advanced physical science 1 st semester exam review december ~ 2009
TRANSCRIPT
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Advanced Physical Science1st Semester Exam Review
December ~ 2009
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Know #2: SI units of measurement Mass – grams (g) Volume – milliliters (mL) Density – grams per cubic cm (g/cm³) Distance – meters (m) Speed – meters per second (m/s) Velocity - meters per second South (m/s South) Acceleration – m/s² South Force – Newtons (N)
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#3: Three types of scientific models
Physical Mathematical Conceptual
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#4 Examples of physical properties of matter Solubility State of matter (solid, liquid, gas) Density Ductility Malleability Thermal conductivity Shape, texture, etc. Odor Color Back
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#5 Viscosity and an example
Physical property of a liquid which is its level of resistance to flow
High viscosity – stronger attraction of molecules, flow is slower
Honey has a high viscosity compared to water
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#6: The states of matter…
Solid – Definite shape, definite
volume Liquid – Definite volume, no definite
shape Gas – No definite shape or volume Plasma – (gas) No definite shape of
volume
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#6 Continued – Changes of State
Liquid to gas – evaporation Gas to liquid – condensation Solid to liquid – melting (endothermic) Liquid to solid – freezing (exothermic) Sublimation – solid to gas
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#7: What sublimation is
Solid becoming a gas without going through the liquid state.
Example – Dry Ice
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# 8: Properties of metals…
Hard Shinny Malleable – can be pounded, pressed Ductile – can be pulled into wire Good conductors of heat
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#9: Properties of non-metals…
Dull Not malleable/ductile Poor conductors
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#10: The parts of an atom and their charges
Protons – positive, in nucleus Neutrons – no charge, in nucleus Electrons – negative charge, move in all
directions at various levels around the nucleus
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#11: How the periodic table is arranged…
By increasing atomic number from left to right
Family / groups in columns Periods in horizontal rows
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#13: Reference point…
Place or object used for comparison to determine if something is in motion
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#14: Balanced, unbalanced forces and net force
Balanced – forces acting on an object are equal; no movement/ motion
Unbalanced – forces acting on an object are not equal; results in motion
Net force – Combination of all forces acting on an object
Force can be a push or a pull
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#15: Examples of Acceleration and what would not be an example Speeding up – or slowing down Changing direction Spinning around Orbiting
NOT Examples: Going in one direction at a steady rate Not moving at all
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Understand 1: The Scientific Method
Ask question or state problem Gather info Form a hypothesis Test the hypothesis Observe Analyze Draw a conclusion
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Scientific Method, continued
Independent variable – The one you’re testing; the one that’s changing
Dependent variable – the one that changes as a result of the experiment; what you’re measuring.
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#2: The difference between scientific law and theory
Scientific Theory - Explains / an explanation based on hypothesis and observations
Scientific Law – Summarizes/ a summary of many results; Will predict or tell what will happen every time.
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#4: Examples of chemical properties and what they mean
Flammability – ability to burn Reactivity– Ability to chemically combine
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#5: The difference between a physical and chemical property
Physical property – can be observed or measured without changing identity
See slide #4 under “Know” Chemical property – ability to change
into a new substance
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# 6: Difference between mass and weight
Mass is the amount of matter in an object
Weight is the measure of gravitational force on an object
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#7: The particles in solids, liquids and gases
In solids they vibrate in place ( strong attractions of particles)
Liquids – Are close but slide past one another
Gases – Move apart independently and randomly
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#8: The difference between compounds and mixtures
Compounds – a chemical combination of elements
Mixtures – combination of 2+ substances not chemically combined
Compound examples – H2O, CO2
Mixture examples – dirt, pizza, salad, blood, oil & vinegar
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#9: Difference between elements and compounds
Elements are pure substances that can’t be broken down by physical or chemical means (particle – atom)
Compounds are pure substances made of 2+ elements combined chemically (particle – molecule)
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Difference between solvent and solute
The solvent is the substance in which the solute is dissolved.
Salt water- Water is the solvent, salt is the solute
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# 11: Difference between metals, non-metals and metalloids
Metals are shiny, malleable, ductile and good conductors of heat
Non-metals are dull and poor conductors Metalloids are semi-conductors;
properties of both
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#12: Difference between mass number and atomic number
Atomic number is the # of protons in an atom
Mass number is the sum of protons and neutrons
Atomic mass is how much mass is contained in all the particles of an atom. On the Periodic Table it is the average mass of the isotopes.
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# 13: Motion vs. Speed
Motion is an object’s change of position relative to a reference point
Speed is the distance traveled over the time it takes to get there; D/T
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#14: Speed vs. Velocity
Speed is D/T (m/s) Velocity is D/T in a certain direction -
North, South, East, West (m/s East) When you know speed and direction,
you can determine velocity Acceleration is the change in velocity
over time (m/s² South) V2 – V1
T2 - T1
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#15: Static vs. Kinetic friction
Static friction – friction that does not allow movement
Kinetic friction – friction that allows movement
Static – Trying to move a ton of concrete blocks
Kinetic – Sliding a book
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#1 Be able to…
A pure substance is the smallest sample of matter where there is only one type of particle (an atom or molecule). Elements and compounds are both considered the smallest samples of matter. A single element or a single compound (elements combined chemically) have definite physical and chemical properties.
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#4: Be able to….
Compounds are the chemically combined atoms of elements whose smallest particle is a molecule
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#5: Be able to…
By spinning around, orbiting or changing direction
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#6 & 7: Be able to…
Exothermic – heat out. For example, freezing
Endothermic – heat in. For example, melting
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#8: Be able to calculate…
Density – M/V – 1st you have to calculate volume – L x W x H (or by water displacement cm³), then divide mass by your answer
Speed – D/T Acceleration – V2 – V1
T2 - T1
Net Force
5 N East and 8 N West
Net Force = 3 N West