Soldering is accomplished by quickly heating metal parts. solder is a metal that is melted to join metallic surfaces together. common solder formulations based on tin and lead are listed below. the fraction represents percentage of tin first, then lead, totaling 100%.

tin/lead melting point (°c)
40/60 230 °c
50/50 214 °c
60/40 190 °c
63/37 183 °c
95/5 224 °c

with the same soldering iron, assuming the soldering iron’s highest temperature is 204 degrees centigrade, would you be able to make the repair if you had solder made of 50/50?

  No.

Step-by-step explanation:

50/50 solder is shown to melt at 214 °C. If the soldering iron only heats to 204 °C, it cannot melt the solder. The solder will only be melted if it is heated to a temperature at or higher than its melting point.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

can you put the picture up?

step-by-step explanation: