Chapter 1, Problem 75QRT

(a)

Interpretation Introduction

Interpretation:

The information that is given in the statement “A white chemical compound has a mass of $\text{1}\text{.456}\text{g}$.  When placed in water that contains a dye, it causes the red color of the dye to fade to colorless” has to be classified whether it is qualitative or quantitative and whether it relates to physical or chemical property.

Concept Introduction:

Physical properties:

The properties which are measured or observed without change in composition of matter are said to be physical properties.  These includes appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity and so on.

Chemical properties:

The properties that are observed when a substance undergoes any chemical reaction are said to be chemical properties.  These include flammability, toxicity, stability, heat of combustion, reactivity, acidity, basicity and so on.

Qualitative properties:

The measure of the quality of something rather than its quantity is said to qualitative observation.  It includes size, appearance, value and so on.

Quantitative properties:

The measure of the quantity of something rather than its quality is said to be quantitative observation.  Quantity of the substance is indicated in numerical values.

(b)

Interpretation Introduction

Interpretation:

The information that is given in the statement “A sample of lithium metal, with a mass of $\text{0}\text{.6}\text{g}$, was placed in water.  The metal reacted with the water to produce the compound lithium hydroxide and the element hydrogen” has to be classified whether it is qualitative or quantitative and whether it relates to physical or chemical property.

Concept Introduction:

Refer to part (a).