Consider the following separations of materials. State whether a physical process or a chemical reaction is involved in each separation.

Which of the following is an illustration of the law of constanticomposition? A) Water is a compound. B Water can be separated into other substances by a chemical process. C Water and salt have different boiling points. D) Water is 11% hydrogen and 89% oxygen by mass. Water boils at 100 °C at 1 atm pressure,

True or False When a physical change occurs,  a change in state occurs which indicates that a new substance has been formed.

In a lab students tested two properties of four substances. The results of the tests are shown the table below. Substance Phase at room Reaction with Reaction to flame temperature water Hydrogen Colorless Gas None Explodes Potassium Silver Solid Bubbling and reaction is hot. Burns and is likely to explode Sulfur Yellow Solid None Burns slowly and turns a color Strontium chloride White Crystalline Solid Dissolves Melts Which substance and explanation proves that no chemical change took place? O A. Hydrogen because it did not react with water and will explode when exposed to a flame. O B. Potassium because it bubbles in water and will explode when exposed to a flame Type here to search