Chapter 2.1 Elements, Compounds, and Mixtures: an Atomic Overview

Question 1

Three types of Matter

Answer 1

1. Elements - Substance: Matter whose composition is fixed
2. Compounds - Substance: Matter whose composition is fixed
3. Mixtures - Not substance : Variable Composition

Question 2

Molecule

Answer 2

an independent structure of two or more atoms bound together

Question 3

Compounds

Answer 3

consists of two or more different elements that are bonded chemically

Question 4

Elements

Answer 4

simplest type of matter with unique physical and chemical properties

Question 5

Characteristics of Compounds

Answer 5

• All compounds = the elements are present in fixed parts by mass (fixed mass ratio) because each unit of the compound consists of a fixed number of atoms of each element
• Its properties are different from the properties of its component elements
• can be broken down into simpler substances by chemical changes

Question 6

Characteristics of Elements

Answer 6

• cannot be broken down into simpler type of matter
• each element is unique because the properties of its atoms are unique
• several elements occur in molecular form

Question 7

Mixtures

Answer 7

consists of two or more substances (elements and/or compounds) that are physically intermingled

Question 8

Characteristics of Mixtures

Answer 8

• Components can vary in their parts by mass (NOT FIXED)
• Retains many of the properties of its components ex. Saltwater
• can be separates into their components by physical means