When the thermometer is cooled, the molecules move more slowly, get closer together, and move down in the tube. When the thermometer is heated, the molecules move faster, get slightly further apart, ...

Finally, students conclude that different substances have characteristic chemical reactions and that these reactions can be used to identify a substance. The bulb of the thermometer must be completely ...

The temperature on the thermometer has fallen, meaning it is an endothermic reaction. When ammonium chloride powder is mixed with barium hydroxide powder and stirred, a chemical reaction takes place.