Solid state Questions

11. What is radioactivity?
12. What is half-life?
after three half-lives?
after four half-lives
?
13. If we start with 400 atoms of a radioactive substance, how many would remain after one half-life?
after two half-lives?
14. A paleontologist discovered fo

Physical Chemistry

Solid state Solutions

11. What is radioactivity? 12. What is half-life? after three half-lives? after four half-lives ? 13. If we start with 400 atoms of a radioactive substance, how many would remain after one half-life? after two half-lives? 14. A paleontologist discovered fossil remains of ancestral mammal, and in order to have basis of comparison to other ancestral mammals, he needed the age of the fossil. The carbon-14 analysis indicates that only half of the original amount is present. How old is this fossil? 15. The half-life of hydrogen-3 is 12.3 years. Given 100 g of hydrogen-3, how many grams will be left after 5 half-lives? 16. A patient is administered 20 mg of iodine-131. How much of this isotope will remain in the body after 40 days if the half-life for iodine-131 is 8 days? 17. The mass of cobalt-60 in a sample is found to have decreased from 0.8 g to 0.2 g in a period of 10.5 years. From this info, calculate the half-life of cobalt-60 18. The three most common states of matter are & 19. The kinetic theory states that the higher the temperature, the (faster / slower) the particles that make up a substance move. 20. As a sample of matter is cooled, its particles move more (slowly / quickly). 21. The particles that make up a solid move than do the particles that makes up a gas. 22. Matter that has a definite volume but no definite shape is a 23. Matter that has a definite volume and a definite shape is a 24. If you move a substance from one container to another and its volume changes, the substance is a Substance A Substance Substance 25. In the above picture, which substance is a liquid? 26. In the above picture, which substance is a solid? 27. In the above picture, which substance is a gas? 28. In the above picture, which substance are the forces of attraction among the particles so weak that they can be ignored under ordinary conditions? Melting and Boiling Points of Some Substances Substance Melting Point Boiling Point Hydrogen -259.3°C -252.9°C Nitrogen -210.0°C -195.8°C Acetic Acid 16.6°C 117.9°C Gold 1064.2°C 2856°C 29. Based on the information in the table above, the melting point of acetic acid is -2-

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