Pupil sheet · Formulae and equations
Formulae and equations — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. state / define / deduce
(a) Write the formulae of carbon dioxide, ammonia and calcium carbonate. (b) A model of a molecule has one sulfur atom joined to three oxygen atoms. Write its formula, and state what this molecular formula tells you. (c) Supplement: write the empirical formula of glucose, C6H12O6. (d) Supplement: write the formula of magnesium nitrate, made of Mg2+ and NO3− ions.
(a) Three formulae
(b) The model's formula and its meaning
(c) Supplement: empirical formula of glucose
(d) Supplement: magnesium nitrate
2. construct
Aluminium powder burns in oxygen to make aluminium oxide, Al2O3. Balance the equation.
Write a number in front of each formula. Leave it blank for 1.
____ Al(s) + ____ O2(g) → ____ Al2O3(s)
3. construct / deduce
Supplement. (a) Magnesium ribbon is dropped into blue copper(II) sulfate solution. Pink-brown copper forms on the ribbon and magnesium ions go into solution. Write the ionic equation. (b) Calcium burns in oxygen to make solid calcium oxide, CaO. Write the balanced symbol equation with state symbols.
(a) Ionic equation
(b) Symbol equation with state symbols