<ul><li>Chemistry Assessment </li></ul><ul><li>Eligible Texas Essential </li></ul><ul><li>Knowledge and Skills </li></ul>T...
<ul><li>Readiness standards   have the following characteristics. </li></ul><ul><li>They are essential for success in the ...
<ul><li>Supporting standards   have the following characteristics. </li></ul><ul><li>Although introduced in the current gr...
<ul><li>TEA is implementing a number of changes that should serve to test knowledge and skills in a deeper way. </li></ul>...
 
Energy
 
Prior knowledge? <ul><li>Units of mass and temperature </li></ul><ul><li>Classify changes as physical or chemical </li></u...
Engage Hot and cold packs Freeze a beaker to a board Dissolve CaCl 2  in H 2 O
What should be taught? <ul><li>Forms of energy (kinetic, potential, chemical, thermal) </li></ul><ul><li>Heat transfer (co...
What will constitute mastery? <ul><li>The student should be able to: </li></ul><ul><li>Classify a change as endothermic or...
CH 4 +  2 O 2      2 H 2 O  +  CO 2 +  heat Is this reaction exothermic or endothermic? reactants     products Add the e...
An 85.0 g sample of brass is heated to 95.0ºC and placed in 100.0 g of water at 6.5ºC.  The water reaches thermal equilibr...
Taught in matter unit x y Label the areas on the phase diagram. Describe the changes that occur as you move from point x t...
Calculate the amount of heat, in joules, required to convert 180 grams of water at 10.0  C to steam at 105.0   C.  speci...
<ul><li>Type of reaction? </li></ul><ul><ul><li>endothermic </li></ul></ul><ul><ul><li>exothermic </li></ul></ul><ul><li>D...
<ul><li>Two containers of water are at 20°C initially.  One contains 50 mL and the other 100 mL.  They are each heated wit...
<ul><li>Calculate the ∆H for the reaction. </li></ul><ul><li>CaCO 3  (s)      CaO (s)  +  CO 2 (g) </li></ul><ul><ul><li>...
Upcoming SlideShare
Loading in …5
×

Energy

609 views
561 views

Published on

Presented by Karen Compton, Jane Smith and Claudia Wallace in the ACT2 stand at CAST2010 in Houston, Texas

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
609
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
8
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Energy

