1.which of the following is considered as pure sbtance
A.mineral water C.seawater
B.tap water D.distilled water
2.the following are properties of mixture EXCEPT
A.it has definite boiling point C.it has definite composition
B.it has definite melting point D.it has definite apprearance
3.a certain liquid boils at exactly 82.5 C. after 2 minutes of boiling it,it was obseved that its temperature did not increase.the liquid considered as__________
A.mixture B.pure subtance
C.soltion D.either pure sbtanceor mixture
4.after boiling water from yorfaucet, you ovserved that thare are white, chalk-like resideu in the kettle. this observation proved that water from the faucet is an example of___________
A.pure sbtance C.element
B.mixtre D.neither puresbtance nar mixtre
5.which of the following shod be the basis in identifiying the unknow material as pure subtance or mixture
I. physical appearance shod be same
II. if it iss liquid, boilling point shod not change even after a being boiled for a while
III. if it is liquid, there shoud be definite boling point
IV. if it is solid, it shoud have portion that seemes to be not melting
A. I only C.II and III only
B.I and II only D.IIIand IV only
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Answer:
1. B
2. A
3. D
4. C
5. B
Explanation:
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