Chemistry
Biology
Physics
100
Al2O3 + H2SO4 --> Al2(SO4)3 + H2O
Balance the following chemical reaction.
Al2O3 + 3H2SO4 --> Al2(SO4)3 + 3H2O
100
Where does cellular respiration occur?
mitochondria
100
Which of the following is not an SI unit?
- Celcius (C)
- Mole
- Pascal
- Ampere
- Hertz
A. Celcius
200
How many "phosphate ions" are in a sample of
Ca_8H_2(PO_4)_6*5H_2O
that contains 5.50*10-3 grams of oxygen?
4.28*1019 phosphate ions
200
What are the 4 phases of mitosis?
prophase, metaphase, anaphase, telophase
200
A car of mass m descending a slope. The car, initially at rest, covers a distance of 27m in 3s
S = ut + 1/2at^2
2*27/3^2 = 6 ms^-2
300
Calculate the total pressure.
PV=P1V1+P2V2+P3V3=20.302
V=V1+V2+V3=4+1.5+3.5=9L
P=20.302/9=2.26 atm
300
What is osmosis?
water moves across the partially permeable membrane
300
A small object is fired horizontally at a speed of 300ms^-1 from the top of a building. Air resistance is negligible. The object lands 900 m from the base of the building. What is the height of the building?
900/300 = 3s
S = ut + 1/2at^2
S = 44m or 45m (when using g=10)
400
If we start with 50g of ice at -10 celcius and heat it until it forms steam at a temperature of 110 C, how much energy would be needed?
c of ice=2.03 J/gc
c of water 4.18J/gc
c of steam=1.99 J/gc
heat of fusion= 334J/g
heat of vaporization= 2259J/g
-10 --> 0: 1,015J ice --> water:16,700J
0-->100: 20,900J water --> steam: 112,950
100 --> 110: 9,95J
Energy Needed= 152,560J
400
What does ATP stand for?
adenosine triphosphate
400
A ball is released from rest and falls vertically for 3 seconds on Earth. Air resistance is negligible. What is the average speed of the ball during the motion?
V = u + at = 0 + 10*3 = 30
V(average) = (v + u)/2 = (30 + 0)/2 = 15
500
A balloon that is 100.21 L at 21 °C and 0.981 atm is released and just barely clears the top of Mount Crumpet in British Columbia. If the final volume of the balloon is 144.53 L at a temperature of 5.24 °C, what is the pressure experienced by the balloon as it clears Mount Crumpet?
0.644 atm
PV=nRT
n=(PV)/(nRT)
500
What are the 4 groups of organic molecules
carboydrates, lipids, nucleic acids and proteins
500
A box of mass 2kg is pushed with an initial speed of 10ms on a rough horizontal floor. A uniform frictional force of 10N acts on the box. What is the distance travelled by the box at the instant when the kinetic energy of the box is halved?
5m
E = W = F*d
E = 1/2mv^2
(2*10^2)/2 - (2*10^2)/4 = 10d
D = 5m