Meat tenderizer contains an enzyme that interacts with meat. If meat is coated with tenderizer and then placed in a refrigerator for a short time, how would the enzyme be affected? (1) It would be broken down. (2) Its activity would slow down. (3) Its shape would change. (4) It would no longer act as an enzyme.
Which statement concerning proteins is not correct? (1) Proteins are long, usually folded, chains. (2) The shape of a protein molecule determines its function. (3) Proteins can be broken down and used for energy. (4) Proteins are bonded together, resulting in simple sugars
Acids • Produce H+ ions • Taste sour • Change blue litmus to red • Has a pH less than 7 • React with base to form salt and water • Neutralization reaction
Bases • Produces OH- ions • Taste bitter • Change red litmus blue • Has a pH higher than 7 • React with acid to form salt and water • neutralization
pH scale • Power of hydrogen
Measuring pH • Indicators:dyes that will change colors in the presence of acids or bases • Some indicators only work in a specific pH range
Neutralization • Acid + Base salt + water • HCl + NaOH NaCl + HOH
A certain plant has white flower petals and it usually grows in soil that is slightly basic. Sometimes the plant produces flowers with red petals. A company that sells the plant wants to know if soil pH affects the color of the petals in this plant. Design a controlled experiment to determine if soil pH affects petal color. In your experimental design be sure to: • state the hypothesis to be tested in the experiment  • state one way the control group will be treated differently from the experimental group  • identify two factors that must be kept the same in both the control group and the experimental group  • identify the dependent variable in the experiment  • state one result of the experiment that would support the hypothesis