In an experiment, hydrochloric acid reacted with different volumes of sodium
thiosulfate in water. A yellow precipitate was formed during the reaction. A cross
drawn at the base of each flask became gradually invisible due the formation of this
yellow precipitate. The time taken for the cross to become invisible was recorded. A
partial record of the experiment is shown.
Experimental Record
7
Flask Volume of Volume of
Volume of Ti
HCI Sodium Thiosulfate Water
1 10 mL 10 mL
40 ml 14 seconds
10 mL 20 mL
30 mL
3 10 mL 30 mL
20 mL
4 10 mL 40 mL
10 mL
mL
Based on your knowledge of factors that affect the rates of chemical reactions,
predict the trend in the last column of the exnerimental record Ilse comnlete

The isotonic saline solution described in part a is connected to an unknown solution via a semipermeable membrane, the unknown solution level drops. based on this information, what can be said about these two solutions?

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

What’s the scientific notation for the number 6,840,000,000