1. Bell Ringer (Feb 13) *Take out a sheet of paper
*Name in right hand corner
*Bell Ringers across top line
*Why is it important to understand matter and how it changes?

2. Pure Substances and Mixtures
(Page 99)
Essential Question:
How do we differentiate types of matter?

4. Pure Substances and Mixtures
Matter
Pure Substances Mixtures
Elements Compounds
Homogeneous Heterogeneous

5. 1. Pure Substance
*A substance that is made up of only one type of molecule (the smallest part of a substance that’s still the substance). NO NO

6. **Molecules:
*Elements: gold (Au), silver (Ag),

7. **Molecules:
*Elements: carbon C oxygen O hydrogen H

8. **Molecules:
*Elements (sodium Na, Chlorine Cl)

9. **Molecules:
Pizza – NO!!!!!!!!!
*Why Not???

10. 1. Pure Substance
*Can’t be changed into or broken down into other matter by physical changes

11. Pure Substances and Mixtures
Matter
Pure Substances Mixtures
Elements Compounds
Homogeneous Heterogeneous

12. * Elements – a substance made up of only 1 kind of atom
Gold
chlorine
sodium
sulfur

13. 118 Elements Pure Substances
Elements – substances made up of one or more of the same kind of atom
e.g. – oxygen(O), gold(Au), chlorine(Cl), aluminum (Al)

14. Metals – shiny, conduct heat and electricity well, and can be shaped e
* Metals – shiny, conduct heat and electricity well, and can be shaped e.g. – aluminum, gold, iron, lead, nickel
Gold
sodium
Nickel
Lead

15. *Non-metals – not shiny and do not conduct heat or electricity well e.g. – hydrogen, oxygen, sulfur, nitrogen

16. *Metalloids – has properties of both metals and non-metals
Examples – boron, silicon, arsenic

17. How do we identify elements?
*By their chemical symbol
Lead – Pb
Nitrogen - N
Sulfur - S

19. Pure Substances and Mixtures
Matter
Pure Substances Mixtures
Elements Compounds
Homogeneous Heterogeneous

20. e.g. – water (H2O) salt (NaCl) alcohol (C2H6O) sugar(C12H22O11)
Pure Substances
Compounds – substances made up of two or more elements through a chemical reaction, or change
e.g. – water (H2O) salt (NaCl) alcohol (C2H6O) sugar(C12H22O11)

21. *Compound: Sugar C12 O22 H11
Carbon C Oxygen O Hydrogen H

22. **Compound: Salt (NaCl)
(Sodium Na Chlorine Cl)

23. Compounds
Elements: Compounds:
Oxygen (O) Water (H2O)
Hydrogen (H)
Carbon (C) Sugar (C12H22O11)
Carbon dioxide (CO2)
Chlorine (Cl)
Sodium (Na) Salt (NaCl)
Iron (Fe) Rust (Fe2O2)

24. Bell Ringer (2/14)
Explain how you can tell the difference between an element and a compound.

25. Pure Substances and Mixtures
Essential Question:
How do we differentiate types of matter?

26. Pure Substances and Mixtures
Matter
Pure Substances Mixtures
Elements Compounds
Homogeneous Heterogeneous

27. Mixtures
*A combination of two or more substances that are physically combined

28. Mixtures
*Can be separated by physical changes

29. Pure Substances and Mixtures
Matter
Pure Substances Mixtures
Elements Compounds
Homogeneous Heterogeneous

30. evenly spread or mixed through the mixture
Mixtures
Homogeneous
*the substances are
evenly spread or mixed through
the mixture
*examples:
Chocolate milk
Kool-aid, soapy water

31. Mixtures
*Solutions: a mixture where one substance is dissolved in another substance (salt water, tea)

32. Pure Substances and Mixtures
Matter
Pure Substances Mixtures
Elements Compounds
Homogeneous Heterogeneous

33. *the substances are not mixed or spread evenly through the mixture
Mixtures
Heterogeneous
*the substances are not mixed or spread evenly through the mixture
*examples:
pizza, sandwich, soup

34. 3. Acids & Bases
*Acids – solution with pH level below 7
Examples – vinegar, milk, lemon juice
*Neutral – pH exactly 7 (pure water)
*Bases – solution with pH level above 7
Examples – baking soda, bleach, blood

35. Acidic (below 7)
Neutral (exactly 7)
Basic (above 7)

36. Lemon Juice (2) – Highly acidic Black Coffee (5) – Slightly acidic
Highly Slightly Slightly Highly
Acidic Acidic Basic Basic
Lemon Juice (2) – Highly acidic
Black Coffee (5) – Slightly acidic
Baking Soda (9) – Slightly basic
Bleach (13) – Highly basic

37. 3. Acids & Bases
**Salt – the chemical change when an acid solution is mixed with a base solution

38. Pure Substances and Mixtures
Matter
Pure Substances Mixtures
Elements Compounds
Homogenous Heterogeneous

39. Conclusion
Quick Write – Explain why salt is considered a pure substance but salt water is not