How much energy should be transferred when 38.2 g of liquid bromine reacts with excess hydrogen gas to form hydrogen bromide? Is the energy being transferred from the system to the surroundings or from the surroundings to the system?

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.

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al