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

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Presentation on theme: "Chapter 2 - Matter Section 1 – Classifying Matter Section 2 – Properties of Matter Section 3 – Changes of Matter."— Presentation transcript:

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

2 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?

3 TN Standards CLE – Evaluate pure substances and mixtures

4 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 ____________ ?

5 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

6 More on Matter Molecule – smallest unit of a substance that behaves like the substance – Not always the same as a compound!! – Atoms 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

7 More on Matter Compounds have unique properties – Table salt, water, sugar, gasoline Molecules have their own chemical formulas – H 2 O, CO 2, H 2, HF

8 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

9 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

10 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

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

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

13 Bellwork What are the two different types of mixtures?

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

15 Section 2/3 – Properties & Changes of Matter Key Questions 1] Why are color, volume, and density classified as physical properties? 2] Why are flammability and reactivity classified as chemical properties? 3] Why is getting a haircut an example of a physical change? 4] Why is baking bread an example of a chemical change? 5] How can mixtures and compounds be broken down?

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

17 Physical Properties Physical properties are characteristics observed without changing the identity of the substance Examples: color, texture, density, melting temperature, boiling temperature Physical properties help determine many uses

18 Chemical Properties Chemical properties are characteristics observed only by changing the identity of the substance Examples: flammability, reactivity

19 Changes Physical changes do not change the identity of the substance – Cutting hair, Cutting paper – Can be reversed Chemical changes do – Burning, Rusting, Color, Smell – Can’t be reversed


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