Transcript Warm-ups:
Warm-ups: Safety Review and Scientific Method Monday, August 27, 2012 Pick two of the safety rules and state why they are necessary. • • • • • • • • • • No eating or drinking in the lab Read all directions thoroughly Be careful in the lab- no messing around Keep lab area neat Return all supplies Do not taste, touch, or smell any substances UNLESS told to do so When smelling, wave hand over substance Tell teacher of all accidents No binders in the lab Clean up area- area must be checked by an adult Tuesday, August 28, 2012 • Read the following lab scenario. Describe what is dangerous in the scenario and what the students should have have done to be safe. As usual, Stephen and Janet were late to class and all the other students were already in the lab. “What are we supposed to do?’’ asked Janet. “I don’t know,’’ replied Stephen. “Let’s just do what everyone else is doing!’’ Wednesday, August 29, 2012 A group of students were preparing an activity to determine whether certain materials will float or sink when placed in water. Before the experiment started, one student said, “If a sponge is placed in water, then the sponge will float.” This statement is a……….. F a conclusion G a fact H an observation J a prediction/hypothesis Wednesday, August 29, 2012 A group of students were preparing an activity to determine whether certain materials will float or sink when placed in water. Before the experiment started, one student said, “If a sponge is placed in water, then the sponge will float.” This statement is a……….. J a prediction/hypothesis A hypothesis is an educated guess based upon background knowledge. It is always written as an if…, then statement with no personal pronouns. Thursday, August 30, 2012 • A student thinks that orange juice will freeze faster than any other substance. She fills identical containers with the same amount of different liquids, then places each in the freezer. She checks them every five minutes and discovers that the orange juice is the last one to freeze and the water is the first to freeze. Which should the student do next? A Change her results to match her original hypothesis. B Repeat her investigation to see if her results are the same. C Conclude that investigations can only be performed on water. D Tell her friends that investigations at school work better than at home. Thursday, August 30, 2012 • A student thinks that orange juice will freeze faster than any other substance. She fills identical containers with the same amount of different liquids, then places each in the freezer. She checks them every five minutes and discovers that the orange juice is the last one to freeze and the water is the first to freeze. Which should the student do next? B Repeat her investigation to see if her results are the same. The more trials that are done, the better the data collected. Eliminates human error. Friday, August 31, 2012 In an experiment, Jackson tested to see how the size of rocks affects the amount of dirt that washes away when water flows downhill. Which variable was manipulated? F G H J Amount of water Slope of the hill Size of the rocks Type of dirt Transitional Page Friday, August 31, 2012 In an experiment, Jackson tested to see how the size of rocks affects the amount of dirt that washes away when water flows downhill. Which variable was manipulated? H Size of the rocks Manipulated (Independent) variable is what is being changed or tested in the lab Transitional Page Tuesday, September 4, 2012 Sandy is conducting an investigation to find out which food his dog likes best. Which is the manipulated variable in his investigation? F The color of his dog’s food dish G The kind of food he gives his dog H The amount of food he gives his dog J The time of day he feeds his dog Tuesday, September 4, 2012 Sandy is conducting an investigation to find out which food his dog likes best. Which is the manipulated variable in his investigation? G The kind of food he gives his dog Manipulated Variable – What is tested or changed in the experiment. Can only have 1 variable in an experiment Wednesday, September 5, 2012 To find out which soil absorbs (holds) moisture best, each container shown must — A be made of a different material B have soil from the same place C be tested by the same person Transitional Page D contain the same amount of soil Wednesday, September 5, 2012 To find out which soil absorbs (holds) moisture best, each container shown must — AA be made of a different material The variable being changed is the manipulated variable. Transitional Page Thursday, September 6, 2012 A student set up an experiment to test how much bean plants will grow in soil with salt in it. The student grew 50 plants in one group and 50 plants in the other group. The only thing that can be different in the two groups is the amount of — F soil in each plant pot G water given to each plant H salt in the soil in each plant pot J fertilizer given to each plant Thursday, September 6, 2012 A student set up an experiment to test how much bean plants will grow in soil with salt in it. The student grew 50 plants in one group and 50 plants in the other group. The only thing that can be different in the two groups is the amount of — H salt in the soil in each plant pot What would need to be controlled in this experiment? List at least four different controls. Backdrops: www.animationfactory.com - These are full sized backdrops, just scale them up! - Can be Copy-Pasted out of Templates for use anywhere!