During a demonstration, a teacher mixed vinegar (an acid) with baking soda (a base). Lots of bubbles formed. The vinegar was gone when the bubbling stopped. The liquid that remained was a solution of a new substance in water. What was the teacher most likely demonstrating? A a physical change B the process of baking C a chemical reaction D the strength of acids

1) sections 1, 2, and 10 are significant primarily because they suggest the likelihood that a) widow wycherly is actually the woman in the full-length portrait. b) dr. heidegger wants to include his guests in an experiment with the water. c) dr. heidegger plans to drink some of the water from the vase and needs witnesses. d) the guests will be asked to witness dr. heidegger's transformation when he drinks the water.

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor