Lichens, a combination of fungi and algae, grow on the surface of rocks. They secrete acids that slowly eat away at the surface of the rock. Is this an example of chemical or physical weathering?

physical

chemical

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

Which statement characterizes synthetic polymers? a. they come from animals and plants. b. they are found in nature. c. they are made in a lab. d. they are components of starch.

Magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. trial 1: trial 2: data mass of empty crucible with lid trial 1: 26.688 trial 2: 26.681 mass of mg metal, crucible, and lid trial 1: 26.994 trial: 2 26.985 mass of mgo, crucible, and lid trial 1: 27.188 trial 2: 27.180