Chapter 2, Problem 56AP

(a)

Interpretation Introduction

Interpretation: If the elements silicon is hazardous, rare or neither should be identified.

Concept Introduction:

About 90% of earth is made up of 4 elements namely, iron, oxygen, magnesium and silicon. The other elements present in more than 1% are nickel, calcium, aluminum and sulfur. Elements such as sodium, potassium, chromium, cobalt, phosphorus, manganese and titanium are present in 0.1 to 1% range thus, they are rare elements. Some elements are considered to be hazardous as they affect the environment. They can be present in any components of the environment: atmosphere, land and water. They can be highly toxic and hazardous to humans.

(b)

Interpretation Introduction

Interpretation: If the elements neodymium is hazardous, rare or neither should be identified.

Concept Introduction:

About 90% of earth is made up of 4 elements namely, iron, oxygen, magnesium and silicon. The other elements present in more than 1% are nickel, calcium, aluminum and sulfur. Elements such as sodium, potassium, chromium, cobalt, phosphorus, manganese and titanium are present in 0.1 to 1% range thus, they are rare elements. Some elements are considered to be hazardous as they affect the environment. They can be present in any components of the environment: atmosphere, land and water. They can be highly toxic and hazardous to humans.

(c)

Interpretation Introduction

Interpretation: If the elements mercury is hazardous, rare or neither should be identified.

Concept Introduction:

About 90% of earth is made up of 4 elements namely, iron, oxygen, magnesium and silicon. The other elements present in more than 1% are nickel, calcium, aluminum and sulfur. Elements such as sodium, potassium, chromium, cobalt, phosphorus, manganese and titanium are present in 0.1 to 1% range thus, they are rare elements. Some elements are considered to be hazardous as they affect the environment. They can be present in any components of the environment: atmosphere, land and water. They can be highly toxic and hazardous to humans.

(d)

Interpretation Introduction

Interpretation: If the elements oxygen is hazardous, rare or neither should be identified.

Concept Introduction:

About 90% of earth is made up of 4 elements namely, iron, oxygen, magnesium and silicon. The other elements present in more than 1% are nickel, calcium, aluminum and sulfur. Elements such as sodium, potassium, chromium, cobalt, phosphorus, manganese and titanium are present in 0.1 to 1% range thus, they are rare elements. Some elements are considered to be hazardous as they affect the environment. They can be present in any components of the environment: atmosphere, land and water. They can be highly toxic and hazardous to humans.

(e)

Interpretation Introduction

Interpretation: If the elements lead is hazardous, rare or neither should be identified.

Concept Introduction:

About 90% of earth is made up of 4 elements namely, iron, oxygen, magnesium and silicon. The other elements present in more than 1% are nickel, calcium, aluminum and sulfur. Elements such as sodium, potassium, chromium, cobalt, phosphorus, manganese and titanium are present in 0.1 to 1% range thus, they are rare elements. Some elements are considered to be hazardous as they affect the environment. They can be present in any components of the environment: atmosphere, land and water. They can be highly toxic and hazardous to humans.