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1. Add BLUE ToC to NB P.49-50◦ TITLE: Elements & the Periodic

Table

DO NOW: 2/19/15

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What is the difference between a mixture and a pure substance? Illustrate & describe.

2/19/2015In ?: P.52

Mixtures and Pure Substances Matter can be classified as a mixture or a pure

substance.

• A pure substance always has the same composition throughout the substance.

• Pure substances are of two types:• Elements and Compounds.

Pure Substances

Water is a compound. All thecomponents are the same—H2O molecules.

Pure Substances

ElementsCompounds

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Elements are made of only one type of atom and CANNOT be broken down chemically into simpler substances.

Ex. Gold, iron, hydrogen Compounds are made of two or more

different types of atoms and can be chemically broken down into elements. • Ex. Water or H2O can be broken down into

hydrogen and oxygen by using electricity Molecules formed when two or more atoms join

together chemically. ◦ All compounds are molecules but not all

molecules are compounds.

What is the difference between an element, a molecule, & a compound??

Is the water compound also a molecule? Yes

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Read the question to yourself FIRST Decide on your answer INDEPENDENTLY. On the count of 3 you will shout out what

you think is the correct answer. Use your self-control when “shouting”.

Shout out on the count of 3!

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Element, Compound, or Molecule? Copper Wire

Element

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◦ozone

Element, Compound, or Molecule?

Molecule

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Element, Compound, or Molecule?

Compound & Molecule

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Aluminum

Element, Compound, or Molecule?

Element

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When material is added to a gas or liquid, the material added is called the solute and the material the solute is added to is called the solvent.

Mixtures are created by adding at least one material to another.

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In salt water, what is the SOLUTE?

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In salt water, what is the SOLVENT?

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When a solute such as sugar is added to a solvent such as water the final product will be a solution (e.g. sugar water)!

Solute= solid part that GETS dissolved. Solvent= the liquid part that DOES the

dissolving.

A solution

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Mixtures can be heterogeneous or homogeneous.

A mixture in which different materials can be easily distinguished.

Heterogeneous mixtures are those where the substances are not distributed evenly.

They have different properties in different parts of the mixture.

They usually involve a mixture of a solid in a solid.

Pizza, dry soup, chex mix, trail mix are all examples.

Heterogeneous Mixture

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Exist where materials are evenly distributed throughout.

The mixture has the same properties throughout. ◦ Ex. Vanilla ice cream, lemonade, air in vacant

room.

Homogeneous Mixtures

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Mixtures can be classified into three groups:

1. suspensions2. colloids 3. solutions

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Suspension mixtures have larger particles in a liquid or gas.

Most mixtures are suspension mixtures. A suspension is a heterogeneous mixture

containing a liquid in which visible particles settle.◦ Italian salad dressing is a good example◦ River water, snow globe

1. Suspensions

◦A homogenous mixture in which two or more substances are uniformly spread out. For example salt water.

2. Solutions

A colloid is a homogeneous mixture that like a solution never settles. ◦ Milk, mayonnaise, and smoke are examples.

Properties of both solutions and suspensions One way to tell a colloid from a solution is

that you cannot see clearly through a colloid and the particles never settle out. ◦ Ex. milk appears white because its particles

scatter light. (Called the Tyndall Effect.)

3. Colloids

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Whiteboarding Review! You will have 10-20 seconds to answer each

question A blank board is NOT acceptable. No Doodling! When you are finished writing your answer,

put your board face down on your desk until I say “boards up!”

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Element, Compound, or Mixture?

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Element, Compound, or Mixture?Copper

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Element, Compound, or Mixture?Table Salt: AKA (Sodium Chloride)

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Heterogeneous or Homogeneous?

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Element, Compound, or Mixture?Water (H2O)

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Element, Compound, or Mixture?Aluminum

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Element, Compound, or Mixture?

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Solute Solvent

=

??+

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Add notes to NB P.53. Put away whiteboarding materials.

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Your group will be tasked with sorting your cards at the table into three groups:◦ Elements, Compounds, and Mixtures

Upon completion raise your hand to get checked!

Card Sort in Groups

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Add to NB P. 51

Add card sort WS to NB

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EXIT QUIZ TIME!!!

Clear off desks

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Brainpop! Compounds versus Mixtures (If time)

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Provide two examples for EACH vocabulary word in the chart below.

2/19/15 Name:___________Exit Quiz P:____

Element Compound Homogenous Mixture

Heterogeneous Mixture

Molecule

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MixturesA mixture is a combination of

two or more substances where there is no chemical combination or reaction.

Mixtures combine physically in no

specific proportions. They just mix. Solids, liquids

and gases can be combined

to create a mixture.