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