4. A blue crystal is placed in water. After much stirring, the crystal disappears and the water
becomes blue. The liquid is then heated.
Eventually, all the water evaporates and
many small blue crystals appear. Has a
chemical reaction taken place? Explain.

Working with si (metric) units for each of the following commonly used measurements, indicate its symbol. liter gram milliliter kilogram meter centigram milligram centimeter kilometer second millimeter milliseconds

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false