AIM: How do elements interact chemically to produces new substances? (PSKI#3)

5/13/13DO 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 parent2. Study for tomorrow’s

quiz on PSKI#33. 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.

What is the smallest unit of matter that still contains the properties of matter? atomsDescribe the charges of a proton, neutron, & electron. Proton = “+” charge Neutron = “0” charge Electron = “-” chargeWhere are the protons, neutrons & electrons located in an atom? Nucleus – protons & neutrons Outside the nucleus - electronsDefine element. Matter made up of only one kind of

matterDefine molecule. A molecule is made up of atoms

that are chemically bonded together

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)

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 substanceExamples- burning,

rusting

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 strainerHow can you separate a mixture of salt and water?Boil & evaporate itHow can you separate a mixture of sand and iron filings?Use a magnet

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 H2O

Identify the number of atoms of carbon and oxygen are found in carbon dioxide. CO2 = 2 carbon atoms & 1 oxygen

atomState the law of conservation of mass. Matter cannot be created or

destroyed – it can only be rearranged

ILS QuestionsWhich 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.

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.

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?

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

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