Question 1

1. atomic number, neutron, isotopes
2. 92 36 Kr
3. 18.5 minutes
4. (1.26 x 10^11) / (82000 x 10^6) = 1.54g
5. It allows for different skills and ways of thinking to come together and understand science better.

Question 2

1. melting freezing, condensing
2. evaporation and boiling both change liquid to gas. boiling increases overall energy of all the particles but evaporation only increases temperature of surface and therefore cooling occurs to the liquid.
3. cooking oil, ethanol
4. 20.8
5. Ethanol requires the least amount of heat energy because it has the greatest cooling effect. Since oil has no cooling effect, that means that for evaporation to occur, it needs more energy. Therefore Student B is correct.

Question 3

1. Moons are solid, stars emit their own light unlike moons
2. The moons orbited Jupiter and not the Earth. Therefore the geocentric model is incorrect because if it was true then the moons would be orbiting the earth.
3. Because then there is a possibility than life can thrive there
4. can travel through a vacuum at the speed of light, transverse waves

Question 4

1. sound
2. How does the mass lifted by a pulley affect the efficiency of the motor?