A. none of the above
B. 12000 m/s
C. 0.53 m/s
D. 1.875 m/s

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

Which element is least likely to undergo a chemical reaction

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?