Four students presented different analogies to describe the formation of an ionic bond. Student A: A tug of war between seven middle school students and a high school student
Student B: A small dog and a big dog tugging at a bone with equal strength
Student C: Two neighbors carpooling to work
Student D: A group of high school students reading from the same book in the library

Which student presented a correct analogy?

A
B
C
D

Different isotopes indicate that an element will have different numbers of

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?