Chapter 2 - Matter Section 1 – Classifying Matter Section 2 – Properties of Matter Section 3 – Changes of Matter

Section 1 – Classifying Matter Previously, we watched a 30 minute video on “Properties of matter” Key Questions 1] How can matter be classified? 2] Why are carbon and copper classified as elements? 3] How are elements related to compounds? 4] What is the difference between a pure substance and a mixture?

TN Standards CLE 3202.1.1 – Evaluate pure substances and mixtures

Matter Bellwork A – Which of the following is not an example of matter : ( sunglasses, beach towel, sunlight, water ) Bellwork B – Elements, Compounds, and Mixtures are all ____________ ?

Matter Matter – Anything that has mass and takes up space Matter is either an element, compound, molecule, or mixture Element – a substance that cannot be broken down into simpler substances by chemical means Compounds – substance made of atoms from different elements BONDED TOGETHER

More on Matter Molecule – smallest unit of a substance that behaves like the substance Not always the same as a compound!! Elements combined but can be same element Compounds are molecules; molecules not always compounds Examples of substances that exist in molecule form, BUT ARE NOT COMPOUNDS: Oxygen and Nitrogen gas in Air Hydrogen and Chlorine gas Phosphorus If a compound: each molecule of that compound will have two or more chemically combined ( BONDED ) elements

More on Matter Compounds have unique properties Table salt, water, sugar, gasoline Compounds have their own chemical formulas H2O, CO2, H2, HF

Atoms What about Atoms – are ( DO ) they matter? Yes! Atoms – smallest unit of an element that maintains the chemical properties of that element Atoms that make up a molecule act as a unit Again, this can be a compound or only a molecule

Pure Substances & Mixtures Pure Substance – matter with definite composition ( or concentration of the components ) Elements, compounds, and molecules Mixtures – combination of substances NOT chemically combined Heterogenous and Homogeneous

Pure Substances and Mixtures What is the difference? Chemical bonds ( mixtures are not chemically bonded ) Example of pure substance? Water, carbon dioxide Example of homogeneous mixture? Salt or sugar water ( dissolved ), vinegar Example of heterogenous mixture? Pulpy orange juice, skittles, salad

Mixtures - Defined Homogeneous – looks the same throughout Heterogenous – does not look the same throughout

Concept Map Word List: Matter, Pure Substances, Atoms?, Elements, Compounds, Mixtures, Homogeneous, Heterogeneous,

Bellwork What are the two different types of mixtures?

Bellwork What are the two different types of mixtures? Homogeneous and Heterogeneous

TN Standards CLE 3202.1.1 – Explore matter in terms of its physical and chemical properties CLE 3202.1.4 – Investigate chemical and physical changes