Question

section: mixtures

1. a pizza is a(n)

properties of mixtures

1. a combination of two or more substances that are not chemically combined is a(n)
2. when two or more materials combine chemically, they form a(n)
3. how can you tell that a pizza is a mixture?
4. mixtures are separated through changes.

match the correct method of separation with the each substance. write the letter in the space provided. each method may be used only once.

1. crude oil a. distillation
2. a mixture of aluminum and iron b. magnet
3. parts of blood c. filter
4. sulfur and salt d. centrifuge
5. granite can be pink or black, depending on the of feldspar, mica, and quartz.

solutions

1. which of the following is not true of solutions?

a. they contain a dissolved substance called a solute.
b. they are composed of two or more evenly distributed substances.
c. they contain a substance called a solvent, in which another substance is dissolved.
d. they appear to be more than one substance.

1. the process in which particles of substances separate and spread evenly through a mixture is known as

Explanation:

1. A pizza is a mixture as it has multiple substances like cheese, sauce, and toppings not chemically combined.
2. A combination of two or more substances not chemically combined is a mixture.
3. When substances combine chemically, they form a compound.
4. A pizza is a mixture because its components (toppings, crust, sauce) can be physically separated and are not chemically bonded.
5. Mixtures are separated through physical changes.
6. Crude oil is separated by distillation as its components have different boiling - points.
7. A magnet can be used to separate a mixture of aluminum and iron since iron is magnetic and aluminum is not.
8. Parts of blood are separated by centrifugation which uses centrifugal force to separate components by density.
9. Sulfur and salt can be separated by adding water (salt dissolves, sulfur doesn't) and then filtering and evaporating.
10. Granite's color depends on the proportion of feldspar, mica, and quartz.
11. Option d is not true of solutions as solutions appear as a single substance.
12. The process is called diffusion.

Answer:

1. Mixture
2. Mixture
3. Compound
4. Its components can be physically separated and are not chemically bonded.
5. Physical
6. a. distillation
7. b. magnet
8. d. centrifuge
9. First dissolve in water, filter, then evaporate (not among given options exactly but conceptually).
10. Proportion
11. d. They appear to be more than one substance.
12. Diffusion