Tag Archives: table

Step2 WaterWheel Activity Play Table

Step2 WaterWheel Activity Play Table

  • Wide receptacle funnels water over spinning wheel, into inner and outer harbors
  • Molded-in sections create moats, lakes, canals, and harbors
  • Elevated design makes play accessible while keeping children out of the dirt and mud
  • 4-piece accessory set with boats, cup, and water wheel tower

The falling water action from this Waterwheel Play Table encourages creative exploration with cause and effect learning. This imaginative water play center encourages hours of outdoor fun. Pour water into the wide funnel, and activate the water wheel which then spills into the inner and outer harbors. Two molded-in sections function as canals, boats, lakes, harbors and more. An elevated design keeps water at toddler level and also keeps ground dirt clear of water and mud from forming on children’s feet. It accommodates up to three children to encourage group play. Two built-in drain plugs allow for easy water removal. The four piece accessory set includes: one cup, two sailboats, and one water wheel tower. Features decorative molded-in fish designs on legs. It can holds up to four gallons of water.

List Price: $ 42.99

Price: [wpramaprice asin="B000641DPQ"]

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Tabulated values of chemical thermodynamic properties seem inconsistent. What am I misunderstanding?

The table in the back of my wife’s chemistry textbook tabulates values of the standard enthalpy of formation delta-Hf0, the standard entropy S0, and the standard free energy of formation delta-Gf0, for a wide variety of elements and compounds, all evaluated at 25C. As I understand it, they should be connected by the relationship

delta-Gf0 = delta-Hf0 – T*S0

They aren’t. For instance, for liquid water, it gave

delta-Hf0 = -286 kJ/mole
S0 = 69.96 J/(mole K)
delta-Gf0 = -237.2 kJ/mole

25C corresponds to T = 298.16 K , so by my calculations detla-Gf0 should be

-286 kJ/mole – 298.16 K * (69.96 J/(mole K) / 1000 (kJ/J)) = -307 kJ/mole

None of the entries in the table work out as I expected, which rules out a typo. I’ve checked with other sources, and they all agree tolerably well with the values tabulated in this textbook. What am I misunderstanding?

Using a table of standard reduction potentials calculate the standard cell potential in volts?

2I − + Br2 = I2 + 2Br−

Calculate the standard free energy change in kJ/mol for the above cell reaction

3) Using a table of standard reduction potentials, calculate (A) the standard cell potential?

(electromotive force) in volts, and (B) the standard free energy change in kJ/mol, for the following cell reaction:

2Ag+ + Zn = 2Ag + Zn2+

Using a table of standard reduction potentials calculate the standard cell potential (electromotive force)?

Using a table of standard reduction potentials calculate the standard cell potential (electromotive force) in volts

for the following cell.

Fe + F2 = Fe2+ + 2F−

2) Calculate the standard free energy change in kJ/mol for the above cell reaction.

Enter a numeric answer only