The Body
Electricity
Ecology
Changing Earth
Chemical Reactiosn
200
What is the largest human organ?
The skin
200
What is the unit for resistance?
Ohms
200
What is a food chain?
A food chain is a simple way of displaying the flow of energy through an ecosystem.
200
Convection currents inside the Earth occur where?
The Mantle
200
NaOH + AgNO3 → Na2NO3 + AgHO
Na2NO3
400
What is the difference between a Pandemic and an Epidemic?
An epidemic is a disease outbreak rapidly spreading in a limited region. A pandemic is an epidemic that is actively spreading to multiple regions across the globe.
400
What is the purpose of a fuse?
Used in circuits to prevent the current from getting too high.
400
Name 3 abiotic factors.
Sample solution:
pH, water, wind
400
Continental Drift is what?
Refers to the horizontal movement of tectonic plates due to convection currents.
400
Define a neutralisation reaction and the key terms within your definition.
A reaction between an acid and a base that produces salt and water.
Salt: Metal and non-metal bonded together
Water: Dihydrogen monoxide
Acid: Chemicals that break down in water and water and release hydrogen ions
Base: Chemicals that break down in water and release hydroxide ions
Reaction: Process of the bonds between atoms/compounds breaking and new bonds forming.
600
What are the 1st, 2nd, and 3rd lines of defence within the body?
1st: Physical and chemical barriers, 2nd: non-specific innate responses, 3rd: specific adaptive responses.
600
Define closed circuit.
A closed circuit is a circuit with only one path (or similar answer).
600
What is the equation for capture mark recapture?
Number in first batch x number in second batch
The number marked in the second batch
600
How do volcanoes form?
In two settings where either an oceanic plate descends below another oceanic plate or an oceanic plate descends below a continental plate.
600
K2Cr2O7 + HCl —> KCl + CrCl3 + H2O + Cl2
K2Cr2O7 + 14HCl —> 2KCl + 2CrCl3 + 7H2O + 3Cl2
800
What is the function of a motor nerve and where does it send a message to and from?
Transmit impulses from the spinal cord to skeletal and smooth muscles and send messages between CNS to the Effector.
800
What is the most energy-efficient type of light bulb?
L.E.D. bulbs
800
Draw and annotate the water cycle.
(Look at paper)
800
What is a fault?
A fault is a fracture or zone of fractures between two blocks of rock.
800
Explain an exothermic reaction.
Exothermic reactions release energy in the form of heat to the surrounding environment due the energy required to break the bonds in the reactants being less than the energy released when forming the bonds of the products.
1000
What are the two endocrine glands within the brain?
Pituitary and the Hypothalamus glands.
1000
Where, when (day, month and year), and from what, did the creator of the Ohm, Georg Simon Ohm, die?
Georg Ohm died in Munich, Germany, on July 7th, 1854, from a stroke.
1000
Examine the ecological impact of a top predator’s removal from a complex food web.
Answers will vary.
1000
Can earthquakes be predicted? If so, how?
No. Neither the USGS nor any other scientists have ever predicted a major earthquake. Ways to maybe predict them is by observing seismicity changes, changes in seismic wave speed, and electrical changes.
1000
A sample of bioethanol undergoes complete combustion to produce 81.4 L of carbon at SLC. The density of ethanol is 0.789 g L−1 and M(C2H5OH) = 46.0 g mol−1.
Calculate the volume of ethanol that reacted.
The volume of ethanol that reacted is 105.4 mL.