Regents Chemistry Exam June 2024 Question 5
5 Which statement describes a chemical property of sodium?
(1) It is silver in color.
(2) It has a density of 0.97 g/cm3 at room temperature.
(3) It has atoms with an atomic radius of 160 pm.
(4) It is highly reactive with water.
Solution:
During a chemical change the identity of a substance changes. A chemical change represents a reaction. Chemical property refers to the reactions that the substance can do. Examples of chemical properties are: burning of wood, reaction of metal with water etc. Choices 1,2, and 3 are physical properties since they do not represent a reaction. Choice 4 is a chemical property.
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