Unit+4+Compounds

= [|Unit 4 Assessment] =

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** === **‍** __** compound **__ **- a substances whose molecules contain atoms from different elements** ===

=== ‍‍ __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 __

Study Jams: Elements and Compounds Bite Size Chemistry Compounds - Chem4Kids A Closer Look at Physical and Chemical Changes Evidence of Chemical Changes Mr. Parr - Atom Bonds

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

= = =__ Other Reactions __=

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

= = =__ Interactive Games __= = = Periodic Table Game Kitchen Chemistry Chemistry Rags to Riches Alien Juice Bar (pH and Chemical Change) Reversible and Irreversible Changes Physical Vs. Chemical Mr. Parr Atom Bonds

=__Journal Entries:__=