ChemistryWiki | RecentChanges | Preferences
1. 25.1 m/s
2. Conduction is heat flow through a continuous piece of matter (ie. metal frying pan).
Convection is heat flow through air or water. (ie. turkey cooking in an oven).
radiation does not need particle to move, it is simply energy in motion (not really good one).
3. Temperature is the average kinetic energy (KE) of all the particles in a substance. Temperature is not heat (which is simply a form of energy) since you can have two substance with the same temperature but have different amounts of heat (ie a glass of water and Duxbury Bay water can both be at 20deg C and they do not have amount of energy).
4. 2.4E5cm2
5. 17.55g
6. Yes, since it all known digits plus one guess (which means you are guessing in between smallest markings).
7. Precision is the reproducibility of measuring device and accuracy deals with how close you come to a desired outcome. Significant figures are the method that scientist use to make sure their measurements are both accurate and precise since quantitative measurement show both the actual value and the type of measurement equipment (what are the marking on the device is) used.
8. Controlled experiment require only one variable to change at a time. In this way, one can make a direct correlation between that one variable and outcome you are looking at.
9. Properties of cpd/mixture compared to material that makes it up, Proportions, and separation techniques. Suspension is a heterogeneous mixture (will settle out like muddy water) whereas colloid another heterogeneous mixture does not settle out.
10. You are burning wood in the fireplace. You can feel the energy change, see the different mass/sizes of the logs (physical extensive), and when you lifted the log into the fire, you can experience the density (physical intensive) difference of the different wood.