Answers: 3
Chemistry, 22.06.2019 08:30
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
Answers: 1
Chemistry, 22.06.2019 12:00
An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?
Answers: 1
Chemistry, 23.06.2019 17:10
Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.
Answers: 1
Chemistry, 23.06.2019 21:00
Awheelchair ramp needs to be pitched at 8 degrees. if the ramp is to access an 18-inch step to a door what will be the length of the ramp to the nearest inch?
Answers: 1
Metal ions are typically their corresponding...
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