Chapter 2B:Heterogeneous Mixtures

Question 1

Heterogeneous mixture:

Answer 1

Particles
- Not evenly spread
- Sizes vary
- Identified from one another

Types:
1. Suspension
2. Colloids

Question 2

Suspensions

Answer 2

• Suspended particles (floating/ partially submerged)
• Big enough to be seen by eyes
• Particles gradually settle down at the bottom (gravity)

Question 3

Colloids

Answer 3

• Particle size
• Solution<Colloid<Suspension
  Particles don’t settle at the bottom of the container

Eg.: Mayo, milk, jelly/gelatin, fog, blood, glue

Question 4

Tydnall effect

Answer 4

• Scattering of light due to colloid particles.

Question 5

Ways of separating mixtures

Answer 5

3. Manual Method
   - Mixtures with components of different sizes.
   - Can be done by hand with different tools.
4. Decantation
   - Mixture is allowed to stand for a certain period.
5. Flotation
   - Solids of a mixture are allowed to settle
   - Less dense material is poured off with the liquid

Distillation
- Involves 1. Heating 2. Condensing solutions (nonvolatile)
- Distillate: Liquid collected

7. Chromatography
   - Uses adsorptive materials that lets different components to flow through the material at different speeds.

Question 6

Pure Substances

Answer 6

• One type of substance or particle
• Not seperated by physical means
  -Defenite/ Fixed composition
• Element (atoms/molecules) and compounds

1. Boiling points

• Temperature; liquid starts to boil
• Pure substance have constant and lower boiling points

Question 7

Elements

Answer 7

• They’re the building blocks of matter. All forms of matter are made up of elements. They cannot be broken down into simpler substances.

Question 8

THERE ARE 118 ELEMENTS ROMAN NOISES👺👹

Answer 8

• 90 occur naturally
• 28 are laboratory made
• about 30 elements are important to our daily lives

Question 9

Jons Jacob Berzellius

Answer 9

• He proposed that a chemical element should be represented by a chemical symbol with 1 or 2 letters

Question 10

More Information

Answer 10

• Theses symbols can come from the first letter of the elements, scientist’s name, its place or its Latin name

Question 11

Mecury (Hg)

Answer 11

It’s the only metal that is room temp.

Question 12

Metals are…

Answer 12

• hard
• shiny
• malleable
• ductile
• good conductors of heat and energy
• extracted from ores

Question 13

Solid nonmetals are…

Answer 13

• dull
  -brittle
  -poor conductors of heat and electricity