Biology
The most abundant gas in the Earth's atmosphere?
What is Nitrogen?
The number of electrons in a p-orbital
What is 6 electrons
A diver climbs some steps to a diving board. Which two of the statements P, Q, R, S and T are true?
P: as the diver falls, gravitational potential energy is transferred to kinetic energy
Q: as the diver falls, kinetic energy is transferred to gravitational potential energy
R: the gravitational potential energy of the diver on the board is equal to the energy transferred to the diver when climbing the steps
S: the kinetic energy of the diver on the board is equal to the energy transferred to the diver when climbing the steps
T: when the diver hits the water, all the gravitational potential energy is regained
P and R
The name of the biggest part of the human brain
What is the Cerebrum?
During photosynthesis
A. light reactions produce sugar, while the Calvin cycle produces O2.
B. light reactions produce NADPH and ATP, while the Calvin cycle produces sugar.
C. light reactions photophosphorylate ADP, while the Calvin cycle produces ATP.
D. the Calvin cycle produces both sugar and O2.
The correct choice is B
Light reactions, which convert solar energy into chemical energy (ATP, NADPH) in the thylakoid membranes, fuel the Calvin cycle’s production of sugars in the stroma.
The term "renal" refers to this organ
What are the kidneys?
LeChatelier’s Principle
If a stress is introduced to a system at equilibrium, the system will shift to counter that change
The devices listed below transfer electrical energy in different ways.
Lamp, Drill, Clothing Iron, Electric Bell
What are the useful form of energy the devices are deisigned to produce.
Lamp- Light
Drill- Movement (kinetic energy)
Iron- Heat (thermal energy)
Bell-Sound
Label the following as "renewable" or "fossil" fuels...
a) gas;
b) coal;
c) straw;
d) water;
e) petroleum;
f) wood.
a) fossil;
b) fossil;
c) renewable;
d) renewable;
e) fossil;
f) renewable.
Organisms that reproduce sexually exhibit zygotic, gametic, or sporic meiosis. One way to determine the type of life cycle an organism has is by
A. observing embryonic development.
B. comparing the diploid and haploid forms of the organism.
C. determining when in the life cycle fertilization occurs.
D. determining if gametes are multicellular or unicellular.
The correct choice is B
Life cycles are characterized by the timing of meiosis and the characteristics of the diploid and haploid generations.
Embryonic development, (A), does not reveal either of these characteristics, nor does fertilization, (C). All gametes are unicellular, ruling out (D).
Give the main survival advantage of each of the following adaptations:
a) A polar bear's white coat;
b) A hedgehog's spikes;
c) A cheetah's bendy spine;
d) An eagle's sharp claws;
e) A lion's powerful teeth.
a) Camouflaged body so its prey doesn't see it creeping up in the snow;
b) Protection from predators;
c) Flexibility allows the cheetah to reach its maximum speed quickly and smoothly;
d) So it can dive down and grab its prey quickly and not drop it;
e) So it can tear and grind meat easily.
In the following reaction, which substance is being reduced:
Zn + H+ ⟶ Zn2++ H2
What is Hydrogen
Energy travels from the Sun the Earth by ............1............... In a kettle hot water rises by...............2............. Thermal energy passes through the walls of a room by ..............3........... To reduce heat loss from a house, the cavity walls are fitted with ...........4...............
1 Radiation
2 Convection
3 Conduction
4 Insulation
Name the 4 main parts of a transverse wave
Wavelength
crest
trough
amplitude
Which of the following reactions is most likely to have both a positive ΔH and ΔS?
A. heat + NH4Cl (s) → NH3 (g) + HCl (g)
B. 2SO2 (g) + O2 (g) → 2SO3 (g) + heat
C. heat + H2 (g) + CO2 (g) → H2O(g) + CO(g)
D. 2NO (g) → N2 (g) + O2 (g) + heat
Correct Answer: A
Endothermic reactions have the heat on the left side and a positive ΔH. Reactions with an increase in entropy also have a positive ΔS. Because the reaction in choice (A) produces two moles of gas for each mole of solid, it would have a positive ΔS.
Read the following passages and then identify the type of drug they are referring to...
a) Activity of the nervous system is reduced. Responses slow you down and you become sleepy.
b) Provide a feeling of sleepiness and calm when first taken. Motivation decreases and your body deteriorates both mentally and physically.
c) Increases activity of the nervous system. Raises alertness, emotions or mood.
d) A feeling of endless energy and universal love soon develops into a danger of overheating, dehydration and collapse
What are
a) Depressants;
b) Pain killers;
c) Stimulants;
d) Hallucinogens.
Calculate the percentage by mass of aluminium in aluminium oxide
52.9%
A wire passing down through a hole in a card. If iron filings are sprinkled on the card they form a circular pattern as soon as the current in the wire is switched on.
a) Why does this happen?
b) Give two ways that you can increase this electromagnetic effect.
c) What is the main energy change in the motor?
d) The motor is not 100% efficient. What happens to the wasted energy?
e) Explain why the motor turns
a) The flowing current produces a magnetic field. The iron filings are affected by the magnetic field.
b) Increase the current. Have more coils. Put an iron core inside the coil.
c) Electrical energy to Kinetic energy.
d) Heat energy.
e) The magnetic fields of the wire and of the magnets do not want to be in the same place so they interact. This pushes them apart. The coiled wire is free to move so it starts to turn.
Ultrasound can be used to detect shoals of fish, it can be called sonar A pulse of ultrasound is sent out from a boat an echo is heard 0.3 seconds later.
a) What is an echo?
b) The speed of ultrasound in water is 1500 m/s. Why does ultrasound (and sound) travel faster in water than in air?
c) Calculate the depth of the shoal of fish.
a) An echo is wave a sound wave reflects off something
b) The particles in a liquid are closer allowing better interaction between particles in the longitudinal wave.
c) Speed = distance / time.
Distance = speed x time.
Distance = 1500 x 0.3 = 450 m
Half this to get depth.
Depth = 225 m.
Given the following standard reduction potentials, which reaction would be expected to occur?
Cu+ + e− → Cu (s) E° = +0.52 V
2H+ + 2e− → H2 (g) E° = 0 V
Pb2+ + 2e− → Pb (s) E° = −0.13 V
Cr3+ + e− → Cr2+ E° = −0.41 V
A. 2Cu (s) + Pb2+ → 2Cu+ + Pb (s)
B. Pb2+ + H2 (g) → Pb (s) + 2H+
C. 2Cr2+ + Pb2+ → Pb (s) + 2Cr3+
D. Pb (s) + 2Cr3+ → 2Cr2+ + Pb2+
Correct Answer: C
The 5 main areas in which invaders try to enter our bodies
What are the Skin; Eye; Respiratory system; Reproductive system; Digestive system
This quantum number indicated the orientation of the region in space
What is the magnetic quantum number
What are the missing parts of the electromagnetic spectrum between radio waves and gamma rays.
microwave
infrared
visible light
ultra violet light
x ray
Complete the following equations:
a) calcium carbonate + nitric acid =
b) sodium carbonate + sulphuric acid =
c) Ethanoic acid + sodium hydroxide =
a) = calcium nitrate + carbon dioxide + water
b) = sodium sulphate + water + carbon dioxide
c) = sodium ethanoate + water
Under the influence of a force, an object of mass 4 kg accelerates from 3 m/s to 6 m/s in 8 s. How much work was done on the object during this time?
A. 27 J
B. 54 J
C. 72 J
D. 96 J
Correct answer B