Vinegar, fruit juice and cola are examples of
A: strong acids
B: strong bases
C: weak acids
D: weak bases

Can someone me with 3 and 4 plz. this is for masteries test.

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?