Question

Pure 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?

A.
Heat must be added in order to change the chemical properties of substances.
B.
When substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original 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 the same as the properties of the original substances.

Answer 1

B

Step-by-step explanation:

All substances have their own unique chemical and physical properties. When substances are chemically combined (i.e., when substances undergo a chemical reaction), the properties of the new substances that are formed are often different from the properties of the original substances.

Answer 2

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

Step-by-step explanation:

From the information given, the question was juxtaposing how dangerous the reactants Sodium and Chlorine were at their elemental, natural states with how harmless the product is by combining both of them. There isn't any other statement beside B which is supported by this.

Usually however, most reactions that make NaCl are done through acid-base titrations because they form the salt and water when neutralized.