question: Write a question you would see in a school textbook. OPTIONS:
- when it is reversible
- when it can be repeated
- when it requires heat to make it happen
- when energy is released by the process
answer: A student mixed baking soda with vinegar and observed that the reaction was endothermic. When is a reaction endothermic?

question: Write a question you would see in a school textbook. OPTIONS:
- endocrine and skeletal
- excretory and nervous
- circulatory and respiratory
- digestive and reproductive
answer: Which two body systems are involved in inhaling oxygen and exhaling carbon dioxide?

question: Write a question you would see in a school textbook. OPTIONS:
- kinetic energy.
- physical changes.
- chemical changes.
- potential energy.
answer:
An electrical circuit can be used to break down water into hydrogen and oxygen. In this process, electrical energy produces