Physical science: Mass of a Gas Lab

In a _______ system, nothing can leave the reaction container.

• physical

• closed

• open

• chemical

How full of water should the vial be?

• exactly 45 mL of water

• Completely full

• 20 drops of water.  No more, no less

• About 1/3 full

How will you know when the reaction is completed?

• It will take exactly 5 minutes.

• It stops fizzing.

• When the color stops changing.

• When it reaches 30^o C.

What are you graphing on the histogram?

• The change in temperature relative to the size of the alka-seltzer

• The change in mass relative to the size of the alka-seltzer

• The number of groups that have certain changes in mass.

• The size of the alka-seltzer relative to the mass of gas produced.