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- 1. Multiple Choice
What happens when salty water is boiled?
The salt becomes a new compound and water evaporates as it has a low boiling point
The water evaporates and the salt remains in the beaker as it has a high melting point
The water becomes a new compound and evaporates while salt remains in the beaker
The water will disappear and the salt remains in the beaker as it is a solid
- 2. Multiple Choice
Which of the following separations cannot be carried out using a centrifuge? The separation of:
water from wet clothes
cream from milk
red blood cells from plasma
salt from sea water
- 3. Multiple Choice
What happens when sugar is mixed with water?
The sugar and water become a new compound that can be separated by crystallization
The sugar dissolves as it is a solid and can be separated by crystallization
The sugar and water become a mixture that can be separated by crystallization
The sugar and water become a mixture that can be separated by filtration
- 4. Multiple Choice
Which of the following is a correct statement about distillation
The components of the mixture have different densities
The components of the mixture have different melting points
The components of the mixture have different boiling points
The components of the mixture form a heterogeneous mixture
- 5. Multiple Choice
The table below list four liquids with four different densities. Liquid 1,2,3 and 4 are immiscible and you are asked to separate them using a decantation funnel. In what order would the liquids form layers from TOP to BOTTOM?
3, 2, 1, 4
4, 1, 2, 3
1, 2, 3, 4
3, 2, 4, 1
- 6. Multiple Choice
Matter can be classified by analyzing its composition as it is shown in the diagram. Steel is a material that contains two elements: iron (Fe) and carbon (C). Two different samples of steel have different quantities of these two elements, but both have uniform composition. Using the diagram above, how would you classify steel?
As pure substance, because it has uniform composition and it is a compound
As a heterogeneous mixture, because is formed by two different elements
As a homogeneous mixture, because is formed by two different elements and it is uniform
As pure substance, because different samples have different composition
- 7. Multiple Choice
What is the correct order for obtaining salt from a mixture of sand and salt?
Dissolving in water - filtration – evaporation
Evaporation - filtration - dissolving in water
Filtration - dissolving in water - evaporation
Dissolving in water – evaporation - filtration
- 8. Multiple Choice
The process used to separate heterogeneous mixtures of solids and liquids is called
filtration
crystallization
distillation
chromatography
- 9. Multiple Choice
The formation of pure solid particles of a substance from a solution is called
filtration
crystallization
distillation
chromatography
- 10. Multiple Choice
Complete the sentence:
___________ allows to separate the fine flour particles from bigger impurities (lumps).
Filtration
Decantation
Sieving
Magnetism
- 11. Multiple Choice
Name the separation technique shown in the diagram
Filtration
Chromatography
Centrifugation
Distillation
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