Classify each of the observed changes according to whether or not they are likely to represent evidence that a chemical
reaction is occurring when performing an experiment.

May be evidence of a chemical reaction

Not evidence of a chemical reaction

Answer Bank
a solid liquifying
precipitation
change in temperature
solution colors mixing
a solution color becoming less intense due to dilution
bubbles (gas formation)
changes in color
explosion or fire

Dwayne filled a small balloon with air at 298.5 k. he put the balloon into a bucket of water, and the water level in the bucket increased by 0.54 liter. if dwayne puts the balloon into a bucket of ice water at 273.15 k and waits for the air inside the balloon come to the same temperature, what will the volume of the balloon be? assume the pressure inside the balloon doesn’t change. type the correct answer in the box. express your answer to the correct number of significant figures. the volume of the balloon at 273.15 k is liters.

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

Drug abuse will not lead to physical and psychological dependence. true or false ?