Which change can be easily be reversed? question 23 options: both a physical and chemical change chemical change physical change neither a physical or chemical change?

What volume of air at 0.98 atm can be compressed into an 11.1 L scuba air tank if the tank is pressurized to 204 atm?

A student tried to dissolve some iodine crystals in water, but found that they could not dissolve. She used alcohol instead and found out that the iodine crystals dissolve readily in alcohol.

What has a higher ionization energy sodium or francium

What is true about exothermic reactions? A. More heat is given off than is put into the reaction. B Energy from an outside source is continuously being added. C. The reaction container always feels cold. D.

Pretend that you are the size of an atom, observing a reaction between a potassium atom and a fluorine atom. Write an account of the formation of an ionic bond as the atoms react.

An exception to this trend occurs in Group 13, and gallium is smaller than aluminum. Justify this exception to the expected periodic trend by invoking the electron configurations of each element.

A population of ground squirrels lives in underground burrows several miles from an ocean shore. If a hurricane strikes the shore, which effect of the hurricane would probably do the most damage to the squirrel population? A. thunder B. lightning C.

Which best explains how heat plays a role in the movement of materials within Earth's interior?

If you start with 10ml of 0.75 m cu (no3) 2 how much cu (s) in grams should be recovered in step #7

Explain why aluminum does not react with potassium nitrate (KNO3) although it reacts with copper nitrate.