Midterm Review- Whiteboards Chemistry and Scientific Basics Review Lake Dallas Middle School 2012

Chemistry Which subatomic particle is positive? Protons Which subatomic particle is negative? Electrons Which subatomic particle is neutral – no charge? Neutrons

Chemistry Which subatomic particles are in the nucleus of an atom? Protons and Neutrons Which subatomic particle is the “identity” of an atom? Protons Which subatomic particle is the “glue” that holds the nucleus together? Neutrons

Chemistry Which subatomic particle has a mass of almost zero? Electrons Which two subatomic particles have a mass of 1amu? Protons and Neutrons Which subatomic particle is the same as the atomic number? Protons

Chemistry What are located on outmost energy level? Valence electrons What tells you the number of valence electrons? Group # How many valence electrons does Fluorine have? 7

Chemistry Is Sulfur a metal, metalloid, or nonmetal? Nonmetal Find the P.E.N. for Oxygen P=8, E=8, N=8 Which period is Sodium in? 3 Which element has 18 protons? Argon (Ar)

Which have more in common? Group/periods Groups Which direction do periods go on the periodic table? Horizontally Why do we balance equations? Law of conservation of Matter/Mass

Chemistry What is the simplest form of a substance? Element Which group is nonreactive? 18 – Noble Gases Which group is most reactive? 1-alkali metals

Scientific Basics What variable do we measure in an experiment? Dependent Which axis is are Independent Variables graphed on? X-axis What tool would you use to add a small amount of a liquid to a beaker? Dropper

What tool would you use to heat up a substance during a lab? Bunsen Burner What is the basic unit of measurement for mass? Gram What are the states of matter? Solid, liquid, gas

Scientific Basics What should you wear while working with dangerous chemicals, and fire? Goggles, gloves, apron What tool do we use to measure the volume of a substance? Graduated Cylinder What do we use to hold small specimens? Petri dish

Scientific Basics This created a new substance with new properties? Chemical change Is water boiling a chemical or physical change? Physical – state of matter Is a bike rusting due to rain a physical or chemical change? Chemical – reactivity- new substance

Scientific Basics What is the ability to be drawn into a wire? Ductility What is the ability to burn? Flammability What is the ability to be pounded into thin sheets? Malleability What is the ability to be transfer thermal energy? Conductivity

Scientific Basics What is the eyewash used for? If you get chemicals or a unknown substance in your eyes Is baking a cake a physical or chemical change? Chemical – new substance What is the variable that the scientist controls during an experiment called? Independent