Lesson Worksheet: Purity and Mixtures Science
In this worksheet, we will practice identifying pure substances and mixtures, giving examples, and comparing the arrangement of particles.
Q1:
A sink in the science laboratory of a school becomes blocked. The water in the sink contains several different chemicals from yesterday’s lessons that are not chemically combined. What word could be used to describe this collection of different substances?
- AA mixture
- BA combination
- CA concoction
- DA blend
- EA composition
Q2:
A student is given a mixture of sulfur powder and iron filings. As the individual substances in the mixture keep their own properties, which of the following items could be used to separate this mixture?
- AA Bunsen burner
- BA sheet of filter paper
- CA sieve
- DA magnet
- EA beaker
Q3:
Which of the following statements best describes a mixture?
- AA mixture is a substance that contains only one type of molecule.
- BA mixture is a substance that contains identical molecules made of two or more different atoms.
- CA mixture is a substance that contains only one type of atom chemically bonded together.
- DA mixture is a substance that contains different atoms chemically bonded together.
- EA mixture is a substance that contains different atoms not chemically bonded together.
Q4:
Deicer is often added into the windshield water tank in cars. Which of the following statements explains why this addition is necessary in cold winter months?
- ADeicer cleans the windshield more effectively.
- BDeicer stops pollen from sticking to the windshield.
- CDeicer raises the freezing point of water.
- DDeicer lowers the freezing point of water.
- EDeicer helps the windshield look polished.
Q5:
Some liquids can be pure but others can be mixtures.
Which of the following liquids is a mixture?
- AMineral water
- BTea
- CSoda
- DOrange juice
- EAll of the above
Q6:
Two high school students each synthesized a sample of acetaminophen. They tested the purity of their samples and recorded the results on graphs. Which student synthesized the sample with greater purity?
- AStudent B
- BStudent A
Q7:
Which of the following diagrams shows a mixture?
Q8:
The diagram shows the different atoms and molecules in a sample of air. Which of the following statements is the best description of this sample?
- AAir is a mixture of different compounds.
- BAir is a mixture of different gases.
- CAir is a mixture of liquids and gases.
- DAir is a mixture of the same elements.
Q9:
The particle model in the diagram shows a sample of silver metal. As well as the silver atoms, several smaller atoms can also be seen. What term could be used to describe these unwanted atoms in the piece of silver metal?
- ADislocation
- BImpurities
- CDirt
- DAlloys
- EPollutants
Q10:
Which of the following tables correctly classifies the substances into elements, compounds, and mixtures?
- A
Element Mixture Compound Seawater Air Soil - B
Element Mixture Compound Air Soil Seawater - C
Element Mixture Compound Seawater Air Soil - D
Element Mixture Compound Seawater Air Soil - E
Element Mixture Compound Seawater Air Soil
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