Chapter 1, Problem 30QRT

(a)

Interpretation Introduction

Interpretation:

The property which is italicized has to be identified as physical or chemical property and the reason has to be given.

Dry ice sublimes (changes directly from a solid to a gas) at $\text{-78}{\text{.6}}^{\text{°}}\text{C}$.

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.

(b)

Interpretation Introduction

Interpretation:

The property which is italicized has to be identified as physical or chemical property and the reason has to be given.

Methanol (methyl alcohol) burns in air with a colorless flame.

Concept Introduction:

Refer part (a).

(c)

Interpretation Introduction

Interpretation:

The property which is italicized has to be identified as physical or chemical property and the reason has to be given.

Sugar is soluble in water.

Concept Introduction:

Refer part (a).

(d)

Interpretation Introduction

Interpretation:

The property which is italicized has to be identified as physical or chemical property and the reason has to be given.

Hydrogen peroxide, ${\text{H}}_{\text{2}}{\text{O}}_{\text{2}}$, decomposes to form oxygen,${\text{O}}_{\text{2}}$, and water, ${\text{H}}_{\text{2}}\text{O}$.

Concept Introduction:

Refer part (a).