reference table...T

 

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Test Your Understanding of Table T

 

Test Your Understanding of Table T

 

Density

  1. Calculate m in terms of d and v.

  2. Calculate v in terms of m and d.

  3. What is the d of an object with a mass of 102.0 g and a volume of 10 cm3?

  4. What happened to the d of an object whose v decreases?

  5. A nail (m = 2 g and V = 0.5 cm3) is cut in 2 pieces. Explain why the d of each half remains the same as the original nail.

  6. An object has a mass of 23 g and a density of 10 g/cm3 what is its volume?

  7. What is the density of aluminum?

Mole Calculations

  1. What is the number of mole in a sample of 45g of H2O?

  2. What is the number of mole in a sample of 6g of NH3?

  3. What is the mass of 2 moles of H2O2?

  4. What is the mass of 4 moles of C2H2?

Percent Error

  1. Can the Percent Error be less than 0?

  2. What is the difference between the measured value and the accepted value if the Percent Error is 100?

  3. A Student calculates the density of iron at STP to be 8.956 g/cm3. What is the Percent Error?

  4. Why do we have to calculate the Percent Error in scientific experiments?

  5. In an experiment a student calculates the atomic radius for iridium. The % error of the calculation is 23 %. What is the experimental value?

Percent Composition

  1. What is the percent composition by mass of H in H2O2?

  2. What is the percent composition by mass of all the elements in (NH4)3PO4?

  3. What is the percent, by mass, of water in MgSO4.2H2O?

  4. How many grams of O can be produced from the decomposition of 50g of H2O?

  5. How much phosphorus can be recovered from 25g of (NH4)3PO4?

  6. How much potassium can be produced from 125g of KMnO4?

Concentration

  1. Describe the laboratory procedure to make a 2 M NaCl(aq) solution.

  2. What is the molarity of a solution of KOH if 1000 ml of the solution contains 11.2 grams of KOH?

  3. How many moles of KOH are contained in 250 mL of 2.0 M solution of KaOH?

  4. A 40.0 milliliter sample of 0.50 M HCl is diluted with water to a volume of 100. milliliters. What is the new concentration of the solution?

  5. What is the concentration in parts per millions if a 500 g solution of copper (II) sulfate contains 5 mg of copper (II) sulfate?

Combined Gas Law

  1. Given the formula for the combine gas law, express every single term in term of the other terms.

  2. What will be the new formula if temperature is constant?

    1. What is the name of this formula?

    2. Draw a line graph representing the relationship.

    3. Explain in a sentence the result of the line graph.

    4. Find an example to illustrate your findings.

  3. What will be the formula if pressure is constant?

    1. What is the name of this formula?

    2. Draw a line graph representing the relationship.

    3. Explain in a sentence the result of the line graph.

    4. Find an example to illustrate your findings.

  4. What temperature scale has to be used for temperature?

  5. Do any specific scales have to be used for pressure and volume?

  6. At STP, a sample of hydrogen gas has a volume of 10 L. If the temperature is double and the pressure is double, what is the new volume of the gas sample?

  7. At STP, a sample of helium gas has a volume of 5 L. If the temperature is quadruple and the pressure is triple, what is the new volume of the gas sample?

Titration

  1. What is a titration?

  2. How many milliliters of 0.50 M NaOH are required to exactly neutralize 20.0 milliliters of 0.20 M HCl?

  3. If 100. milliliters of a 3.0 M solution of HCl is exactly neutralized by 80. milliliters of NaOH, what is the molarity of the NaOH solution?

  4. What is the molarity of an HNO3 solution if 10.0 milliliters of 0.40 M LiOH is required to exactly neutralize 200 milliliters of the HNO3 solution?

  5. How many milliliters of 1.0 M HCl are needed to exactly neutralize 50. milliliters of 0.5 M KOH?

  6. Describe the laboratory procedure of titration.

Heat

  1. What is the definition of specific heat capacity?

  2. How is the heat of fusion defined?

  3. What is the definition of heat of vaporization?

  4. Write the formula for change in temperature.

  5. What is the specific heat capacity of water?

  6. The temperature of 10 g of water has increased by 10 K, how much heat was absorbed?

  7. After an experiment using 2 g of water, 20 J was released in the surrounding and the final temperature is 257 K, what was the original temperature of the water?

  8. What is the value for the heat of fusion for water in J/g?

  9. What is the value for the heat of vaporization in J/g?

  10. How many Joules are required to melt 1000 g of water?

  11. How many Joules are needed to vaporize 10 g of water?

Temperature

  1. Convert the followings: 0oC to K, 373 K to oC, 35oC to K

  2. What is the difference in degree Celsius and in Kelvin between the freezing and the boiling point of water?

  3. How is temperature defined?

  4. Is 1 K equal to 1oC? Why?

Radioactive Decay

  1. What is the concept of half-life?

  2. What is the concept of Radioactive Decay?

  3. What is the value of (1/2)0 ?

  4. What is the value of (1/2)1 ?

  5. When is t/T = 0?

  6. When is t/T = 1?

  7. After how many half-life periods an original sample of a radioisotope will decreased by ¼?

  8. What is the fraction remaining after 5 half-lives have elapsed?

  9. What is the half-life of nitrogen-16?

  10. A sample of uranium-238 is stored in a safe place, what is the amount remaining after 1.35 x 1010 years and what kind of decay particle are given throughout the years?

  11. A sample of an unknown radioisotope has taken 2 weeks and 2/5 of a day to have 1/64 of the original sample remaining. What is this radioisotope?

  12. If the initial mass of a sample of cesium-137 is 1.00 g, how much will remain after 151 years?

  13. Consider a sample of fossilized wood that originally contained 24 g of carbon-14. It now contains 1.5 g of carbon-14. How old is the sample?

  14. A 64 g sample of germanium-66 is left undisturbed for 12.5 hours. At the end of that period, only 2.0 g remain. What is the half-life of this material?

  15. If a pellet of cobalt-60 that has been in storage for 26.5 years contains 14.5 g of cobalt-60, how much of this radioisotope was present when the pellet was put into storage?

  16. How long will it take for 1.00 gram of strontium-90 to decay to 125 mg?

  17. A patient receives iodine-131 as a medical treatment on Sunday October 18 at 8:00:00 am.
    On what day, date, hour, minute, and second will only 1/8 of the original sample still be radioactive?

 

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