| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
|
The masses of reactants and products can be calculated from balanced symbol equations. |
|
(HT only)Balance the equation and calculate the mass of the reactants and products of the balanced symbol equation:
H2O2 --> H20 02 Balance chemical equations and use these to calculate the masses of substances present.
Extended writing: write instructions to another student use balanced chemical equations to calculate the masses of substances present.
YouTube:
Calculating Masses in Reactions
https://www.youtube.com/watch?v=6KRcO3e36ZU |
|
|
|
Chemical equations can be interpreted in terms of moles. For example: Mg + 2HCI --> MgCI2 + H2 shows that one mole of magnesium reacts with two moles of hydrochloric acid to produce one mole of magnesium chloride and one mole of hydrogen gas. |
|
(HT only)In the following equation:
Mg 2HCI --> MgCI2 H2
What is the ratio of magnesium (Mg) atoms react in comparison to that of hydrochloric acid (HCl)? |
|
|
|
Students should be able to calculate the masses of substances shown in a balanced symbol equation |
|
(HT only)CaCO3 2HCl ---> CaCl2 CO2 H2O
Use the above equation to determine the mass of carbon dioxide produced if you react 10g of calcium carbonate with an excess of hydrochloric acid? |
|
|
|
Students should be able to calculate the masses of reactants and products from the balanced symbol equation and the mass of a given reactant or product. |
|
(HT only)Calculate the mass of iron produced when 32g of iron (III) oxide is completely reduced by aluminium.
The reaction is shown in the symbol equation: Fe2O3 2Al ? 2Fe Al2O3 |
|
|
|
The balancing numbers in a symbol equation can be calculated from the masses of reactants and products by converting the masses in grams to amounts in moles and converting the numbers of moles to simple whole number ratios. |
|
(HT only)How can you use the massess of reactants and products to balance a symbol equation? |
|
|
|
Students should be able to balance an equation given the masses of reactants and products. |
|
(HT only)
Reactants
Sb = 488g
Cl2 = 426g
Products
SbCl3= 914g
Complete a symbol equation for the reaction above using the masses to balance the equation. |
|
|
|
Students should be able to change the subject of a mathematical equation. |
|
(HT only)How do you rearrange the moles equation to find the relative formulat mass? Moles = mass / RFM |
|
|