IB myp 4-5 Chemistry – Practice Questions- All Topics
Topic :Types of chemical reaction–uses of salts
Topic :Types of chemical reaction-Weightage : 21 %
All Questions for Topic :acids and bases,neutral solutions,acid/base reactions,$\mathrm{pH}$ and indicators,formation of salts,uses of salts,redox reactions,reactivity series,extraction of metals and corrosion,electrochemical cells
Question:
Identify the main dissolved salts contributing to the alkalinity of the lake.
▶️Answer/Explanation
Ans: Chloride, carbonate and sulfate salts.
Identify an unknown salt
As a result of high humidity in the chemical storeroom, the labels on five separate reagent bottles were lost. You will need to design a series of analytical tests to identify their composition.
A selection of analytical tests for cations and anions is summarized below.
Question:
All of the salts are soluble in water. Design a series of tests to identify the composition of salts A–E. Your method should include a description of apparatus used and descriptions of the experimental techniques.
▶️Answer/Explanation
Ans: There are 5 different tests for which a method should be written. The tests are for cations, halide ions of chlorine, bromine and iodine, sulfate ion and the carbonate ion. Each method should describe the type and size of apparatus being used and the technique used to transfer solutions safely and precisely. [1 mark for each test]
Question:
Design a results’ table to accompany your experimental design
▶️Answer/Explanation
Ans: Data table should have the following features:
- Summary/identification of the tests performed for cations and for anions
- Qualitative observations for each test, including initial and final colors
- Assessment of whether the test is positive or negative
- Identification of the cation present
- Identification of the anion present
Marks awarded on a scale from 0 marks for a completely inadequate data table design to 10 marks for an exemplary design.