Element Compound and Mixture.pptx...........

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1. Elements, Compounds and Mixtures

2. Examples of Elements, Compounds and Mixtures Lesson Outline Elements Compounds Mixtures

3. Think Pair Share How would you differentiate an elements from compounds and mixtures? Give examples of elements, compounds and mixtures. ? ? Take a moment to think of your answers to the questions below. Find a partner and take turns discussing your answers. Finally, volunteer and share what you discussed with the whole class.

4. How can you determine whether something is an element or not? They are all listed on the periodic table. ELEMENT SONG

5. What is an element? An element is a substance that cannot be broken down into two or more simpler substances by any chemical means. - They are arranged in the Periodic Table, classified as metals and non-metals. - They may consist of atoms of same element or molecules of the same element. Metals (excluding hydrogen) Non-metals (including hydrogen)

6. Pure substance Made of only 1 type of particle Ex: copper wire only has copper atoms Can’t be separated into simpler substances by chemical or physical means ELEMENTS

7. Each has a unique set of properties Called characteristic properties Can be physical or chemical Classified by their properties Metals Nonmetals Metalloids ELEMENTS density melting pt. flammability reactivity Elements Metals Nonmetals Metalloids

8. Physical Properties of metals and non-metals Metals Non-metals Shiny appearance Dull appearance Solids at r.t.p (except mercury) Gases, liquids or solids at r.t.p (room temp & pressure) Malleable, Ductile , Sonorous Brittle if solid (general) High melting and boiling points Low melting and boiling points Good conductors of heat Poor conductors of heat Good conductors of electricity Poor conductors of electricity (expect carbon and graphite)

9. Do you know any compounds? How are they different from elements? Characteristics Found in nature more often than pure elements Have more than one element Elements are chemically bonded to each other Mg + O 2 makes MgO Pure substances that occur in fixed ratios by mass 1g H to 8g of O in every water molecule Can’t be separated by physical means Have their own unique set of properties COMPOUNDS

10. Heat can be used to break down compounds into elements or simpler compounds. Such a chemical reaction is called thermal decomposition , electrical decomposition or electrolysis. Compounds can be Decomposed Mercury(II) oxide Oxygen

11. Molecules- Elements or compounds? A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together. It can be a molecule of an element E.g. N 2 , O 2 , S 8 It can be molecule of a compound. H 2 O, CO 2 , NH 3 N N O O S S S S S S S S O H H O O C N H H H

12. CLASSIFICATION OF MATTER

13. lemonade meat and vegetable stew What is a mixture? It is composed of two or more substances that are combined, yet can still be separated into the original parts. Homogeneous has uniform composition all throughout Heterogeneous has varying composition

14. Mixtures 2 or more substances that are not chemically bonded So diff parts keep their own properties Ex: pizza granite Kool-aid Brass Jello Parts do not occur in a definite ratio Compare the 2 pepperoni pizzas

15. Mixtures Can be physically separated by Distillation Magnet Centrifuge Filtration Evaporation

16. Mixtures Can be heterogeneous (see diff pieces) or homogeneous (uniform appearance) Homogeneous mixtures are called solutions Heterogeneous mixtures include suspensions Colloids are classified as heterogeneous in some books and homogeneous in others

17. A mixture of two elements A mixture of two elements, e.g. neon (Ne) and hydrogen (H 2 )

18. A mixture of one element and one compound A mixture of one element and one compound, e.g. hydrogen (H 2 ) and ammonia (NH 3 )

19. A mixture of two compounds A mixture of two compounds, e.g. water vapour (H 2 O) and carbon dioxide (CO 2 )

20. Mr Alloy Alloy: What is it? It is a mixture of metals with other elements Alloy metals are generally stronger and better in physical properties Examples Steel (Iron + Carbon) Stainless Steel (Nickel + Iron + Chromium + carbon) Brass (Copper + Zinc) Yup! That’s ME!

21. Can you differentiate? Compound Mixture of element & compound Mixture of 2 elements-Alloy Molecules of an element Mixture of 2 elements