Question

Pure substances are (1)_______
in appearance. During boiling, the
temperature of a (2) _______changes at the start then it becomes (3)________
During melting, a substance melts (4)_________
within a short time.
To determine a (5)__________
sample if it is a pure substance. you should test
it using its boiling point; while if it is a (6) ________sample, its melting point is the
best way to test.
In Enrichment A, the liquid A is (7) ________since it has a fixed boiling point
while the water with salt is a mixture because it has a varying melting point.​

Answer 1

Answer:

Water changes from Ice to liquid water at 32 °F or 0 °C while Gold changes from solid to molten liquid at 1064.18 °C or 1947.52 °F.Liquids. Pure, crystalline solids have a characteristic melting point, the temperature at which the solid melts to become a liquid. The transition between the solid and the liquid is so sharp for small samples of a pure substance that melting points can be measured to 0.1oC.In the more general sense, a pure substance is any homogeneous mixture. That is, it is matter that appears uniform in appearance and composition, no matter how small the sample size. Examples of pure substances include iron, steel, and water. Air is a homogeneous mixture that is often considered to be a pure substance.

Answer 2

Explanation:

1. clean

2. water

3. cool

4. like ice

5. pure

6. dirty

7. experiment