identifying mixtures\nsimon has collected three samples from the coral reef where he observes marine life…
identifying mixtures\nsimon has collected three samples from the coral reef where he observes marine life. he must determine whether each one is a pure substance or a mixture.\n|appearance|when heated|when left over time|\n|----|----|----|\n|sample a|clear liquid|evaporates completely at 70°c|appearance does not change|\n|sample b|clear, blue liquid|boils at 90°c, leaving blue crystals behind|appearance does not change|\n|sample c|opaque, whitish liquid|boils at 100°c, leaving white crystals behind|dust appears to settle to the bottom|\nsample a is a \nsample b is a \nsample c is a
Answer
Explanation:
Step1: Analyze Sample A
A pure substance has a definite boiling - point and evaporates completely without leaving residues. Sample A is a clear liquid that evaporates completely at 70°C and its appearance doesn't change over time. So it is a pure substance.
Step2: Analyze Sample B
A mixture has components that can be separated by physical means like boiling. Sample B is a clear, blue liquid that boils at 90°C leaving blue crystals behind. This indicates it is a mixture.
Step3: Analyze Sample C
Sample C is an opaque, whitish liquid. It boils at 100°C leaving white crystals behind and dust settles to the bottom over time. These are characteristics of a mixture.
Answer:
Sample A is a pure substance, Sample B is a mixture, Sample C is a mixture.