Easy question on chromatography Drawing B shows what the finished chromatogram looked like. Sam has drawn lines on it to help her to see which blobs are level with each other.

2 Three of the inks have only one colour in them.

a Which three are they?

b Explain your answer.

3 a Which inks are mixed to make ink C?

b Which inks are mixed to make ink D?

Which of the following is an example of how telecommunication devices people do their jobs? a.) a security guard checks the time using a digital watch. b.) a banker does some quick math using a solar calculator. c.) a nurse uses a digital thermometer to take a patient’s temperature. d.) a construction worker reports in to his office using a cell phone.