Year 10 Science · Unit 2 · Lesson 17
Foundation Worksheet
Learning Goals
Match each everyday reaction to its type and application
Draw a line connecting each reaction on the left to its correct description on the right. Or write the matching letter in the answer column.
| Reaction | Your answer | Type & application |
|---|---|---|
| Baking soda + vinegar | A. Enzyme-catalysed; breaks lactose into glucose + galactose for digestion | |
| Bread browning in a toaster | B. Acid-base; produces CO₂ bubbles, used in baking and fire extinguishers | |
| Saponification (soap making) | C. Decomposition; CaCO₃ heated → CaO + CO₂, used in cement production | |
| Lactase enzyme in the gut | D. Exothermic synthesis; CaO + H₂O → Ca(OH)₂, sets concrete | |
| Limestone → quicklime (kiln) | E. Maillard reaction; amino acids + sugars at high heat → browning and flavour | |
| Quicklime + water (concrete setting) | F. Fat + NaOH → glycerol + soap; base-catalysed synthesis |
Sort it!
Write each example from the pool into the correct category box. Each example belongs to exactly one category.
Endothermic
Exothermic
Acid-base
Decomposition
Enzyme-catalysed
1. When you mix baking soda and vinegar, a gas is produced. Identify the gas, name the reaction type, and give one everyday use of this reaction.
2. Explain why searing a steak at high temperature produces a brown crust with complex flavours, while boiling the same steak at 100°C does not. Name the reaction responsible.
Wrap Up
In one sentence, explain how the same reaction types you study in chemistry appear in your kitchen every day.