1. Review (Grab a white board and markers!)
Chemistry Chapter 2
Review
(Grab a white board and markers!)

2. Test format 24 multiple choice 5 “problems” Choose 2 of 3 essays
Chemical or physical change?
Write symbols or names
(2) temperature conversions
Separation techniques
Choose 2 of 3 essays

3. What is the SI unit of energy?
Define energy
The capacity to do work or produce heat
What is the SI unit of energy?
Joule

4. What is the common unit of energy?
Calorie
What is a calorie based on?
The amount of heat needed to raise the temperature of 1 gram of water by one degree Celcius

5. Describe the three types of energy?
Kinetic – energy of motion
Potential – stored energy
Radiant – energy of light
What type of energy does a boulder perched on a cliff have?
Potential (specifically gravitational potential)

6. What are the three units of temperature that we use??
Fahrenheit, Celcius, and Kelvin
What are Celcius and Kelvin based on?
Celcius - 0°= freezing point of water
100° = boiling point of water
Kelvin – 0 K = absolute zero

7. Which scale has differently sized degrees?
Fahrenheit;
Celcius and Kelvin are the same
What is absolute zero?
The point at which all atomic motion stops

8. The radio says it is 26°C, but the paper says 81°F. Which is hotter?
Convert either measurement, so they match. I choose to convert the radio’s temp to Fahrenheit:
The paper’s temperature is hotter.

9. Convert 28°F to Kelvin
Must first convert F to C!

10. What is the difference between a chemical and a physical change?
Chemical changes the substance into something new, physical does not.
What type of change is a phase change?
Physical

11. Name some phase changes
Melting, solidification, vaporization, condensation, sublimation, deposition
Are these chemical or physical changes?
Sugar dissolving
Sugar melting
Sugar burning
Physical
Chemical

12. What are the two types of pure substances?
Elements and compounds
What are the two types of mixtures? Explain them
Homogeneous – looks the same throughout
Heterogeneous – looks like different parts

13. Define element Define compound
A substance that cannot be separated into simpler substances by a chemical (or physical) change.
Define compound
Two or more elements chemically combined that cannot be separated by physical means

14. What is the symbol for lead? (You may use a periodic table)Pb
What is the name of W?
Tungsten

15. What types of separations can be done on a heterogeneous mixture?
Manually separate
Decanting – pouring off
Filtration – separates solid from liquid
What types of separations can be done on a homogeneous mixture?
Crystallization (allowing to evaporate)
Distillation – boiling point differences 2 miscible liquids
Fractional distillation – more than 2 liquids
Chromatography– different flows in inks or dyes