Do Now October 31, 2012

1. Do Now October 31, 2012

2. Complete the sentence with the correct answer. Write statement! • 1. The formation of precipitate is usually evidence of ? • the separation of a mixture • a chemical change • the formation of a mixture • a physical change. • 2. You can be certain that a change is a chemical change if • the change cannot be reversed. • New substances form. • Bubbles are produced. • A precipitate forms. • There is a color change. • 3. What action involves a chemical change? • making ice cubes • adding sugar to tea • cutting wrapping paper • baking a cake

3. Review test 1. What are the two physical properties used to separate mixtures? physical and chemical change melting and boiling points filtration and distillation compounds and elements 2. What three main groups can elements be divided into? compounds, elements, and mixtures metals, elements, and compounds metals, mixtures, and compounds metals, nonmetals, and metalloids 3. What is the smallest particle of an element? molecule atom element electron 4. What are the four classes of matter? elements, compounds, solutions, and suspensions elements, compounds, mixtures, and solutions atoms, molecules, electrons, neutrons elements, atoms, suspensions and compounds

4. 5. Matter is divided into what two classifications? • solids and liquids • elements and compounds • substances and mixtures • elements and mixtures • 6. Substances are divided into what two categories? • solids and liquids • elements and compounds • substances and mixtures • elements and mixtures • 7. Mixtures are divided into what two categories? • elements and compounds • heterogeneous and homogeneous • uniform and non-uniform • solutions and suspensions

5. 8. Homogeneous mixtures are: • uniform structure or composition throughout • tightly packed • loosely packed • the parts of the mixture are noticeably different from one another. • 9. Heterogeneous mixtures are: • uniform structure or composition throughout • tightly packed • loosely packed • the parts of the mixture are noticeably different from one another.

6. Match the following words with the correct terms: • 10. DensityA. ability of a solid to be hammered without shattering • 11. ViscosityB. used to test the purity of a substance or mass÷volume • 12. Malleability C. Temperature a substance changes from solid to liquid • 13. Conductivity D. ability to allow heat to flow • 14. Melting PointE. resistance to flow

7. Match the following prefixes with its equivalent: • A. 1012B. 10-2 C.10-3 D. 10-6 E. 10-9 • 15. Micro ______________ • 16. Centi ______________ • 17. Milli ______________ • 18. Nano ______________ • 19. Tera ______________

8. 20.Calculate the density of a material that has a mass of 52.457 g and a volume of 13.5 cm3. • 3.89 cm3 • 3.89g • 3.89g/ cm3 • 3.89cm • Sodium has a mass 17.55g. If the volume of the sodium is 9.0 cm3, what is the density? • 1.95 g/cm.3 • 2.95 g. • 1.99 g/cm.3 • 1.95 g. • 22.A screwdriver has a volume of 2.39 cubic centimeter. It also has the mass of 2.3 grams. What is the density? • 0.96g/cm3 • 0.89g/cm3 • 0.5cm3 • 0.96g