An unknown substance is transferred into a beaker filled with 100 mL of water, and the unknown sinks. Which of the following conclusions can be drawn from the information given?

Which method might be used for separating a mixture of alcohol (a liquid) and water?

Which of the following statements about density is TRUE?

Which of the following statements is TRUE? 1.   and  have the same number of neutrons. 2.  and are isotopes of one another because they have the same mass number. 3. 

Rubidium (Rb), is likely to form what kind of ion?

Which of the following statements about atomic structure is FALSE?

Which one the following statements concerning matter is correct?

What is the molar mass of ammonium carbonate [(NH4)2CO3]?

The atomic mass listed for an element on the periodic table is_________.

Which of the following statements about chemical reactions is FALSE?