Chapter 1, Problem 20QRT

(a)

Interpretation Introduction

Interpretation:

The number of significant figures present in the measured quantity of $\text{1}{\text{.022 ×10}}^{\text{2}}\text{km}$ has to be given.

Concept Introduction:

Significant digits:

In a number, the digits which contribute to the precision of the number are said to be significant digits.

Rules for determination of significant digits in a number:

• All non-zero digits are significant.
• The zero’s appearing between two non-zero digits are significant.
• The zero’s before the non-zero numbers are not significant.
• Zero’s after non-zero number without decimal are non-significant.
• Zero’s after non-zero number with decimal are significant.
• Zero’s after the decimal point are significant.
• Any numbers with scientific notation are significant.

(b)

Interpretation Introduction

Interpretation:

The number of significant figures present in the measured quantity of $\text{34}{\text{m}}^{\text{2}}$ has to be given.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The number of significant figures present in the measured quantity of $\text{0}\text{.042}\text{L}$ has to be given.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

The number of significant figures present in the measured quantity of $\text{28}\text{.2}{}^{\text{o}}\text{C}$ has to be given.

Concept Introduction:

Refer to part (a).

(e)

Interpretation Introduction

Interpretation:

The number of significant figures present in the measured quantity of $\text{323}\text{.}\text{mg}$ has to be given.

Concept Introduction:

Refer to part (a).

(f)

Interpretation Introduction

Interpretation:

The number of significant figures present in the measured quantity of $\text{420}\text{g}$ has to be given.

Concept Introduction:

Refer to part (a).