Balanced equations and reacting massesEdexcel International A Level Chemistry: Flashcards

What these 13 flashcards ask

What are the four state symbols?
What may you change to balance an equation?
What is a spectator ion?
Give the ionic equation for zinc reacting with copper(II) sulfate solution.
What is observed when zinc is added to copper(II) sulfate solution?
Give the ionic equation for a carbonate reacting with an acid.
What is observed when a carbonate reacts with acid?
Give the ionic equation for the reaction of an acid with an alkali.
What is observed when lead(II) nitrate and potassium iodide solutions are mixed?
Write the ionic equation for the formation of silver chloride.
Outline the four steps in a reacting-mass calculation.
What is a limiting reagent?
How do you find the amount of a substance in solution?

Exam questions on Balanced equations and reacting masses

A student places granules of zinc in blue copper(II) sulfate solution, CuSO₄(aq), and watches the reaction over several minutes.
Explain why this reaction occurs, and identify the spectator ion.2 marks
A student adds magnesium carbonate in small portions to 50.0 cm³ of hydrochloric acid of concentration 1.00 mol dm⁻³ until no more solid dissolves. Relative atomic masses: C = 12.0, O = 16.0, Mg = 24.3.
Calculate the maximum mass of magnesium carbonate that can react with the acid.2 marks
A teacher demonstrates a precipitation reaction by mixing 25.0 cm³ of 0.100 mol dm⁻³ lead(II) nitrate solution, Pb(NO₃)₂(aq), with an excess of potassium iodide solution, KI(aq). Relative atomic masses: I = 126.9, Pb = 207.2.
Write the full equation, with state symbols, and the ionic equation, with state symbols, for the reaction, and state what is observed.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).