Pure vs Mixture - Chemical Properties and Interactions

Pure vs Mixture - Chemical Properties and Interactions

Matter

Anything that has mass and takes up space.

Mass

The measure of the amount of matter a substance contains. Can be measured using a balance like the one in the picture or an electronic balance.

Measuring Mass

Volume

A measure of how much space something takes up.

Open Ended

What is one way to measure VOLUME?

Pure Substances

• ELEMENT

• An element is a pure substance that connot be broken down into different substances.

• Each element is made out of a single kind of atom

Multiple Select

Identify the Elements

• Iron (Fe)

• Water (H₂O)

• Hydrogen (H)

• Carbon Dioxide (CO₂)

• Silicon (Si)

Pure Substances

• COMPOUND

• A compound is formed when two or more elements combine chemically

• A compound made of only one kind of molecule is pure - For Example: H2O

Multiple Select

Which are pure substances? (Compounds)

• Water (H₂O)

• Air

• Sunscreen

• Sodium Chloride (NaCl)

• Carbon Dioxide (CO₂)

Mixtures

• Made up of many different kinds of atoms and molecules.

• Form when two or more different substances combine physically but not chemically.

• You can separate a mixture relatively easily

Examples of Mixtures

• Some are hard to tell because they may look like one substance: Salt water, Air

• Some are easy because the components look different from one another: Cookie Dough!

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Multiple Choice

Pure or Mixture? Air

• Pure

• Mixture

Multiple Choice

Pure or Mixture? Argon Gas

• Pure

• Mixture

Multiple Choice

Pure or Mixture? Salt (NaCl)

• Pure

• Mixture

Physical Properties

You can observe physical properties without changing the substance.

Physical Properties

• State of Matter - Solid Liquid Gas?

• Color

• Melting

• Conductivity - Does it conduct electricity or heat?

Solubility

A physical property - The measurement of the ability if a solid to dissolve into a liquid

Density

A physical property - The amount of matter in a given space or volume

Multiple Select

Which would float to the top?

• 1.3 g/ml

• .6 g/ml

• 3.5 g/ml

Chemical Properties

You can ONLY observe this type of property when atoms of matter are rearranged = CHEMICAL CHANGE

Chemical Properties

• Flammability

• Combustibility

• Rust Ability

Flammability

The ability of something to burn or ignite - can cause fire or combustion

Multiple Choice

Chemical or Physical Property? Odor

• Chemical

• Physical

Multiple Choice

Chemical or Physical Property? Rusting

• Chemical

• Physical

Open Ended

If you were given a pure substance - how could you determine what it was? How could you describe it to me?

For example - a clear liquid.