Praxis Physical Science 5485 case studies
Praxis Physical Science 5485 · Put your knowledge to work in context.
Praxis Physical Science: Content Knowledge (5485) is a subject-matter assessment used by states and preparation programs as one piece of the evidence that a candidate is ready to teach physical science at the secondary level. It is typically taken by people completing a physics, chemistry, or broad-field science teacher preparation pathway, and by career-changers who already hold a science degree and are adding certification. The Praxis Physical Science 5485 case studies are 5 cases and about 2,550 words.
1Turbidity Filter Trials and the Limits of a Majority Vote
A team in a school engineering challenge must lower the turbidity of 500 mL of synthetic gray water from about 120 NTU to below 25 NTU. Their filter may cost no more than $8.00 and must pass water at 20 mL/min or faster.
580 words, about 3 min2Cart on a Ramp: Is the Missing Energy Small Enough to Ignore?
A 0.50 kg cart is released from rest at a height of 0.40 m above the bottom of a ramp. A photogate at the bottom records the cart's speed.
516 words, about 3 min3Resonance Data That Do Not Fit the Predicted String
A student investigates standing waves on a 1.50 m string fixed at both ends. The string has a linear mass density of 2.0 g/m and is under 45 N of tension.
528 words, about 3 min4Baking Soda and Acid: Is the Missing Mass Really Incomplete Reaction?
Students add 2.00 g of sodium bicarbonate (NaHCO3, molar mass 84.01 g/mol) to 25.0 mL of 1.00 M hydrochloric acid in an open Erlenmeyer flask. The mixture fizzes, and after five minutes the flask and contents have lost 0.72 g of mass.
450 words, about 2 min5Vinegar Titration: A Decimal Error That Looks Like a Confirmed Label
A student titrates 25.0 mL of white vinegar with 0.100 M NaOH. With phenolphthalein, a persistent pale pink appears after 22.4 mL of NaOH.
476 words, about 2 min