Chemical Compounds and Equations — O/L Science

What must I remember about Chemical Compounds and Equations?

• Factors that increase reaction rate: higher temperature, higher concentration, smaller particle size, catalyst
• Exothermic reactions release energy to surroundings (combustion, neutralisation, respiration)
• Endothermic reactions absorb energy from surroundings (photosynthesis, thermal decomposition)
• Law of Conservation of Mass: total mass of reactants = total mass of products

Test yourself (1 minute)

1. Exothermic

   releases heat (combustion, neutralisation); ΔH < 0

2. Endothermic

   absorbs heat (thermal decomposition); ΔH > 0

3. Activation energy

   minimum energy needed to start reaction

Practise Chemical Compounds and Equations questions today

Must know

• Collision theory: reaction occurs when particles collide with sufficient energy

Source: NIE O/L Science — Unit 3: Chemical Reactions

What should I study first?

What comes next?

Next in the syllabus

Where does Chemical Compounds and Equations fit in the syllabus?

Grade 11 · Term 1