Opening Assignment Which of the following is an example of a physical change ? A. lighting a match B. breaking a glass C. burning of gasoline D. rusting.

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Presentation transcript:

Opening Assignment Which of the following is an example of a physical change ? A. lighting a match B. breaking a glass C. burning of gasoline D. rusting of iron WHY? __________________

Physical or Chemical Change? Dissolving salt in water?

Review – Describing matter Foldable…..

Elements compounds and mixtures!

Square 1 Write down as many examples of elements that you can! Its timed!!!!! Draw a cube of aluminum… What would it look like if you put on your molecular goggles?

4. What is the smallest particle of the element gold (Au) that can still be classified as gold? A. atom B. molecule C. neutron D. proton 5. What is the smallest unit of a compound that still can be classified as a compound? A. atom B. molecule C. neutron D. proton

Square 2 Draw a compound What is the chemical formula for the compound?

7. A scientist combines oxygen and hydrogen to form water 7. A scientist combines oxygen and hydrogen to form water. This combination illustrates that water is A. an atom B. an element c. a mixture d. a compound 8. Which of the following is formed when two elements combine chemically A. An atom B. a compound C. an electron D. a mixture

Square 3 Draw the smallest unit of the compound water. Label the atoms. What is this called?

What is the smallest unit of a chemical compound that still has the properties of that compound? nucleus molecule atom element

Square 4 Air is a mixture….. Draw a mixture (of air!) Label the atoms and molecules

Square 5 Write down 2 examples pure substances. Which of these is a pure substance?

Square 6 What is volume? What is the volume of this cube? If it had a mass of 35 grams what would be its density?

Square

Density Which is more dense?

Formula for density What is the density of an object that has a mass of 10 grams and a volume of 5 cm3

Which of the following units best represents the density of an object? kg hr m/s2 g/cm3