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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Which observations below describe chemical properties?

(a) Sodium metal reacts violently with water.

(b) The combustion of octane (a compound in gasoline) gives CO2 and H2O.

(c) Chlorine is a green gas.

(d) Heat is required to melt ice.

Interpretation Introduction

Interpretation:

From the given statements, the chemical property has to be identified.

Concept introduction:

Chemical property: The term refers to chemical reactions that a substance might undergo.

Physical change: A change in which the substance retains in form or state without altering in composition.  It is temporary and easily reversible.

Chemical change: A change in which the substance loses its identity and produces one or more new substances by change in its composition.  It is permanent and not easily reversible.

Explanation

Reason for true statements

Option a): Sodium metal reacts violently with water.

The above statement result in the new substance formation (sodium hydroxide and hydrogen gas) where metal and water lost its identity.  Hence, the statement C is the chemical property.

Option b): The combustion of octane gives CO2andH2O.

The above statement result in the new substance formation (carbon dioxide and water) where octane lost its identity

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