Elements, Compounds & Mixtures 8th Grade IPC

. . Matter Mixtures Pure substance Elements Compounds Multiple substances

MOLECULE: a group of atoms that are held together by chemical forces MOLECULE: a group of atoms that are held together by chemical forces. Atoms that make up a molecule act as a unit.

Types of pure substances Elements Compound Simplest, pure substance, One type of atom present Can’t be broken down physically Represented by symbols. Example: Na-Sodium Fe-Iron 2 or more elements chemically combined. Represented by chemical formulas. Unique properties that are different from the elements that make it up. Example: Water H2O, Salt NaCl

Element vs Compound Element is a SUBSTANCE made of the same type of atoms Compound is made of DIFFERENT ELEMENTS in a definite proportion ELEMENTS and COMPOUNDS are PURE SUBSTANCES because they CANNOT BE SPLIT APART

Types of Mixtures Mixtures 1. Made of more than one kind of pure substance. 2. Can be separated or pulled apart physically ( they aren’t chemically combined) 3. 2 types: Heterogeneous Homogeneous

Describe in a T-Chart Pure substances Mixtures

Heterogeneous Mixtures 1. Not the same throughout. 2. Large easily seen particles that can be separated out. 3. Heterogeneous liquid mixtures are also known as suspensions. Settles after standing. Examples: salad, Italian dressing,

Homogeneous Mixtures Homogeneous Mixtures 1. Appears same throughout 2. Well mixed 3. Will not completely settle upon standing, 4. Tiny unrecognizable particles 5. Homogenous mixtures are also called Solutions. Examples: Kool-aid

Make a T-Chart to compare and contrast the two types of mixtures Homogeneous Mixture Heterogeneous mixture

Suspensions (Heterogeneous Mixtures)

Solutions

Mixture Question? What is the difference between a heterogeneous and homogeneous mixture?

Graphic Organizer Create a graphic organizer to show the relationship between the following terms: elements compounds homogeneous mixtures heterogeneous mixtures solutions