Investigation 1B

1. Investigation 1B

4. Read the meniscus � not the highest wetted point. Read to the nearest 0.25 mL approximately with a 100 mL graduated cylinderRead the meniscus � not the highest wetted point. Read to the nearest 0.25 mL approximately with a 100 mL graduated cylinder

5. Students can use plastic pipettes to make sure they deliver a precise amount of water. Students can use plastic pipettes to make sure they deliver a precise amount of water.

6. Define solution � simple now and more detailed in Chapter 2Define solution � simple now and more detailed in Chapter 2

7. Indirect measurement is when you infer one quantity by measuring another � in this case volume in mL from drops.Indirect measurement is when you infer one quantity by measuring another � in this case volume in mL from drops.

13. The yellow dye is removed easiest and green turns blue after only a few drops of bleach � conclusion is that green dye is combination of blue and yellow � confirm by reading the ingredient label.The yellow dye is removed easiest and green turns blue after only a few drops of bleach � conclusion is that green dye is combination of blue and yellow � confirm by reading the ingredient label.

15. Motivated students might curious as to what molecules are responsible for the colors in food coloring. Motivated students might curious as to what molecules are responsible for the colors in food coloring.

16. Although students are not expected to know what a chemical bond is at this point (this is covered in greater detail in Chapter 7). You may choose to simply point out the loss of connection between the two nitrogens, and explain that a change in molecular structure is the result of a chemical reaction. Although students are not expected to know what a chemical bond is at this point (this is covered in greater detail in Chapter 7). You may choose to simply point out the loss of connection between the two nitrogens, and explain that a change in molecular structure is the result of a chemical reaction.