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:

1. constant

2. heterogeneous

3. homogeneous

4. completely

5.liquid

6.solid

7.pure substance

Explanation:

I was struggling at numbers 2 & 3 but i checked the definition of both hetero and homo. hetero can be visible in the naked eye, otherwise it's homo. I hope this help.