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Question 1 1. The half-life of a radioactive isotope is 22 years. How much of the isotope will remain from a 100.0 g sample after 110 years?
Question 2 2. A 5.0 kg cannonball is shot from a cannon 45 m above the ground with an initial horizontal velocity of 50. m/s. In the absense of air resistance, how long will it take for the cannon to hit the ground? (Assume g = 10. m/s2.)
Question 3 3. A car with a mass of 1000 kg traveling at a velocity of 15.0 m/s collides with a second car with a mass of 1100 kg at rest. If the two stick together, what is the velocity of the cars immediately after the collision?
Question 4 4. What is the pH of 5 mM KOH(aq)?
Question 5 5. Based on its position on the periodic table, which of the following elements has the greatest electronegativity?
Question 6 6. If 48.9 L of NH3, measured at 298 K and 1.00 atm, reacts with 2.00 mol of O2, what volume of NO2, measured at 298 K and 1.00 atm, is produced?
Question 7 7. Which of the following is the balanced equation for displacement reaction of potassium iodide and lead (II) nitrate?
Question 8 8. A 5.0 kg box is being pushed across the floor with 25 N of force. The box accelerates uniformly at a rate of 3.0 m/s2. What is the coefficient of kinetic friction? (Assume g = 10. m/s2.)
Question 9 9. Which of the following would be the best question to ask to address a common misconception regarding inertia?
Question 10 10. According to the Bohr model of the hydrogen atom, the energy En of an electron in the nth energy level of the atom is equal to -13.6/n2 eV. What is the energy of the photon emitted when an electron makes a transition from the n = 4 to the n = 2 level?
Question 11 11. A light ray passes from water (n = 1.33) into air (n = 1). Which of the following statements is true?
Question 12 12. When working with hazardous gases, which of the following is the most important protective equipment in the laboratory?
Question 13 13. What did the Rutherford model of the atom establish?
Question 14 14. Two charges are placed at a distance d from one another. What best describes what happens to the electrostatic force between them as the charges are moved further apart?
Question 15 15. 10.0 mL of 45.0°C water is mixed with 15.0 mL of 95.0°C water in a thermally insulated container. When thermal equilibrium is reached, what will the temperature of the water be?
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