Chemistry, 27.06.2019 08:00, thomascoop85
Which answer below correctly identifies the type of change and the explanation when magnesium comes into contact with hydrochloric acid? physical change because no color change occurred physical change because the observation of a gas forming is evidence of a state change, which is reversible chemical change because a temperature change occurred, a solid disappeared, and a gas was produced chemical change because two substances were mixed, which always results in the formation of a new substance
Answers: 1
Chemistry, 21.06.2019 20:30, nmadrigal
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
Answers: 2
Chemistry, 22.06.2019 11:00, Usman458
The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?
Answers: 1
Which answer below correctly identifies the type of change and the explanation when magnesium comes...
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