Question

directions: complete the sentences by writing the letters of the correct terms on the lines provided. 16. all substances are built from _. a. elements b. atom c. metal d. salt 17. a beam of light can be seen as it passes through a(n) _. a. colloid b. solution c. element d. compound 18. a _ is a homogenous mixture of particles so small they cant be seen and will not settle to the bottom of their container. a. colloid b. solution c. element d. compound 19 classification of matter

Explanation:

1. All substances are made up of atoms. Atoms are the basic building - blocks of matter. Elements are made of one type of atom, metal is a type of element, and salt is a compound.
2. The Tyndall effect, where a beam of light is visible as it passes through a medium, is observed in colloids. Solutions, elements, and compounds do not show this effect visibly under normal conditions.
3. A solution is a homogeneous mixture of very small particles that do not settle out and are not visible to the naked eye. Colloids have slightly larger particles than solutions, and elements and compounds are pure substances, not mixtures.

Answer:

1. b. atom
2. a. colloid
3. b. solution