Chemistry
Biology
Physics
100

Al2O3 + H2SO4 --> Al2(SO4)3 + H2O

Balance the following chemical reaction.

Al2O3 + 3H2SO4 --> Al2(SO4)3 + 3H2O

100


  1. Where does cellular respiration occur?


mitochondria

100

Which of the following is not an SI unit?

  1. Celcius (C)
  2. Mole
  3. Pascal
  4. Ampere
  5. 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