Chapter 6, Lesson 8 Chimistry Activity Sheet With Answers

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Chapter 6, Lesson 8 Activity Sheet Answers
1. Since the green solution turned reddish in one cup, there must have been an acid
in that cup. Since the green solution turned purple in the other cup, there must
have been a base in that cup.
2. As the citric acid solution becomes more concentrated, the color of the indicator
solution goes from green to yellow, to orange, and to red.
3. As the concentration of the citric acid increases, the solution becomes more acidic
so the number on the pH scale decreases.
4. As the sodium carbonate solution becomes more concentrated, the color of the
indicator solution goes from green to blue-green, to blue, to purple.
5. As the concentration of sodium carbonate increases, the solution becomes more
basic so the number on the pH increases.
6. The purpose of leaving the first well green is to have a color to compare the other
colors to see how much they changed.
7. When the two water molecules bump into each other, a proton from a hydrogen
atom in one water molecule is attracted to and switches over to the other water
molecule.
Since a proton has a positive charge, the molecule that gained the proton is a
positively charged ion and the water molecule that lost the proton now is a
negatively charged ion.
8.
+
Type of Substance
Concentration of H
O
ions
3
Acid
Increases
Base
Decreases
Neutral
Stays the same
9. As the acid is poured in, the solution goes from green to reddish. As the base is poured
into the acidic solution, the color changes from reddish back toward the neutral green.

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