  1. 1. <ul><li>Chemistry Assessment </li></ul><ul><li>Eligible Texas Essential </li></ul><ul><li>Knowledge and Skills </li></ul>Texas Education Agency Student Assessment Division September 2010
  2. 2. <ul><li>Readiness standards have the following characteristics. </li></ul><ul><li>They are essential for success in the current grade or course. </li></ul><ul><li>They are important for preparedness for the next grade or course. </li></ul><ul><li>They support college and career readiness. </li></ul><ul><li>They necessitate in-depth instruction. </li></ul><ul><li>They address broad and deep ideas. </li></ul>Texas Education Agency Student Assessment Division September 2010
  3. 3. <ul><li>Supporting standards have the following characteristics. </li></ul><ul><li>Although introduced in the current grade or course, they may be emphasized in a subsequent year. </li></ul><ul><li>Although reinforced in the current grade or course, they may be emphasized in a previous year. </li></ul><ul><li>They play a role in preparing students for the next grade or course but not a central role. </li></ul><ul><li>They address more narrowly defined ideas. </li></ul>Texas Education Agency Student Assessment Division September 2010
  4. 4. <ul><li>TEA is implementing a number of changes that should serve to test knowledge and skills in a deeper way. </li></ul><ul><li>Tests will contain a greater number of items that have a higher cognitive complexity level . </li></ul><ul><li>Items will be developed to more closely match the cognitive complexity level evident in the TEKS . </li></ul><ul><li>In science, process skills will be assessed in context , not in isolation, which will allow for a more integrated and authentic assessment of these content area. </li></ul><ul><li>In science, the number of open-ended (griddable) items will increase to allow students more opportunity to derive an answer independently. </li></ul>Texas Education Agency Student Assessment Division September 2010
  5. 6. Energy
  6. 8. Prior knowledge? <ul><li>Units of mass and temperature </li></ul><ul><li>Classify changes as physical or chemical </li></ul><ul><li>Heat transfer </li></ul><ul><ul><ul><li>conduction, convection, radiation </li></ul></ul></ul>
  7. 9. Engage Hot and cold packs Freeze a beaker to a board Dissolve CaCl 2 in H 2 O
  8. 10. What should be taught? <ul><li>Forms of energy (kinetic, potential, chemical, thermal) </li></ul><ul><li>Heat transfer (conduction, convection, radiation) </li></ul><ul><li>Endothermic and exothermic </li></ul><ul><li>Energy in physical changes </li></ul><ul><ul><li>Heating curves/phase diagrams </li></ul></ul><ul><ul><ul><li>q =mc∆T and q = mc </li></ul></ul></ul><ul><ul><li>Calorimetry </li></ul></ul><ul><ul><li> (heat lost = heat gained) </li></ul></ul><ul><ul><li>heat of solution </li></ul></ul><ul><li>Energy in chemical changes using energy diagrams and table values </li></ul><ul><li>∆ H = Σ ∆H products - Σ ∆H reactants </li></ul><ul><li>Calorimetry (energy of reaction) </li></ul>
  9. 11. What will constitute mastery? <ul><li>The student should be able to: </li></ul><ul><li>Classify a change as endothermic or exothermic in both physical and chemical changes </li></ul><ul><li>Calculate q = mc∆T for both physical and chemical processes </li></ul><ul><li>Describe heat transfer in a situation such as heating a pot of water on the stove </li></ul><ul><li>Write a balanced chemical equation including the ∆H value and identify the reaction as endothermic or exothermic </li></ul><ul><li>Significance of signs for ∆H </li></ul><ul><li>Calculate ∆H from table values </li></ul>
  10. 12. CH 4 + 2 O 2  2 H 2 O + CO 2 + heat Is this reaction exothermic or endothermic? reactants  products Add the energy component if the reaction is endothermic Add the energy component if the reaction is exdothermic
  11. 13. An 85.0 g sample of brass is heated to 95.0ºC and placed in 100.0 g of water at 6.5ºC. The water reaches thermal equilibrium at 15.7ºC. What is the specific heat of this brass? A piece of copper alloy with a mass of 85.0 g is heated from 30.0 o C to 45.0 o C. In the process, it absorbs 523.0 joules of heat energy. What is the specific heat of the copper alloy? Straight specific heat calculation q = mc∆T Heat lost = heat gained calculation q = mc∆T
  12. 14. Taught in matter unit x y Label the areas on the phase diagram. Describe the changes that occur as you move from point x to y in both directions. What is the normal melting point (boiling point) of this substance?
  13. 15. Calculate the amount of heat, in joules, required to convert 180 grams of water at 10.0  C to steam at 105.0  C. specific heat of water = 4.18 J/g  C; specific heat of steam = 2.03 J/g  C; heat of vaporization of water = 2.26 x 10 3 J/g. Describe the energy flow in areas B  C E  D using the terms endothermic and exothermic or what sign would be given to q in these areas?
  14. 16. <ul><li>Type of reaction? </li></ul><ul><ul><li>endothermic </li></ul></ul><ul><ul><li>exothermic </li></ul></ul><ul><li>Describe the energy flow. </li></ul><ul><li>Energy is released to the surroundings </li></ul><ul><li>Energy is absorbed from the surroundings </li></ul><ul><li>Describe the temperature changes resulting for the reaction depicted in the graph. </li></ul><ul><li>Temperature of the surroundings increases. </li></ul><ul><li>Temperature of the surroundings decreases. </li></ul><ul><li>Temperature of the system increases. </li></ul><ul><li>Temperature of the system decreases. </li></ul>
  15. 17. <ul><li>Two containers of water are at 20°C initially. One contains 50 mL and the other 100 mL. They are each heated with the same source of heat for the same amount of time. If the final temperature of the 50 mL sample is 50°C what would be the final temperature of the 100 mL sample? </li></ul><ul><li>25° C B) 35° C C) 50° C D) 90° C E) 100 °C </li></ul><ul><li>Explain your logic. </li></ul>Conceptual question
  16. 18. <ul><li>Calculate the ∆H for the reaction. </li></ul><ul><li>CaCO 3 (s)  CaO (s) + CO 2 (g) </li></ul><ul><ul><li>∆ H f CaO (s) = -634.9 kJ/mol </li></ul></ul><ul><ul><li>∆ H f CO 2 (g) = -393.5 kJ/mol </li></ul></ul>

×