20. Which statement is TRUE about pure substances?
A. Pure substances are heterogeneous.
B. The temperature is fixed and sharp.
C. They can be separated easily.
D. They melt incompletely.
A. Pure substances are heterogeneous.
B. The temperature is fixed and sharp.
C. They can be separated easily.
D. They melt incompletely.
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D
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Pure substances contain only one kind of particle. (ii) Pure substances may be compound or mixture. (iii) Pure substances have the same composition throughout. (iv) Pure substances can be exemplified by all elements other than nickel.