Is coffee a pure substance or a mixture?

A weather balloon has a volume of 55 L at sea level. After a balloon is released is rises to where the air pressure is 0.85 atm. What will the new volume of the weather balloon be? Will the balloon appear to have expanded or shrunk, why or why not?

7. The correct chemical symbol for magnesium is ... Mg mg MG mG 8. The smallest part of an element is called ... A mixture A molecule An atom An ion 9. When two elements combine, the name of the compound will usually end in ...

Consider the titration of 30.0 mL of 0.050 M NH3 with 0.025 M. HCl. Calculate the PH after the following volumes of titrant have been added 0 ml 20 mL 59.1 mL 60.0 mL 71.4 mL 73.4 mL

What compotent of air is least nessasery for life on earth

A glass object receives a positive charge by rubbing it with a silk cloth. in the rubbing process, have protons been added to the object or have electrons been removed from it?

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?