1.which of the following would allow you to identify the nature of an unknown mixture?
A. it shines
B. it smells
C. components are recognizable
D. components can be separated chemically
2.which of the following is an example of a pure substance?
A. cloth
B. diamond
C. salt in water
D. sand in water
3.how can salt be separated from ocean water?
A. using a sifter
B. using magnet
C. through picking
D. through evaporation
4.a student investigate the nature of an unknown substance. he decided to heat a sample of a blue-green powder and eventually it turned into a colorless gas and a black solid. what could be the nature of the original substance and why?
A. mixture, because it is homogenous
B. mixture, because the material contains two or more substance
C. substance, because heating the sample produced two different substance
D. element, because the original sample can be further divided into simpler substance
5.Gio heated liquid in a casserole. he forgot to turn the stove right away and all the liquid was gone. he noticed that there were solid materials that settled at the surface of the casserole. what can be inferred from this observation?
A. the liquid was a pure substance
B. the liquid was composed of a single material
C. the liquid was a mixture of dissolved solid materials
D. the liquid was a pure substance because it evaporated
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I am not slight sure in some of my answer but I hope I help.