IB myp 4-5 Chemistry – Practice Questions- All Topics
Topic :Pure and impure substances–states and properties of matter
Topic :Pure and impure substances- Weightage : 21 %
All Questions for Topic : types of mixtures [solutions, oils, alloys, emulsions],separation techniques including: filtration, distillation [including
crude oil],chromatography
Question:
For each of the conductors, classify them as poor, good and very good conductors.
▶️Answer/Explanation
Ans: 
* NH3 + H2O ↔ NH4+ + OH–
** The presence of a wide range of dissolved ions makes tap water a conductor
Question:
Scientists use three-dimensional visualizations or models to enable a clear understanding of the concept being examined. How do other professions use modelling or simulations to convey meaning?
▶️Answer/Explanation
Ans: Some possible examples of models include:
- Models are used in government departments to plan and visualize transport and infrastructure systems
- Models are used in business and finance industries to predict future economic activity and justify business decisions.
Question:
What did you observe when you placed the seed crystal into the saturated solution?
▶️Answer/Explanation
Ans: When the seed crystal is placed into a saturated solution, fine needle–like crystals begin to appear and eventually fill the beaker.