Semester 1 Review

What is science? Using scientific method to understand the world (system) around us.

What is a theory? Explanation of a pattern seen in natural world. Based on facts, considered reliable

Conversions

Convert 35 meters to centimeters Meters are bigger then centimeters so there should be more centimeters than meters 35 meters = 3500 centimeters

What is a system of knowledge and the methods used to find that knowledge? A. technology b. curiosity c. science

What is an explanation of a pattern seen in nature that is based on facts? A. hypothesis b. theory c. law

Heterogeneous verses Homogenous Heterogeneous Mixed, you can see separate pieces Homogenous Every piece is the same

Physical and Chemical changes Physical Just changes form Chemical The elements that make it up are changed.

A mixture that appears to contain only one substance. A. heterogeneous b. homogeneous

A jar of mixed nuts is which type of mixture. A. heterogeneous b. homogeneous

Which of the following is evidence of a chemical change? A. boiling water b. gas created c.melting wax

States of matter

Gas pressure and Boyle’ Law

Which of the following is a chemical change? A. boiling water b. gas created c.melting wax

Phases of matter States and how we get in between them.

Endo and exothermic Endothermic Endo=in Takes in energy, molecules with more energy start to move around Exothermic Exo=exit Takes in energy, molecules with more energy start to move around Melting verses freezing

If you move something from one container to another and its volume changes it is a? A. solid b. liquid c. gas

Which of the following is endothermic? A. boiling water b. fog c. snow

Which of the following is exothermic? A. boiling water b. ice cube melting c. water condensing to snow

Phase change that is the opposite of sublimation? A. deposition b. melting c. condensation

During a phase change, the temperature of a substance? A. increases b. decreases c. does not change

Parts of an atom D

Periodic table GroupsPeriods

Periodic Table reactivity Ends are more reactive than the middle- the exception is the last row Valence electrons determines reactivity

Valence Electrons An electron that is in the highest energy level of an atom The number next to A in group matches the valence electrons –or- if # over 10 subtract 10. – For example Oxygen in in group 16 and it has 6 valance electrons 2 numbering methods for table – Groups 1-18 and IA-VIIIA (Representative Group)

Metals good conductors of electric current and heat Solid at room temperature except Mercury – Some are highly reactive and others not so much Ex. Gold and Magnesium

Transition Metals Groups 3 to12 Forms a bridge between elements on left to right of table

Nonmetals poor conductors of heat and electric current Most are gases at room temperature Some are very reactive and some not – Ex. Fluorine is the most reactive

Metalloids Elements with properties that fall between those of metals and nonmetals – Ability to conduct electric current varies with temperature

Which two subatomic particles have about the same mass? A. protons and electrons b. neutrons and electrons c. protons and neutrons

During a phase change, the temperature of a substance? A. increases b. decreases c. does not change

During a phase change, the temperature of a substance? A. increases b. decreases c. does not change

Review sheet answers 1. d 2. a 3. c 4.a 5. d 6. c 7. b 8. c 9.c 10. a 11.c 12.b 13. d 14. c 15. c 16. c 17. c 18. a