Electrochemical cellsIB MYP Chemistry: Flashcards

What these 13 flashcards ask

What energy change happens in an electrochemical cell?
What is a simple cell made from?
What is the electrolyte in a cell?
Which metal is the negative terminal?
In which direction do electrons flow in the wires?
What carries the charge through the electrolyte?
What decides the voltage of a simple cell?
Which pair of metals gives a bigger voltage: zinc-copper or iron-copper?
What is the difference between electrochemical and electrolytic cells?
What is a battery?
Why does a disposable battery stop working?
What is the equation for a hydrogen-oxygen fuel cell?
What is a major advantage of hydrogen fuel cells?

Exam questions on Electrochemical cells

A student makes a simple cell by placing a strip of zinc and a strip of copper in a beaker of sodium chloride solution, and joins the two strips to a voltmeter with wires. The voltmeter shows a reading of about 1 V.
State the purpose of the sodium chloride solution in the cell.2 marks
A student makes simple cells by connecting a copper strip and a strip of a second metal to a voltmeter, with both strips dipped in the same salt solution. The second metal was magnesium in the first cell, zinc in the second and iron in the third. The readings were 2.0 V, 1.1 V and 0.7 V respectively. In every cell the second metal was the negative terminal.
Describe the pattern in the results.2 marks
A car manufacturer in Seoul has developed a car powered by a hydrogen-oxygen fuel cell. Hydrogen from a pressurised tank and oxygen from the air are fed into the fuel cell, which produces the electricity that drives the motor. The only substance leaving the exhaust is water.
Outline how a hydrogen-oxygen fuel cell produces electricity.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).