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Chemistry, 13.07.2019 14:30, mariasoledad1
How are physical and chemical changes similar? a. neither can change the number of atoms of each element that are present b. neither can cause chemical bonds to break c. neither can result in a phase change d. neither can cause a substance to give off heat or light
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Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size
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How are physical and chemical changes similar? a. neither can change the number of atoms of each e...
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