In the first 10 seconds of the "Part 1" video there are two substances in two different test tubes. Name two physical properties of one substance in the first sentence of your answer. Name two phyical properties of the other substance in the second sentence of your answer.
When one substance was added to the other substance, was there a physical change or chemical change?
What evidence leads you to believe that it is a physical change or chemical change?
Was the system in the video an open system or closed system and why do you think that?
Rewatch the video and record the mass of the two substances, test tubes, and beaker at the beginning of the video and then record the mass of the substance(s), test tubes, and beaker at the end of the video. Did the mass increase, decrease, or stay the same?
Why do you think that happened to the mass?
Draw a "before mixing" particle diagram and an "after mixing" particle diagram.
When one substance was added to the other substance, was there a physical change or chemical change?
Was the system in the video an open system or closed system and why do you think that?
Rewatch the video and record the mass of the two substances, beaker, and dropper bottle at the beginning of the video and then record the mass of the substance(s), beaker, and dropper bottle at the end of the video. Did the mass increase, decrease, or stay the same?
Why do you think that happened to the mass?
Draw a before mixing particle diagram and an after mixing particle diagram.
When one substance was added to the other substance, was there a physical change or chemical change in "Part 3" video?
What evidence leads you to believe that it is a physical change or chemical change?
Was the system in the video an open system or closed system and why do you think that?
Rewatch the video and record the mass of the two substances, test tubes, and beaker at the beginning of the video and then record the mass of the substance(s), test tubes, and beaker at the end of the video. Did the mass increase, decrease, or stay the same?
Why do you think that happened to the mass?
Draw a before mixing particle diagram and an after mixing particle diagram.
State the law of conservation of mass.