What is the oxidation state of Br?
O A. -7
O B. +1
O c. +7
O D. -1

Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces

In an exothermic reaction, energy may be released to the surroundings in the form of question 4 options: heat light thermal all of the above

Which of the following statements best explains why chemistry is testable a) it can measure data by experiments b) it cannot add new evidence c) it cannot be verified d) it is biased