ure sodium metal explodes when it makes contact with water. In its natural state, chlorine is a deadly, poisonous gas. When these two chemicals combine, they form a harmless, white powder known as sodium chloride or table salt. Which of the following statements does this information support?

Question

A.
When substances are chemically combined, the properties of the new substances that are formed are the same as the properties of the original substances.
B.
Heat must be added in order to change the chemical properties of substances.
C.
The properties of substances change during chemical reactions but then later go back to their original condition.
D.
When substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances.
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Answer 1

The information provided supports the following statement:

D. When substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances.

This is evident from the fact that sodium is a reactive metal, chlorine is a toxic gas, but when they combine, they form sodium chloride, which is a harmless compound commonly known as table salt. The properties of the resulting substance (sodium chloride) are clearly different from the properties of the individual substances (sodium and chlorine).