass “lost” by Einstein’s equation E = mc 2. No matter or Energy is un-accounted for.

9. What is Chemistry Chemistry is the study of the inter-relationships of the structure and properties of matter. What do substances do, and how do they do it?

10. What is the difference between a chemist and chemical engineer? Chemists do research to develop new materials; Chemical engineers develop ways to produce those materials in large quantities.

11. Differentiate between matter and energy. Matter is “stuff”, matter HAS energy (at least potential energy). Energy is like a verb, it has the ability to make changes occur. Energy can be harnessed to do work.

Chapter 3: Matter HeterogeneousHomogeneous Materials Pure Substances Homogeneous Mixtures Heterogeneous Mixtures Elements, Ions, Compounds Molecules Solutions gas-gas: like air liquid, liquid: alcohol and water liquid, solid, salt water gas, liquid: selzer water Two or more visible phases: Granite, Sand, Chicken noodle soup, ….

Chapter 3: Matter Materials Pure Substances Heterogeneous Mixtures HeterogeneousHomogeneous Elements, Ions, Compounds Molecules

Chapter 3: Matter Materials Heterogeneous Mixtures HeterogeneousHomogeneous Elements, Ions, Compounds Molecules

Chapter 3: Matter HeterogeneousHomogeneous Materials Mixtures Solutions gas-gas: like air liquid, liquid: alcohol and water liquid, solid, salt water gas, liquid: selzer water Two or more visible phases: Granite, Sand, Chicken noodle soup, ….

Changes in Matter Physical Change –Melting –Boiling –Freezing – Condensing –Crystallizing –Dissolving Chemical Change –Reacting with …. to make ….