Question

directions: circle the term in parentheses that makes each statement correct. 7. a beam of light is (visible, invisible) as it passes through a solution, but (can, cannot) be seen as it passes through a colloid. 8. appearance and behavior are (chemical, physical) properties. 9. the change of one substance to another is a (chemical, physical) change. 10. when substances go through a chemical change, mass is always (lost, conserved).

Explanation:

1. In a solution, light passes without scattering, so it's invisible. In a colloid, the Tyndall effect makes the light beam visible.
2. Appearance and behavior describe physical properties like color, state, etc., not chemical reactions.
3. Changing one substance to another involves a chemical reaction, so it's a chemical change.
4. According to the law of conservation of mass, mass is conserved in a chemical change.

Answer:

1. invisible, can
2. physical
3. chemical
4. conserved