1. AIM: How do elements interact chemically to produces new substances? (PSKI#3) 5/13/13 DO NOW: 1.Put your corrected and signed ILS Test #2 in the basket 2.Pick up today’s quiz and finish it HOMEWORK: 1.Get your progress report signed by your parent 2.Study for tomorrow’s quiz on PSKI#3 3.Read p. 81-85 in your PS ILS REVIEW BOOK. 4.Answer Questions #43- 82 on p. 95-104 in your ILS PS Review Book.

2. What is the smallest unit of matter that still contains the properties of matter? atoms Describe the charges of a proton, neutron, & electron. Proton = “+” charge Neutron = “0” charge Electron = “-” charge Where are the protons, neutrons & electrons located in an atom? Nucleus – protons & neutrons Outside the nucleus - electrons Define element. Matter made up of only one kind of matter Define molecule. A molecule is made up of atoms that are chemically bonded together

3. How do we determine the number of protons in an element from the periodic table? # of protons = Atomic # How do we determine the number of electrons from the periodic table? # of electrons = Atomic # # of electrons = # of protons How do we determine the number of neutrons from the periodic table? # of neutrons = Atomic Mass – Atomic number (# of protons)

4. What is a physical change? Give an example. A change that does not produce a new substance and can be undone. Example - phase change, tearing into small pieces What is a chemical change? Give an example. Change that produces a new substance Examples- burning, rusting

5. What is a mixture? Made up of two or more materials mixed together but not chemically combined. How can you separate a mixture of water & sand? Pour off in a strainer How can you separate a mixture of salt and water? Boil & evaporate it How can you separate a mixture of sand and iron filings? Use a magnet

6. What is a compound? Two or more elements chemically combined. How do you determine the number of atoms that make up a molecule of water? The subscript next to the chemical symbol H 2 O Identify the number of atoms of carbon and oxygen are found in carbon dioxide. CO 2 = 2 carbon atoms & 1 oxygen atom State the law of conservation of mass. Matter cannot be created or destroyed – it can only be rearranged

7. ILS Questions Which activity is an example of a chemical change? (1) dissolving table salt in water (2) hammering aluminum into thin sheets (3) melting gold to make jewelry (4) burning wood to produce ashes The diagram shows an aluminum can before and after it was crushed. Explain why crushing the aluminum can is an example of a physical change and not a chemical change.

8. ILS Question A student performed an experiment in which 10 mL of a strong acid was placed on a sample of limestone. Bubbles formed where the acid touched the limestone. After 20 minutes, the bubbling stopped and the surface of the limestone appeared unchanged. 1.Identify one observation that shows a chemical reaction occurred between the acid and the limestone. 2.Explain why limestone buildings are weathered by acid rain even though the limestone sample in this experiment did not appear to be changed by the strong acid.

9. ILS Questions Identify one element that has chemical properties similar to the chemical properties of fluorine. The chemical symbols of four different elements are listed below. Cd Cu Br P In which group of the Periodic Table of the Elements are the noble gases located?

10. What is the atomic number of Aluminum? What is the atomic mass of Phosphorus? How many protons, electrons, & neutrons are found in Fluorine? Identify one element that is a metalloid. ILS Questions

11. The diagram below shows the arrangement of atoms and the chemical composition of a water molecule. The table shows common elements and their chemical symbols. What two elements make up the water molecule? ILS Questions