EXPERIMENT 4 STUDY QUESTIONS TO PREPARE FOR EXAMS) T/F 1 A pure substance can be

Question

EXPERIMENT 4 STUDY QUESTIONS TO PREPARE FOR EXAMS) T/F 1 A pure substance can be an element or a compound T/F 2. A solution is a homogeneous mixture. T/F 3. Determining chemical properties involves changing the identity of the substance being tested 4. The liquid filtered off the solid is called the precipitate. T/F T/F 5. Natural substances are safe and have no side effects. T/F 6. We would be better off in a world with no chemicals. T/F 7. Distillation separates substances based on differences in their boiling points. TYF &. Purification procedures have to remove both soluble and insoluble impurities. T/F 9. Purification usually results in more of the compound than what you started with. T/F 10. The filtrate is always waste material to be discarded. T/F 11. A glass rod is used to decant a liquid. 12. Solubility is an example of a property

Explanation / Answer

1.

True

2.

True

3.

True

4.

False

(The solid is precipitate not the liquid)

5.

False

(There are many natural substances with are harmful to us).

6.

False

(There are many chemical reactions which are occuring in our body daily).

7.

True

8.

True

9.

False

(On purification, you remove some mass as impurity).

10.

False

11.

False

12.

Chemical property.

Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.

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