An atom changes to a charged particle called ion if it loses or gains electrons. The charge on an ion is the charge on electrons plus charge 15-04-2018 on protons. Now, write the missing information in the table given below: Name of Ion Proton Charge Electron Charge Ion Charge Hydroxide ion +9 — –1 Sodium ion +11 — +1 Aluminium ion +13 –10 — Oxide ion +8 –10 — Plan a Strategy • Some problems contain a lot of information. Read the entire problem carefully to be sure you understand all of the facts. You may need to read it over several times perhaps aloud so that you can hear yourself. • Then decide which information is the most important (prioritise). Is there any information that is absolutely necessary to solve the problem? This information is the most important. • Finally, put the information in order (sequence). Use comparison words like before, after, longer, shorter, and so on to help you. Write down the sequence before you try to solve the problem. Read the problem given below and then answer the questions that follow: • Five friends are standing in a line waiting for the opening of a show. They are in line according to their arrival. Shreya arrived 3 minutes after Sachin. Roy took his place in line at 9:01 P.M. He was 1 minute behind Reena and 7 minutes ahead of Shreya. The first person arrived at 9:00 P.M. Babu showed up 6 minutes after the first person. List the time of each person’s arrival.
- (a)Whose arrival information helped you to determine arrival time of each?
- (b)Can you determine the order without the time?
- (c)List the friends’ order from the earliest arrival to the last arrival. 15-04-2018