A quick lesson in e-mail etiquette
Dear Ms. Schnell,
I am in you ___period chemistry class and think I might of copied down your website incorrectly since I have tried reaching it many times and from different computers. The link I copied down is this https://www.greenechemistry.wikispace.com/ and it hasn't been working for me. If I did copy it down wrong as I suspect would you please send me the actual link. I am very sorry for disturbing you but thank you for reading this.
Thank you,
________ Div. ___Chemistry ____st/th period.
Elements, Compounds, and MixturesMs. Schnell
Lane Tech College Prep2014-2015
How are Elements and Compounds Different?
And
VS
NaCl
salt
Distinguishing Elements and Compounds
Element - the simplest form of matter that has a unique set of properties. *Every atom of an element has the same number of protons
Ex: Carbon ,helium, lithium
Compound - a substance that contains two or more elements combined in a fixed proportion
Ex: Magnesium oxide (MgO), water (H2O), Sodium Chloride (NaCl)
Breaking Down Compounds
In general, Compounds CAN be broken down into simpler substances by chemical or physical changes. Elements cannot.
Ex: When sugar is heated, it goes through a chemical change
Sugar —> Carbon + Water
compound element compound
C12H22O11 —> C H2O
Mixtures
Homogeneous Mixture Heterogeneous Mixture Vs
• The same throughout• Also called a “solution”• Ex: Apple juice, milk,
NaOH solution (this means that NaOH has been dissolved in water)
• contains regions that have different properties from those of other regions
• Ex: water and oil, chocolate chip cookies, a mixture of salt and pepper
• A mixture can be defined as: something that has variable composition. *Mixtures can be separated into
pure substances- elements or compounds• EX: AIR is a mixture of oxygen, nitrogen, water, carbon dioxide, argon,
and other pure substances• wood is a mixture (composition varies depending on what type of tree
it originated from)
Element, Compound, Mixture
Fill in the Concept Map
Matter
Pure Substance
Mixture
Element Compound Homogeneous Heterogeneous
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