Unit+4++Compounds

Objectives 6.5c: Students can differentiate between elements and compounds on the most basic level.

6.5d: Students can identify the formation of a new substance due to a chemical change.

Guiding Questions

1. What is the difference between elements and compounds?

2. How is chemical change identified?

3. How can scientists determine whether a new substance is formed during a reaction?

VOCABULARY ===‍ __physical change__ - a change in which the properties of a substance change but the identityof the substance always remains the same; a change in the size or state of a substance, usually from temperature, pressure or motion ===

===‍ ‍ __chemical change__ - a change in which the identity of a substance changes due to its chemical properties and forms a new substance or substances ===

===‍ ‍ __element__ - a substance composed of atoms having an identical number of protons in each nucleus ===

===‍ ‍ __chemical symbol__ - a one- or two-letter abbreviation for an element's name (O - oxygen) ===

===‍ ‍ __chemical formula__ - a set of symbols that describe the number and kind of elements in a compound (NaCl) ===

‍ ‍ __matter__ - anything that has mass and takes up space
===‍ ‍ __molecule__ - a particle of matter made up of two or more atoms joined tightly together ===

===‍ ‍ __physical properties__ - any characteristic of a substance, such as state, color and volume, that can be observed or measured without changing or attempting to change the material ===

===‍ ‍ __chemical properties__ - any characteristic, such as the ability to burn, that allows a substance to change into a new substance with different properties ===

===‍ ‍ __oxidation__ - a common form of chemical reaction which is the combination of oxygen with various elements and compounds ===

===‍ ‍ __tarnish__ - a thin layer of corrosion that forms over copper, brass, silver, aluminum and other similar metals as their outermost layer undergoes a chemical reaction ===

===‍ ‍ __rust__ - corrosion that forms on iron and iron-coated materials as it undergoes a chemical reaction ===

===‍ ‍ __exothermic__ - describes a process which RELEASES thermal (heat) energy ===

===‍ ‍ __endothermic__ - describes a process which ABSORBS thermal (heat) energy ===

Important Links media type="youtube" key="yxb4AtBf52M" height="315" width="560" Study Jams: Elements and Compounds Bite Size Chemistry Compounds - Chem4Kids How it Works: Elements and Compounds A Closer Look at Physical and Chemical Changes Evidence of Chemical Changes

Chemical Change Lesson

In Class Investigations Hot Pack Copper from Aluminum Rotten Egg Gas Instant Sunshine Instant Sunshine slow motion

Other Reactions Color Change Reaction Sugar Snake Oxidation Explosion Underwater Fireworks - Oxidation Elephant Toothpaste Orange Sorbet Sizzling Sunset Smokescreen On Demand Surprise Fire Genie in the Bottle

Songs and Games

Element Lab Chemistry Rags to Riches Alien Juice Bar (pH and Chemical Change) Kitchen Chemistry Reversible and Irreversible Changes Periodic Table Game