11 What is radioactivity 12 What is half life 13 If we start
Last updated: 4/28/2023
11 What is radioactivity 12 What is half life 13 If we start with 400 atoms of a radioactive substance how many would remain after one half life after two half lives after four half lives after three 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 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 than do the particles that makes up a gas 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 Substance B Substance A 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 Substance C 2856 C the table above the melting point of acetic acid is