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Chemistry

Chemistry. What are the horizontal rows on the Periodic Table called?. Periods. How do we determine an elements reactivity?. The group number (with the A). What could you tell me about this element based on this picture?. The element is Silicon (Si) There are 4 Valence Electrons (Group 4A)

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Chemistry

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  1. Chemistry

  2. What are the horizontal rows on the Periodic Table called? Periods

  3. How do we determine an elements reactivity? The group number (with the A)

  4. What could you tell me about this element based on this picture? The element is Silicon (Si) There are 4 Valence Electrons (Group 4A) There are 4 energy levels (Period 4)

  5. What are the vertical columns called on the Periodic Table? Group/Family

  6. What element will react with Rubidium (Rb)? Any element in group 7A

  7. What subatomic particles go inside of the nucleus of an atom? Protons & Neutrons

  8. Where are the metals located on the Periodic Table? Left side of the zig-zag line

  9. What are 3 characteristics of metals? Conductors Malleable High Reactivity

  10. Identify the element pictured and determine the number of neutrons this element has Element = Silicon (Si) Neutrons: 28-14= 14

  11. How many valence electrons and energy levels does Chlorine (Cl) have? 7 Valence Electrons 3 Energy levels

  12. Balance the following chemical equation:_____Al + ___Br2___Al2Br6 2 3

  13. Balance the following chemical equation:____CH4 + ____O2 ____CO2 + ____H2O 2 2

  14. When you have a balanced equation, as shown below, how does the mass of the reactants compare to the mass of the products?2Al + 3Br2 Al2Br6 They’re equal!

  15. In the following equation, how many atoms are combined to form 2 molecules of Sodium Chloride (NaCl)?2Na + Cl2 2NaCl On the reactant side there are 2 Na & 2 Cl so…..4

  16. What are the 5 signs that a chemical change has occurred? Color Change New Substance Temperature Change Bubbles (gas) Fire

  17. Chemical or physical change: glass being broken Physical b/c the shape of the glass is the only thing changing

  18. When vinegar and baking soda are combined, bubbles begin to form. Bubbles are evidence of a chemical reaction because they –A pop when they are touched.B show that a gas is forming.C form at a fast rate.D are generally transparent. B

  19. What is an endothermic reaction? A reaction that makes something feel COLD

  20. What is an exothermic reaction? A reaction that makes an object HOT

  21. If bubbles appear when you mix 2 chemicals, is this a sign of a chemical or physical change? What do the bubbles represent? Chemical – bubbles represent the formation of a gas

  22. When I mix 2 liquids together a solid forms. Is this solid an example of a chemical or physical change? What is this solid called? Chemical change – the solid is a precipitate

  23. Four students performed four different investigations by combining different substances. Their results are shown in the table provided.In which experiment are new substances being formed? Experiment 1

  24. Hydrogen peroxide breaks down to form water and oxygen gas.When this reaction occurred, the following observations were made:I - The mass of the solution remains the same.II - Phase changes are observed. III - The color of the solution remains clear. IV - The temperature of the solution increases. Which observation is evidence that a chemical change has occurred? Observation IV

  25. What do we need to do to Channing to get him to accelerate? Apply an unbalanced force

  26. Skyler threw the football 17 yards in 37 seconds. At what speed was the football traveling? 0.46 yd/sec.

  27. Brandon used a triple beam balance and determined that the mass of the rock shown was 274g. Use the imagebelow to determine the volume? D=27.4 g/mL

  28. What energy transformations take place when a battery-operated radio is in use? Chemical  Electrical  Sound

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