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Tuesday, Oct. 15 th : “A” Day Wednesday, Oct. 16 th : “B” Day (early out) Agenda. Ch. 2 review questions? Jeopardy Review Homework: Vocab Puzzle/Concept Review Ch 2 test Next Time! Concept review packets will be due. Chapter 2 Review. Problems on Chapter Review?.
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Tuesday, Oct. 15th: “A” DayWednesday, Oct. 16th: “B” Day (early out)Agenda • Ch. 2 review questions? • Jeopardy Review • Homework: Vocab Puzzle/Concept Review • Ch 2 test Next Time! • Concept review packets will be due
Chapter 2 Review • Problems on Chapter Review?
Ch 2 Short Answer Test Questions • The “Critical Thinking” questions in the Jeopardy review game • are the short answer questions that you will see on the Chapter 2 test!
Matter & Energy Ch.#2
THE RULES: • You will be in 5 teams • The winning team will receive mole money that can be used for 1 point on a test. • The host’s decisions are final
And now…here is the host of Jeopardy… Mrs. Elfline
Let’s Get Ready to play… Today’s Categories are:
Sig Figs & Scientific Notation
Refrigerator Magnets
Vocabulary Sig Figs & Sci. Notation Critical Thinking Calculations! Refrigerator Magnets $100 $100 $100 $100 $100 FJ $200 $200 $200 $200 $200 $300 $300 $300 $300 $300 $400 $400 $400 $400 $400 DD $500 $500 $500 $500 $500
The energy of motion Answer…
Kinetic Energy 100
The kinetic energy of the particles in a sample of matter Answer…
Temperature 200
Any factor that could affect the results of an experiment Answer…
Variable 300
A statement or mathematical expression that describes a behavior of the natural world Answer…
Law 400
What is the measurement 0.0455 rounded to 2 significant figures? Answer…
0.046 100
How many sig figs are in 0.0020 mm? Answer…
2 200
8.40 x 10-2 300
5.5 x 1013 400
3 500
Explain why is an ice cube melting a physical change. Answer…
The water molecules are still water molecules, they haven’t chemically changed. The water has just changed states from a solid (ice) to a liquid (water). 100
Explain the difference between an endothermic process and an exothermic process. Answer…
In an endothermic process, energy is absorbed.In an exothermic process, energy is given off or released. 200
Explain why pictures of atoms and molecules are models. Answer…
Because atoms and molecules are way too small to see, scientists must use models to study their structure and behavior. 300
Why should a scientist record all observations, even those that appear insignificant or don’t agree with the hypothesis? Answer…
ALL scientific observations provide information, even if the information does not agree with the hypothesis. Many scientific discoveries have been made because experiments did not turn out as expected. 400
The mass of a 3.45g piece of aluminum was measured several times. The measured masses were 2.67g, 2.59g, and 2.64g. Use these results to explain the difference between accuracy and precision. Answer…
The measured masses were NOT close to the actual mass of the aluminum, 3.45g, so the measurements were NOT accurate.The measured masses WERE closely grouped together, so they WERE precise. 500
Convert 323 K to ˚C Answer…
50˚C 100
Convert 20˚C to K Answer…
293 K 200
An object has a mass of 57.6 g. Find the object’s density if the volume of the object is 40.25 cm3. Remember sig figs and units! Answer…