Brain Teaser The smallest unit of any element is a(n) _________ . d. atom a. compound b. molecule c. mixture d. atom Brain Teaser Which of the following is a physical change? A. Melting ice cubes a. melting ice cubes b. burning paper c. rusting iron d. burning gasoline Brain Teaser See Demo to answer the following question! Sugar is made from these three substances! How are these substances different? Appearance, State, Solubility Brain Teaser Do you think sugar will form if you mix charcoal, oxygen, and hydrogen? Answer: NO Brain Teaser Write the definition of an element! There will be a Vocab Quiz today!!!! Start studying after your BT Brain Teaser Write the definition of an element! A substance that can not be separated or broken down into simpler substances by chemical means; all atoms of an element have the same atomic number. Brain Teaser If you add oil to water and shake the two liquids together, you will form a c. heterogeneous mixture. a. pure substance. b. miscible liquid. c. heterogeneous mixture. d. homogeneous mixture. Brain Teaser There are 6 specific properties for ALL matter, name them: 1. Color 2. Shape 3. Odor 4. Texture 5. Hardness 6. size Brain Teaser Find the density of the object: Given: m= 122g v= 2.5 cm3 SHOW ALL YOUR WORK! a. b. c. d. cm3 d. 48.8 130.6 0.0249 g/cm3 0.02cm3 48.8 g/cm3 3 g/cm D=m/v Brain Teaser • A block of wood 3.0cm on each side has a mass of 27g. What is the density of this block? a. b. c. d. g/cm3 10.0 1.0 g/cm3 9.0 g/cm3 0.33 g/cm3 b. 1.0 3 g/cm D=m/v Brain Teaser • The chemical symbol for sulfuric acid is H2SO4, how many atoms are contained in each molecule of sulfuric acid? a. b. c. d. 3 5 6 7 d. 7 Brain Teaser • List four properties that can be used to classify elements… Melting Point Boiling Point Density Reactivity Color Hardness Malleability Thermal Conductivity Solubility Brain Teaser • Ice floats in water because it is b. Less dense than water a. b. c. d. more dense than water. less dense than water. colder than water. warmer than water. Brain Teaser Explain in your own words “buoyant force” The upward force exerted on an object immersed in or floating on a fluid Write your KNOWNS & UNKNOWNS: Known: d = m/v d = _____ units m = _____ units v = _____ units unknown: ? d= m/v d= #units/#units d= # units box answer Chapter 2 Review pg. 60-62 Q’s & A’s 1-20, 30 Chapter 3 Review pg. 94 Q’s & A’s 1-2, 4, 6, 7, 10 • Turn in Ch. 2 Review • First –Read Lab • 2nd –State Your Hypothesis • 3rd – Begin Your Lab • When completed, clean up equipment! • Keep lab in folder/binder for class! • Reminder: TEST • TUESDAY!!!