Question

1. 2 examples of a substance?
2. 2 examples of mixtures!
3. 3 examples of elements / 3 of compounds
4. use the book to find 2 examples of suspensions?
5. \ \ to find 2 \ \ colloids?
6. 2 examples of solutions?

Explanation:

1. Substances: Water, salt. Substances have a definite composition.
2. Mixtures: Air, salt - water solution. Mixtures are composed of two or more substances physically combined.
3. Elements: Oxygen, hydrogen, gold. Compounds: Water (H₂O), carbon - dioxide (CO₂), sodium chloride (NaCl). Elements are pure substances made of one type of atom, compounds are made of two or more different elements chemically combined.
4. Suspensions: Muddy water, chalk - water mixture. Suspensions are heterogeneous mixtures where particles settle out over time.
5. Colloids: Milk, fog. Colloids have particles that do not settle out quickly and scatter light (Tyndall effect).
6. Solutions: Sugar - water, ethanol - water mixture. Solutions are homogeneous mixtures where the solute is uniformly distributed in the solvent.

Answer:

1. Water, salt
2. Air, salt - water solution
3. Elements: Oxygen, hydrogen, gold; Compounds: Water, carbon - dioxide, sodium chloride
4. Muddy water, chalk - water mixture
5. Milk, fog
6. Sugar - water, ethanol - water mixture