Coordinated Sciences (0654)

*UPDATE: a lot of the questions from my correction doc (see link below) came up in the paper today such as a.c. generator, eutrophication, definition of frequency and negative feedback!! (May/June 2016 Paper 32) Some past paper MCQs came up as well so make sure to practice lots of those.

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Link to correction doc/some questions from past papers!! good for some last-minute quizzing with friends..I originally organized this doc for my own mistake corrections from past papers, they were either tricky questions or definition questions that I needed to memorize.

Glossary Terms (Physics, Chemistry and Biology)

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Things to remember/for last minute reminders:

• READ THE QUESTION AND USE THE INFO PROVIDED, NOT THE NUMBERS USED BEFORE
• acceleration: change in speed over time
• ultrasound: above 20000 Hz
• sound/ultrasound waves: longitudinal; EM waves: transverse
• don’t rely completely on your general knowledge, use the info provided to infer from question as well
• state the obvious
• state formula even if the answer was the same as the previous question
• energy = mass x shc x change in temperature
• be specific
• lacteal: absorb fatty acids and glycerols
• no need to add state symbols if question states “construct a balanced symbolic equation”
• alkanes: only single bond/saturated/contain the greatest possible number of hydrogen atoms
• use Ns instead of x
• Vp/Vs=Np/Ns
• temperature activates enzymes
• more male born than females: X sperm swims slower
• endothermic: temperature decreases, heat is absorbed; exothermic: temperature increases, heat is released
• shiny surfaces: worst absorber/emitter, reflect heat
• anaerobic respiration:
  • human: glucose —> lactic acid
  • Plant: yeast: glucose —> carbon dioxide + ethanol + (energy)
• for data questions/situation questions, make full use of the info provided
• state both sides, even when the situation is self-explanatory and clearly opposite
• only radiation can travel through vacuum
• ciliary muscle relax/contract, suspensory ligament slack/tight
• ciliary muscle contract at night for objects up close
• addition polymerization: alkanes
• condensation polymerization: molecules join and lose small molecules e.g. water
• protein is condensation polymerization
• poor absorber = poor emitter of infrared WHITE
• transverse – wave motion is at right angles to disturbance of medium
• longitudinal – wave motion is in the same direction as disturbances of medium
• food web – arrow point in the direction of energy flow e.g. start from producer
• mention start and finish figure or high and low in data questions
• cell voltage is related to relative metal reactivity. the greater the difference in reactivity, the greater the voltage/the reactivity difference between Cu and Zn is greater than between Cu and Sn
• A solute is the substance to be dissolved (sugar). The solvent is the one doing the dissolving (water)
• Solid copper CAN conduct electricity
• number of electron shells = period number
• LOOK OUT FOR UNITS
• circuit breakers cut electricity to a device if too much current flows
• XX female, XY male
• arrangement of ionic compound – lattice, draw square with positive and negative ions alternating
• decomposers are important in the ecosystem because they RECYCLE nutrients
• chlorination: kills microorganisms/prevents water-borne diseases
• when coil is horizontal to the magnetic field/field lines, it induces maximum voltage
• graph of voltage against time for coil in a.c. generator: sine curve
• particles: chances of collisions, frequent collisions, kinetic energy
• approximate range of frequencies audible to humans: 20Hz ~ 20000Hz
• parallel circuits: voltage is the same on each branch, if two of the same component on one branch, one component is half the voltage. current on each branch is NOT the same
• state the number of moles
• focal point = principal focus
• haber process conditions: 200 atm, 450˚C and iron catalyst
• state “area under graph” when solving for distance on a speed/time graph
• remember displacement reactions!!
• USE FIGURES WHEN GIVEN A GRAPH
• 3 s.f. or 2 decimal places
• to find change in kinetic energy, subtract initial from final KE
• bromine is brown in room temp, iodine is dark grey/black
• form of energy means chemical/thermal/electrical etc.
• use comparable words
• force of collisions exert a pressure in walls
• pressure is inversely proportional to volume