Data Analysis Assessment Questions Flashcards
Standard IV Assessment
Given a student designed experiment, “Will salt affect the boiling point of water?” 3 beakers of water placed on hot plates, water, water + 20g salt, and water + 20g of salt added after it started boiling. Water - 98, water + 20 = 100, and water + late salt 100 but dropped to 98 when the salt was added. Control? Constant? Variables? Errors? 2 concepts a 9th grade student should know.
Control = beaker of only water
Constant = 250ml water
Variables = dependent variable = temperature
Independent variable = 3 beakers with substances
Errors = Water should boil at 100*C, salt addition should allow the water to be hotter before it boils (a cooling process), the graph has no labels or units, the scale shows nothing useful.
Standard II & III KOS & Curriculum and Instruction
Describe a scientific event or discovery and discuss the knowledge necessary to understand the event or discovery. How is another science discipline related to this discovery and how has it affected society.
Joseph John Thompson discovered electrons in 1897. He ran the Cathode Ray Tube experiment (interpreted the reflection of rays from electrically charged plated and magnets) and found that negatively charged subatomic particles (electrons) existed within the atom. He call his atomic model the Plum Pudding Model where the plums (scattered throughout the atom) represented the electrons and the pudding represented the rest of the atomic structure. His research led to mass spectrometry by his assistant Frances Aston which led to the discovery of isotopes which changed everything including weaponry, warfare, and medicine.
Standard II, III, & IV KOS, C and Instruction, Assessment
Evaluate a student’s understanding of science concepts, describe instruction that would help move the student toward the accepted understanding of the concept.
Ques = “What temp scale must be used to calculated Charles Law, why? Express the answer in terms of energy and particle motion”
Student answer = Temp is how hot or cold something is. Hot gases need more space (vol) than cold gases. Use Kelvin to calculate Charles Law because C and F can be negative numbers. We use Kelvin because it is positive all the way down to absolute zero where there is no energy or particle motion.
Charles Law pressure = Vol/Temp You must use Kelvin since zero at Kelvin is absolute zero. Zero on C and F still has values below that point (going into the negatives).
