12. Identify the following as a chemical or physical change: Chemical
a. Burning paper
b. Forming new compounds
C. Baking a cake
d. Acid rain reacting with rocks
e. Change in size
f. Change in color Chemical
8. Slicing bread
h. Change in size but not the substance
1. Producing heat
Water rushing over rocks
k. Tearing paper

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

Which of the following would not diffuse through the plasma membrane by means of simple diffusion? 1 oxygen 2 glucose 3 a steroid hormone 4 a lipid soluble vitamin

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.