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TAKS Problem. Sheets of ice containing mostly pure water can be formed by decreasing the temperature of saltwater. Which of these best describes this change? F) Chemical change G) Physical change H) Nuclear change I )Atomic change. ChemCatalyst.

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taks problem
TAKS Problem

Sheets of ice containing mostly pure water can be formed by decreasing the temperature of saltwater. Which of these best describes this change?

F) Chemical change

G) Physical change

H) Nuclear change

I )Atomic change

chemcatalyst
ChemCatalyst
  • What do you think happened to the copper powder in the copper cycle experiment when it was mixed with the Nitric Acid (H2NO3(aq))?

Model of Nitric Acid

what goes around comes around part ii
What Goes Around Comes Around (Part II)

Steps of the Copper Cycle.

Step 1

Colorless nitric acid is added to solid orange-brown copper powder, resulting in a blue-green solution, a brown gas, and liquid water.

HNO3(aq) is added to Cu(s), resulting in Cu(NO3)2 (aq) andNO2(g), andH2O(l).

step 2
Step 2

Clear colorless, sodium hydroxide solution is added to the blue-green solution, resulting in clumps of dark blue solid and clear, colorless sodium nitrate solution.

NaOH(aq) is added to Cu(NO3)2(aq), resulting in Cu(OH)2(s) and NaNO3(aq).

Copper Nitrate (aq)

step 3
Step 3

The dark blue clumps are heated, resulting in a black solid (sludge…poop looking stuff you guys poured through the filter paper…) and liquid water.

Cu(OH)2(s) is heated, resulting in CuO(s), and H2O(l).

Copper Oxide (s)

step 4
Step 4

Clear, colorless sulfuric acid is added to the black solid, resulting in a clear blue solution and liquid water.

H2SO4(aq) is added to CuO(s), resulting in CuSO4(aq), and H2O(l).

Model of Sulfuric Acid

step 5
Step 5

Solid, silver gray zinc is added to the clear blue solution, resulting in a brownish powder, and clear, colorless zinc sulfate solution.

Zn(s) is added to CuSO4(aq), resulting in Cu(s), and ZnSO4(aq).

Zinc Sulfate (solid)

making sense 10 min
Making Sense (10 min)
  • No Talking…just writing.
  • Describe what happened to the copper throughout this experiment. Be specific…
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