1. electrically charged atom or group of atoms formed by the loss or gain of electrons 2. the union between atoms by the interaction of their electrons in the outermost orbit 3. atoms of elements or compounds interact to form at least one new compound 4. the number of electrons lost or gained to complete an element's outer shell 5. a bond formed by the electrical attraction between two oppositely charged ions Word bank chemical reaction Ionic bond valence Chemical bond ion

What is the partial pressure of ethane, pethane, in the flask?

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

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.