A theory is an attempt to explain what happens is an experiment. True or false?

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

Which term refers to a property that depends only on the amount of a substance? ©@