True or false? Water changes from a liquid to a gas during evaporation, which is an example of a chemical change. False! Evaporation is a physical change. This is because physical changes occur ...

For example, if carbon atoms react with oxygen ... there will be a colour change. A large energy change – Many chemical reactions give off lots of energy, like burning, and a few absorb energy ...

All living things depend on millions of chemical reactions ... how fast an enzyme can change a substrate into a product. Changes in temperature or acidity can make enzyme reactions go faster or slower ...

Most cell signals are chemical in nature. For example, prokaryotic organisms have ... it undergoes a conformational change, which in turn launches a series of biochemical reactions within the ...