1) An atom is made up of protons, electrons, and neutrons. When two or more atoms combine chemically, it forms a molecule. 2) A chemical reaction is the rearrangement of atoms to form new molecules. Some reactions release or absorb energy. 3) Chemical properties can only be observed when substances change into different substances, such as through flammability or reactivity.

1. Physical Science Chemical Properties

2. Atoms and Molecules An Atom is made up of protons, electrons, and neutrons. An Element is a unique number of protons. When 2 or more atoms combine together chemically, it is called a molecule.

3. Molecular Elements These are allotropes of carbon

4. Compounds 2 or more elements combined in a molecule

5. What is a Chemical Reaction? It is the rearrangement of atoms to form new molecules. CH4 + 2O2 CO2 + 2H2O

6. What is a Chemical Reaction? It is the rearrangement of atoms to form new molecules. CH4 + 2O2 CO2 + 2H2O

7. What is a Chemical Reaction? It is the rearrangement of atoms to form new molecules. CH4 + 2O2 CO2 + 2H2O

8. What is a Chemical Reaction? Some chemical reactions are exothermic They release energy as heat, light, or other forms.

9. What is a Chemical Reaction? Some chemical reactions are endothermic They absorb energy from the environment to proceed.

10. Chemical Properties Chemical properties can only be observed when the substances in a sample of matter are ________________. _____ and _____ are examples of chemical properties

11. Chemical Properties Chemical properties can only be observed when the substances in a sample of matter are ________________. Changing into different substances _____ and _____ are examples of chemical properties

12. Chemical Properties Chemical properties can only be observed when the substances in a sample of matter are ________________. Changing into different substances _____ and _____ are examples of chemical properties Flammability Reactivity

13. Triggers to Chemical Reactions Most reactions do not occur spontaneously. Most require some trigger to get started. This could be a spark or even a touch. Let’s watch a fun video of a chemical reaction that is sensitive to the touch!

14. Nitrogen Triiodide 2 NI3 (s) -> N2 (g) + 3 I2 (g),

15. Nitrogen Triiodide Decomposition

16. Some Fun Experiments Mr. Taylor Does Nitrogen Triiodide http://www.youtube.com/watch?v=hERVtZEZrFQ

17. Some Fun Experiments THERMITE! http://www.youtube.com/watch?v=sjLgzgflCk8

18. Some Fun Experiments Pure Metallic Sodium in Water! http://www.youtube.com/watch?v=gFnNXkcoDSs

19. Recognizing Chemical Change Chemical changes are taking place if you see a _____, ______, or ______. Change in color Production of a gas Formation of a precipitate **If you are watching by recording, send me the sentence above with the answers**

20. Mixtures Iron and Sulfur powder in a the mixture So, it is hypothesis time: How can we separate the iron from the sulfur? Enter some ideas in the chat box.

21. Mixtures Iron and sulphur – the mixture How can we separate the iron from the sulphur? Use a magnet! Iron is magnetic, sulfur is not...

22. Turning an iron-sulphur mixture into a Compound Heat Fe + S FeS

23. When iron and sulphur react + sulphur (S) atoms iron (Fe) atoms

24. When iron and sulphur react + sulphur (S) atoms iron (Fe) atoms iron sulphide (FeS) molecules

25. Differences between compounds and mixtures MIXTURES COMPOUNDS Mixtures can be separated easily Compounds can not be separated

26. Differences between compounds and mixtures MIXTURES COMPOUNDS Mixtures can be separated easily Mixture have the properties of the substances present in it Compounds can not be separated Compounds do not have the properties of the elements

27. Differences between compounds and mixtures MIXTURES COMPOUNDS Mixtures can be separated easily Mixture have the properties of the substances present in it No chemical change takes place when a mixture is made Compounds can not be separated Compounds do not have the properties of the elements A compound is always formed due to a chemical reaction

28. Differences between compounds and mixtures MIXTURES COMPOUNDS Mixtures can be separated easily Mixture have the properties of the substances present in it No chemical change takes place when a mixture is made There is no heat taken in or given out when a mixture is made Compounds can not be separated Compounds do not have the properties of the elements A compound is always formed due to a chemical reaction Heat is either taken in or given out when a compound is made

29. Differences between compounds and mixtures MIXTURES COMPOUNDS Mixtures can be separated easily Mixture have the properties of the substances present in it No chemical change takes place when a mixture is made There is no heat taken in or given out when a mixture is made A mixture can contain elements in any proportion Compounds can not be separated Compounds do not have the properties of the elements A compound is always formed due to a chemical reaction Heat is either taken in or given out when a compound is made A compound always contains the elements in fixed proportions, e.g. FeS contains 7g of iron to 4g of sulphur