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    Why do my legs hurt after sitting and bouncing on an exercise ball?

    I just got an exercise ball and have been using it to sit at my desk and work and I have noticed that the back of my thighs are sore. Is that normal? Im not trying to lose weight, just get more flexible, so I don't need no ads. Thank you.
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    How do you solve this chemistry question?

    What is the theoretical yield in grams TiO2 if 8.00 g of TiCl4 react with 1.55 g of H2O? The equation for the reaction is TiCl4 + 2 H2O TiO2 + 4HCl.
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    How do you solve this chemistry problem?

    According to the reaction 2 Al + Fe2O3 Al2O3 + 2 Fe, if 3.50 g Al is combined with 9.00 g Fe2O3, what is the limiting reactant?
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    I need help on knowing how to solve this chemistry question?

    A student collected the following temperature solubility data for ammonium chloride (NH4Cl) dissolved in water. Calculate the solubility of NH4CL, in grams of NH4Cl per 100 ML water. mass of sample 2.33 g The total volume added is 3.00 mL and the saturation temperature is 98.0 °C
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    I need help solving this chemistry problem. At 25 degees celcius, 10.0181 g of an

    unknown liquid was found to? have a volume of 6.75 mL. What is the density of the liquid?
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    I need help with this chemistry question. A gas tank hold 42kg of gas. When it

    burns, 168kg of oxygen are? consumed and carbon dioxide and water are produced. What is the total combined mass of carbon dioxide and water. Im not sure how to get the answer. please help
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