CHEM Mixtures & Separation

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Ch 3 Mixtures & Its Separation

What your name? *

1. Which one is not the characteristic of pure substances? *

1 point

Has definite composition

Has fixed melting and boiling point

Can be separated into its components

Has a definite set of properties

2. Ice has a fixed boiling point *

1 point

100° C

0° C

200° F

none of the above

3. A mixture may be solid, liquid or gas, or a combination of any of these states *

1 point

True

False

4. Formation of mixture does not involve any change in *

1 point

Light

Energy

Heat

None of the above

5. Which one is mixture *

1 point

Oxygen

Carbon di oxide

Air

Common Salt

6. A pure substance has only one kind of particles *

1 point

True

False

7. Common salt can be separated by *

1 point

filtration

sublimation

evaporation

none of the above

8. Separating chaff from grains is called *

1 point

filtration

winnowing

handpicking

evaporation

9. Clear liquid above the sediment is called *

1 point

constituent

supernatant

residue

none of the above

10. Ammonium chloride sublimes on heating *

1 point

True

False

11. The solid left on a filter is called *

1 point

filtrate

solute

residue

sediment

12. Constituents of mixtures can't be separated by simple physical means *

1 point

True

False

13. .............. water is not a mixture. *

1 point

Distilled

Tap

Ground

None of the above

14. Decantation is the process of pouring the clear supernatant liquid *

1 point

Yes

Maybe

15. Magnetic separation is used to separate *

1 point

Salt from sugar

Iron particles from saw dust

Glass particles from sand

None of the above

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