What’s the MATTER Classify Matter

Matter, Classify Matter At the conclusion of our time together, you should be able to: 1. Classify a mixture of matter based on their physical and chemical properties 2. Characterize various types of matter

Types of Matter  Pure Substance- Matter with a fixed composition It has distinct properties Examples =elements compounds

Types of Matter  Mixtures- Most matter is a mixture The composition is not fixed (changes from sample to sample) Two Types – Homogeneous Heterogeneous

Homogeneous Mixtures  Composition is uniform throughout Solution-  Particle size = 0.01 – 1 nm  Doesn’t settle out upon standing  Can’t be separated by filtering  Doesn’t scatter light  Example = salt water

Colloid-  Particle size = 1 – 1000 nm  Doesn’t settle out upon standing  Can’t be separated by filtering  Scatters light (Tyndall Effect)  Examples = milk, gelatin, smoke Homogeneous Mixtures

Heterogeneous Mixtures - Suspension  The sample varies in composition, properties and appearance  No uniformity If a suspension: Particle size is greater than 1000 nm Particles settle out upon standing Can be separated by filtration Might scatter light Examples = soil, trail mix, pond water

Let’s Look at Some Examples:  Mixtures are variable combinations of 2 or more pure substances. Heterogeneous – visibly separate phases Homogeneous – Same throughout

Pure substance vs. Mixture Only ONE element has 2 or more or compound. elements/ (distilled water) compounds. Pure substance vs. Mixture Only ONE element has 2 or more or compound. elements/ (distilled water) compounds.

Distilled Water is a compound. an element. a solution. a mixture.

Air is a mixture of several gases. Name Formula amount Nitrogen N 2 78 % Oxygen O 2 21 % Argon Ar 1 % Carbon CO % Dioxide

Air is a mixture of several gases Name Formula Amount Neon Ne % Methane CH % Helium He % Krypton Kr % Hydrogen H % Xenon Xe %

Atoms are NOT the same as molecules. Air and oxygen are NOT the same. Helium and hot air are NOT the same. Atoms are NOT the same as molecules. Air and oxygen are NOT the same. Helium and hot air are NOT the same.

Helium and hot air are NOT the same.

What’s the MATTER Classify Matter Let’s Put it All Together in a Chart!!

Is the composition uniform? NoNoYes MATTER Can it be physically separated? Homo- geneous Mixture (solution) Hetero- geneous Mixture Compound MIXTURE PURE SUBSTANCE Yes NoNo Can it be chemically decomposed? NoNo Yes Suspensions Element Colloids

Matter, Classify Matter Let’s see if you can: 1. Classify a mixture of matter based on their physical and chemical properties 2. Characterize various types of matter

Putting sand and salt together makes a compound. an element. a mixture. a solution.

Pure Water is a compound. an element. a solution. a mixture. Pure Water is a compound. an element. a solution. a mixture.

Tap Water is a compound. an element. a solution. a mixture. Tap Water is a compound. an element. a solution. a mixture.

An atom is to an element, as a molecule is to a metal. nonmetal. metalloid. compound.

If different kinds of atoms are represented by different colored dots, which picture represents a sample of a compound?

If different kinds of atoms are represented by different colored dots, which picture below represents a mixture?

Which of the following illustrations represents a pure substance?

Salt (NaCl) is a common substance. Salt is which of these? atom element compound mixture Salt (NaCl) is a common substance. Salt is which of these? atom element compound mixture

A chocolate chip cookie is an example of a __________, because ______________. a. compound, the ingredients are chemically bonded. b. compound, it is the same throughout. c. mixture, you can separate out the chips. d. mixture, you cannot distinguish between the ingredients. A chocolate chip cookie is an example of a __________, because ______________. a. compound, the ingredients are chemically bonded. b. compound, it is the same throughout. c. mixture, you can separate out the chips. d. mixture, you cannot distinguish between the ingredients.

Which formulas represent compounds? O 2, H 2 O 2 CO 2, H 2 O H 2, CO 2 H 2, O 2 Which formulas represent compounds? O 2, H 2 O 2 CO 2, H 2 O H 2, CO 2 H 2, O 2

Which of the following is a compound? oxygen water nitrogen air