Crystallisation Quiz (Form 1, Chemistry)

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True/False statements about crystallisation basics.

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Crystallisation Quiz (Form 1, Chemistry)


Crystallisation Quiz (Form 1, Chemistry)Online version True/False statements about crystallisation basics. by YAKILI LMS 1 A good crystallisation setup may include a condenser and a stand. Yes No 2 Solvent pairs are chosen to give a suitable boiling point range. Yes No 3 Recovery of solvent can help in drying crystals after filtration. Yes No 4 Drying the crystals completely is important to measure mass accurately. Yes No 5 The presence of air bubbles can influence crystallisation by providing nucleation sites. Yes No 6 An example of a solute is table salt (sodium chloride) in water. Yes No 7 Crystallisation involves formation of solid crystals from a saturated solution. Yes No 8 When crystals form, the solution becomes less concentrated as solute leaves solution. Yes No 9 Crystallisation can be used to obtain pure solids from impure samples. Yes No 10 Excess solvent can hinder crystallisation by keeping solute dissolved. Yes No 11 The rate of cooling can affect the crystal habit (shape and size). Yes No 12 Crystallisation experiments can be safely performed with common household solvents in school settings. Yes No 13 Seeding involves adding small crystals to initiate crystallisation. Yes No 14 Recrystallisation is a purification method based on differential solubility. Yes No 15 The crystals formed during crystallisation can be reused in further reactions when pure. Yes No 16 Crystallisation can separate components of a mixture based on different solubilities. Yes No 17 The crystal lattice is formed by the orderly arrangement of solute molecules. Yes No 18 As the solution cools, solubility decreases and crystals start to form. Yes No 19 Solubility is the same at all temperatures. Yes No 20 Roughly dissolving a solid before crystallisation helps uniform crystal growth. Yes No 21 Temperature control is key to obtaining good crystals. Yes No 22 The crystals formed are often colorless and clear in good purifications. Yes No 23 Slow cooling tends to produce larger, purer crystals. Yes No 24 Solvent choice is guided by solubility curves for the solute. Yes No 25 Crystallisation can purify a solid by excluding impurities that stay in solution. Yes No 26 A saturated solution is prepared by dissolving more solute at high temperature and then cooling. Yes No 27 Crystallisation of common salts in school labs is a standard example. Yes No 28 The solvent must be removed completely to obtain dry crystals. Yes No 29 Solubility data helps predict whether crystallisation will occur upon cooling. Yes No 30 Solubility typically increases with temperature for many solids. Yes No 31 Slow crystallisation generally leads to better-formed crystals than rapid crystallisation. Yes No 32 The mother liquor is the liquid left after crystals are removed. Yes No 33 Clear, colourless crystals indicate purity in many cases. Yes No 34 Crystallisation relies on the difference in solubility of a substance at different temperatures. Yes No 35 Impurities may remain dissolved in the solution after crystallisation. Yes No 36 Crystallisation is a physical change, not a chemical reaction. Yes No 37 The process can be used to separate two solids with very different solubilities. Yes No 38 Filtration is commonly used to collect crystals from the mother liquor. Yes No 39 Crystallisation can be accelerated by seeding with a small crystal. Yes No 40 The rate of crystallisation influences crystal size and quality. Yes No 41 Crystals form when a solution becomes supersaturated. Yes No 42 Gravity filtration is often used to separate crystals from solution. Yes No 43 Solubility can be different in ethanol than in water for the same solute. Yes No 44 Crystallisation is often performed at a temperature where the solute is sparingly soluble. Yes No 45 The presence of multiple solutes can affect crystallisation outcomes. Yes No 46 The purity of crystals can be checked by simple melting point estimation. Yes No 47 The dryness of crystals is checked by weighing after drying. Yes No 48 The process can be used to purify table salt from seawater impurities. Yes No 49 The solvent choice affects solubility and the success of purification. Yes No 50 A hot saturated solution is required to dissolve maximum solute. Yes No

Crystallisation Quiz (Form 1, Chemistry)

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Created by

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Crystallisation Quiz (Form 1, Chemistry)Online version

by YAKILI LMS

A good crystallisation setup may include a condenser and a stand.

Solvent pairs are chosen to give a suitable boiling point range.

Recovery of solvent can help in drying crystals after filtration.

Drying the crystals completely is important to measure mass accurately.

The presence of air bubbles can influence crystallisation by providing nucleation sites.

An example of a solute is table salt (sodium chloride) in water.

Crystallisation involves formation of solid crystals from a saturated solution.

When crystals form, the solution becomes less concentrated as solute leaves solution.

Crystallisation can be used to obtain pure solids from impure samples.

Excess solvent can hinder crystallisation by keeping solute dissolved.

The rate of cooling can affect the crystal habit (shape and size).

Crystallisation experiments can be safely performed with common household solvents in school settings.

Seeding involves adding small crystals to initiate crystallisation.

Recrystallisation is a purification method based on differential solubility.

The crystals formed during crystallisation can be reused in further reactions when pure.

Crystallisation can separate components of a mixture based on different solubilities.

The crystal lattice is formed by the orderly arrangement of solute molecules.

As the solution cools, solubility decreases and crystals start to form.

Solubility is the same at all temperatures.

Roughly dissolving a solid before crystallisation helps uniform crystal growth.

Temperature control is key to obtaining good crystals.

The crystals formed are often colorless and clear in good purifications.

Slow cooling tends to produce larger, purer crystals.

Solvent choice is guided by solubility curves for the solute.

Crystallisation can purify a solid by excluding impurities that stay in solution.

A saturated solution is prepared by dissolving more solute at high temperature and then cooling.

Crystallisation of common salts in school labs is a standard example.

The solvent must be removed completely to obtain dry crystals.

Solubility data helps predict whether crystallisation will occur upon cooling.

Solubility typically increases with temperature for many solids.

Slow crystallisation generally leads to better-formed crystals than rapid crystallisation.

The mother liquor is the liquid left after crystals are removed.

Clear, colourless crystals indicate purity in many cases.

Crystallisation relies on the difference in solubility of a substance at different temperatures.

Impurities may remain dissolved in the solution after crystallisation.

Crystallisation is a physical change, not a chemical reaction.

The process can be used to separate two solids with very different solubilities.

Filtration is commonly used to collect crystals from the mother liquor.

Crystallisation can be accelerated by seeding with a small crystal.

The rate of crystallisation influences crystal size and quality.

Crystals form when a solution becomes supersaturated.

Gravity filtration is often used to separate crystals from solution.

Solubility can be different in ethanol than in water for the same solute.

Crystallisation is often performed at a temperature where the solute is sparingly soluble.

The presence of multiple solutes can affect crystallisation outcomes.

The purity of crystals can be checked by simple melting point estimation.

The dryness of crystals is checked by weighing after drying.

The process can be used to purify table salt from seawater impurities.

The solvent choice affects solubility and the success of purification.

A hot saturated solution is required to dissolve maximum solute.