Q: What is the dullest element? A: Bohrium. Key concepts: Describe 3 properties of mixtures Describe...
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Transcript of Q: What is the dullest element? A: Bohrium. Key concepts: Describe 3 properties of mixtures Describe...
Mixtures!
Q: What is the dullest element? A: Bohrium
Key concepts:
• Describe 3 properties of mixtures• Describe and identify the 3 types of mixtures
by their properties• Describe the Tyndall Effect• Give everyday examples of mixtures
Key Vocabulary:
• Mixture• Heterogeneous• Homogeneous• Suspension• Colloid• Solution
Imagine a world of legos:
Make up compounds and mixtures:
ELEMENTS:
Matter
Mixture Pure Substance
ElementCompoundHeterogeneous Mixture
Homogeneous Mixture
Can be separated physically
Cannot be separated physically
Can see the parts
Cannot see the parts
Can be separated chemically
Cannot be separated
Most impure Most pure
Summary:
1.What is the difference between pure and impure substances?
2. What is differences between an solution, colloid and suspension?
3. What are some everyday examples of each type of mixture
Mixtures:
• A mixture is a combination of two or more substances that are not chemically combined.
• Think about trail mix or a pizza…– Can you taste the tomato pasta?
Meat?• You can separate mixtures
physically. – What about compounds?
What does pure mean?
How is this different from an compound?
What are some examples of chemical and physical changes?
Separation!
Types of Mixtures:
• Heterogeneous—you can easily see the particles; may have to use a microscope– Suspension: visible particles settle (you can see
them)• Homogenous—contain 2 or more substances
that are blended evenly throughout (you can’t see the particles) – Solution: mixture that never settles and can’t be
seen with a microscope– Colloid: mixture with larger particles than a solution
but still small enough that they don’t settle out
Tyndall Effect:
• Tyndall Effect: the scattering of light by colloidal particles– Link
TYPES IN GREAT DETAIL:
Solutions:
• Solutions:– Particles are so small NEVER settle
out due to how small they are
Make sure that you know what an alloy is..
Know the differences between solutions and colloids
Colloids:
• Colloid:– A mixture in which the particles are
dispersed throughout but are not heavy enough to settle out.
– Small and mixed well but not as good as solution
– Can’t be filtered but scatter light (the particles)
– Examples:• Milk, mayo, and deodorant
What is a colloid?
Suspension:
• Suspension:– A mixture in which the particles are
dispersed throughout and are heavy enough to settle out.
– Scatter and block light• Dirty lake water
– Can be filtered– Examples:• Salad dressing, medicines, paint
What is a suspension?
This snow globe contains solid par- ticles that will mix with the clear liquid when you shake it up. But the particles will soon fall to the bottom when the globe is at rest.
Review:
• How do mixtures differ from elements and compounds?
• How can mixtures be separated?
Homework:
• Vocabulary cards for the following term:– Mixture
Q-tips says, “Q: Why do chemists call
helium, curium and barium the medical
elements? A: Because if you can't
helium or curium, you barium!