Group 7: the halogensIB MYP Chemistry: Flashcards
What these 14 flashcards ask
- How many electrons are in the outer shell of a halogen atom?
- What does diatomic mean?
- What is chlorine's colour and state at room temperature?
- What is bromine's colour and state at room temperature?
- What is iodine's colour and state at room temperature?
- What is the trend in melting and boiling points down Group 7?
- What is the trend in reactivity down Group 7?
- Why does reactivity decrease down Group 7?
- What charge does a halide ion have?
- What is a displacement reaction?
- Write the equation for chlorine and potassium bromide.
- What happens when iodine is added to potassium bromide solution?
- What is chlorine used for?
- What is iodine used for?
Exam questions on Group 7: the halogens
- A nurse in a clinic in Nairobi cleans a patient's cut with a brown iodine solution before applying a dressing. Iodine is a Group 7 element, one of the halogens.Explain why the nurse uses iodine solution on the cut.2 marks
- A chemist adds a few drops of orange bromine water to a colourless solution of potassium iodide, and the mixture turns brown. She then adds bromine water to a colourless solution of potassium chloride and sees no change.Write the balanced symbol equation for the reaction of bromine with potassium iodide.2 marks
- A data book gives these melting and boiling points. Chlorine melts at −101 °C and boils at −34 °C. Bromine melts at −7 °C and boils at 59 °C. Iodine melts at 114 °C and boils at 184 °C. A chemist wants to predict the properties of fluorine, which lies above chlorine in Group 7. Room temperature is 25 °C.State the physical state of chlorine, bromine and iodine at 25 °C.3 marks
Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).