Tuesday, March 31 Do Now: What is the difference in homogeneous and heterogeneous mixtures? Give an example of each.
Objective: I can define atom, atomic mass, and atomic number. I can explain how the elements are arranged on the periodic table.
What are Elements? Use the Chemical Building Blocks Book Define: Elements Compounds
How many elements are there? Over 100 (currently 113) How are we able to arrange the elements so that they can be understood?
Dmitri Mendeleev Russian Scientist 1869 Noticed that the elements displayed interesting patterns He wrote out properties for each element and used those prop. to put them into a table.
Dmitri Mendeleev Recognized a pattern for the table: Phy/Chem properties Atomic mass Bonding power
Wednesday, April 1 Do Now: Write the answer only. How did Mendeleev set up the periodic table? Based upon atomic mass Chemical/physical properties Bonding power
Quick Homework Check: If you did not complete the homework please fill in a choice on your choice card. You are expected to finish this today during class before doing the task for today.
Copy: p Where is it located on periodic table? How reactive is this family? What are some physical properties of this family? Can you give a place in the world where we can find these?
Thursday, April 2 Do Now: Use the science book to define: Solute Solvent
Examples: The Solute is what is dissolved—it is the lesser amount. Ex. Sugar The Solvent is what does the dissolving… it is in the greater amount. Ex. of Solvent is Water
Quick Self-Assessment Quiz 1. Write your answers into your journal. Finished? Sit quietly (we will check these in a few minutes)
Alkali Metals
Metals: Physical Properties of Metals: Luster (shininess) Good conductors of heat and electricity High density (heavy for their size) High melting point Ductile (most metals can be drawn out into thin wires) Malleable (most metals can be hammered into thin sheets)
Metals continued:
Nonmetals Physical Properties of Nonmetals: No luster (dull appearance) Poor conductor of heat and electricity Brittle (breaks easily) Not ductile Not malleable Low density Low melting point
Chemical Properties of Nonmetals Tend to gain electrons Since metals tend to lose electrons and nonmetals tend to gain electrons, metals and nonmetals like to form compounds with each other. These compounds are called ionic compounds. When two or more nonmetals bond with each other, they form a covalent compound.
Metalloids Physical Properties of Metalloids: Solids Can be shiny or dull Ductile Malleable Conduct heat and electricity better than nonmetals but not as well as metals
Use the Science Book to Complete the Etch-A-Sketch Sketch a diagram/example Define the term **I will take these up before you leave…. These are not homework unless we are not using time wisely
Exit Slip: Who arranged the first periodic table of elements?
Periodic Table Color Coding: Use the crayons to color code the periodic table (p.80-81) Be sure to make a KEY