On Target? Do this on your Warm Up worksheet! Look at your data from yesterday. Can you put the three chemicals we looked at yesterday into any groupings, according to the properties you observed?

For today 1.Warmup 2.Properties Lab Objective: I can test properties of different substances in order to categorize these substances by recording accurate data throughout this lab activity.

Today: Testing all the other chemicals! Goggles needed! Work as a group!

DO NOT WRITE! How will you test the properties? Property Observation Appearance What it looks like Hardness Soft, powder, crystals, etc. Conductivity SOLID Conductivity meter: Low, Medium, High Soluble in water Put in water and stir: Yes, no, maybe? Conductivity in WATER Conductivity meter: Low, Medium, High Melting point Flame test: put over burner and look for when it melts Bond type NOT observable but the other properties are good clues.

WHEN FINSIHED… On each post-it note, write: Name of Substance (sugar, salt, Epsom salt) Name of property (Appearance, hardness, conductivity solid, soluble in water, conductivity in water) Your observation Then place on class data table whiteboard!

Data from scientists

Macroscopic Categories of Compounds New title in your notebook: Categorize (group by similarities) all tested compounds and make a chart that includes: 1.Name of category 2.List of compounds that belong in it 3.Description of the common properties.

Exit ticket Use your categories predict the conductivity of each. JUSTIFY your answer based on the data provided below. ?

Partner Read p What does it mean when something is an electrical conductor? Partner A Partner B Reads paragraph Listens, asks questions Both write down bolded words and agree on their meanings. SWITCH ROLES WITH EACH PARAGRAPH.

SUMMARY In a conductor, charged particles called ions (+ or – charge) are moving in an electrical current. For example, salt water must have ions moving between the prongs conducting electricity and so completing the circuit, lighting the LED lights. Sugar in water is a insulator because ions do not move so no electricity is conducted.

Explain your thinking… How did the reading change your thinking about your explanation of salt water conducting electricity? Look at your wipe board diagram from last week. REFLECT on your LEARNING. I used to think….Now I know…….

Now think smaller…. Sketch this picture in your notebook. See if you can label any of the parts.

EXPLORE: Particular Properties electron proton neutron negative(-) positive(+) neutral Particle (Atom)

Diagrams on pg Copy the picture of the conductivity meter in the solution on page 112. What solution do you think this is? What are the + ions and – ions? 2.Explain why the light is on in this picture. 3.Which figure on pg. 113 is water and which is baby oil? Use evidence to explain your answer.

Electroscope

Now you try it… Make a data table. MaterialPredictionObservation Plastic knife Glass rod Your choice

EXPLAIN Describe why the pin move when it is brought close to the plastic knife* * Use the words conduction, charge and repel or attract CONDUCTION = to move or transfer charge from one place to another. Metals are good conductors because they move charge from one place to another.

pg. 115 (1-5)

ANALOGY The water molecule is like a compass needle because….. Paper bits are like IONS because….

What about paper? How does a charges plastic knife interact with tiny paper confetti? Charged glass? What I sawWhat it means microscopically

What about water? Predict how a charged plastic knife will affect a stream of water. Does water have a charge? Does it attract or repel other charges objects? Look again at the diagram on pg. 113.

Sketch Diagrams to Explain Sketch a microscopic view of a stream of water falling past a charged plastic knife and a charged piece of glass. Use + and - symbols for charges.

Possible sketches

pg

Partner Read p Partner A Partner B Reads paragraph Listens, asks questions Both write down bolded words and agree on their meanings. SWITCH ROLES WITH EACH PARAGRAPH.

On Target? Which property will be the most useful in categorizing these chemicals?

On Target? Do all solids conduct electricity? Look at your data from Thursday for evidence. Identify what substances that conduct electricity have in common?

On Target? Give an example of two white crystals (from Friday) that have the same chemical and physical properties?

On Target? Use your categories from yesterday to explain how you would categorize baby oil, isopropyl alcohol, and vinegar. What data would you need to collect on each to help in categorizing them?

On Target? If we used the category: CONDUTIVITY in WATER Which substances would be considered conductors?

On Target? Use your notes from the reading to explain how copper metal allows electricity to pass through it.

On Target? Use what we learned yesterday about the atom to explain how copper metal allows electricity to pass through it.

On Target? What are IONS? What do IONS have to do with the light going on in salt water?

On Target? Does water have IONS? Does the water molecule have a charge? What about paper?

On Target? Distilled water doesn’t conduct electricity. Why might it act like a WEAK conductor in the class demonstration? TEST on FRIDAY!!