Section 1 - Question 6 The diagram is an illustration of a common substance found in the atmosphere,
is the substance an atom or a molecule?
A
It is an atom because it has a nucleus,
B
It is an atom because C and O are subatomic particles
с
It is a molecule because it is held together by energy and not chemical bonds.

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

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

Light waves travel than sound waves.