Warm-Up 4/16/14

1. Warm-Up 4/16/14 • Observethe set of jars at your table. Do not open the jars! • “Think like a Scientist”and describe the differences and similarities you observe between the contents of each jar.

2. Elements, Compounds and MixturesGuiding Question #4 and #7 Science/7th Grade

3. Our focus this week is to be able to identify and describe the difference between an element, a compound and a mixture. • Which jar do you think contains an Element? Mixture? Compound? You must support your answer with evidence.

4. So What are They? • We use elements, compounds and mixtures every day. • Discuss with your table what you think the differences and similarities are between elements, compounds and mixtures.

5. Reading with Pen-in-Hand • Read the article your teacher has given you. • You need to annotate as you read – you are looking for definitions and examples for element, compound, mixture • In your notebook, record the following information- a) Definitions for element, compound, mixture b) One examples for each one.

6. Elements • Elements have only one type of atom. It is also called a pure substance (it can’t be broken down into a simpler form). • Example – anything on the Periodic Table of Elements is an element. If it is not listed on the table, it is not an element. It is a compound or a mixture

7. Compounds • Compound: When two or more elements join together by a chemical bond. A compound always contains the same content and amount of each element. • Example: Water- H2O Iron oxide “rust” – Fe2O3

8. Mixtures • A combination of two or more atoms or molecules that are not chemically combined. What is present in the mixture and the amount may vary. You can separate a mixture. • Example – ~Air is a mixture of different gases (N2, Ar, O2, CO2, dust, sometimes smoke, etc. ~Milk.

9. Lab: Identifying Elements, Compounds, Mixtures and their Uses At each station record the following in your notebook- • Write down the title of the station • Read the information provided and make observations • Determine if the substance is an element, compound or mixture…and support with evidence! • Give 2 uses of the substance in your daily life REMINDERS… • Work cooperatively with your tablemates • Be “active” learners –use your thinking strategies • Stay at your table until time has been give to move. ~ 4’ • No miss use of lab materials or horseplay!

10. Reflection Questions • Based on the activities completed in class today on elements, compounds and mixtures, choose one of the following science reflection questions and write your response in your notebook. • If Mom or Dad asked you tonight what you learned in science today…What would you say? • An “AHA!” moment I had is….. • Use 3-5 complete sentences and remember to use your science vocabulary

11. Elements, Compounds, Mixtures Lesson 2

12. Brain Pop: Compounds and Mixtures

13. Rotation Lab Discussion

14. Station #1: Sweet Soda • Soda is a mixture while sugar is a compound. • If you evaporate the water away, you are left with soda’s other components • Common table sugar always has the formula of C12H22O11 which makes it a compound

15. Station 2: Good Morning • Coffee is a mixture, you can separate it by letting the water evaporate • Orange juice is also a mixture for the same reason that coffee is. • Water is a compound. It’s formula is always H2O

16. Station 3: Salt or Pepper? • Salt is a compound with the formula NaCl. • Pepper is a mixture, each pepper granule has a different atomic structure than the one next to it. If you look closely, you can see the difference.

17. Station 4: Around the House • Copper is an element, it can be found on the periodic table • Steel is a mixture (called an alloy when metals are mixed). Can be separated by melting. • Does anyone know what metals make up steel? • Iron, carbon and sometimes a third metal such as manganese, chromium or vanadium

18. Station 5: Cooking for Fun • Pure rubber is a compound of C5H8, but now there are so many other additives (that differ in each product made) that today’s utensils are a mixture. • Aluminum is an element, it can be found on the periodic table.

19. Station 6: Still Cooking • Cooking oils are usually extracted from plants (corn, olives). Since each cell within the plant has a different combination of atoms, it is a mixture. • Flour is a mixture made from grains (wheat), so the reason is the same as the oil.

20. Station 7: Coins • Canadian nickels were made of nickel until about 1988. Nickel is an element. • American nickels have been made of an alloy (copper and nickel) for decades. It is a mixture • To test it: nickel is magnetic, the alloy of today’s nickels is NOT magnetic

21. Station 8: Silver, Bronze and Gold • The silver and gold medals are elements. • Bronze is an alloy mixture of copper and tin

22. Elements, Compounds, MixturesCheck for Understanding • In your science notebook create a 3 column graphic organizer. The heading for the first column is ELEMENT, the second is COMPOUND, and the last isMIXTURE. • Review the information from the notes you just took in class. Then, using your background knowledge and inferring skills, place the following examples in the correct column.

23. Elements, Compounds, MixturesCheck for Understanding • Table salt (NaCl) • Oxygen (02) • Nitrogen (N2) • Kool aid • Hydrogen (H2) • Carbon dioxide (CO2) • Vinegar (C2H4O2) • Salt water • Gold (Au) • Pizza toppings • Sugar and sand • Water (H2O)