Chemistry, 29.09.2020 07:01 dsawnstevensonp9xhnr
In class, Ricardo rips up a piece of paper. Select the correct reason(s) that this is an example of a physical change.
The paper no longer has smooth edges.
The paper has not produced a gas when torn.
The paper's chemical composition has been changed.
The paper has not changed colors.
The paper is still paper with the same chemical makeup.
Answers: 1
Chemistry, 21.06.2019 23:30, mastershadow2018
Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.
Answers: 2
In class, Ricardo rips up a piece of paper. Select the correct reason(s) that this is an example of...
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