Find similarities and differences in the properties of these substances: sugar and soda, water and vinegar, copper and iron.

1) sugar and soda:
a) similarities – solid, white, readily soluble in water.
b) differences – sugar is sweet, has a low melting point, its crystals are larger than those of soda and are transparent.

2) water and vinegar:
a) similarities – under normal conditions, colorless, transparent liquids;
b) differences – water is odorless and tasteless, vinegar has a characteristic odor and sour taste.

3) copper and iron:
a) similarities – metallic luster, plastic, conduct electric current;
b) differences – red copper, iron – gray, different melting points.