elements, compounds & mixtures spring 2012
TRANSCRIPT
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You Will Need:1.Pencil, Colored pencils2.Assignment Log #3 – Update
w/new assignment3.Elements, Compounds and
Mixtures – 1sheets 2 sides – Part 1
4. Textbook
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1. Elements are pure substances made of only one kind of atom.
2. As we have learned, atoms are tiny structures found in all matter.
3. Most substances contain many different atoms.
4. It is how those atoms are arranged that determine whether you have an element, compound or mixture.
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1. One kind of atom2. Pure (because all particles are
the same)
3. Smallest particle to retain identity of the element
4. Separated only in nuclear reactions
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Particles look like:
Every atom looks exactly
the same w/ the same number of
protons
Oxygen
Hydrogen
11
1
88
8
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Example:
Your Example?
Aluminum: Every atom of
aluminum in this can is exactly
the same
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1. Two or more kinds of atoms chemically bonded
2. Pure (because all particles are the same)
3. Smallest particle to retain the identity of the compound (SET RATIO of particles)
4. Separated or rearranged in chemical reactions CO
2
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Particles look like:
Every atom looks exactly
the same w/ the same set ratio
Carbon Dioxide – CO2
Sodium Chloride - NaCl
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Example:
Your Example?
Salt: Every molecule of the compound NaCl is exactly the
same
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1. Two or more elements and/or compounds blended together physically
2. Not pure (because all the particles are not the same)
3. Separation through distillation, magnetic, evaporation, density
4. No set ratio
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Particles look like:
Each particle keeps its own
identity….they are just “blended”
together
Mixture #1
Mixture #2
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Examples:
Your Examples?
Heterogeneous: Different components are easy to see in
this type of blending
Homogeneous: Different components are difficult to see
because they are evenly distributed
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Compound
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Mixture
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1. A solution is a mixture where all the components blend together to look like one substance.
2. A solution is a homogeneous mixture that appears to be a single substance.
3. The solution is composed of particles of two or more substances that are distributed evenly among each other and have the same appearance and properties throughout.
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1. In solutions, the SOLUTE is the substance that is being dissolved and usually is the smaller quantity in the mixture.
2. The SOLVENT is the substance in which the solute is dissolved and usually is the larger quantity in the mixture.
3. It is the SOLVENT that is doing the dissolving.
4. Go to page 144-145 in your textbook: Give examples of solutions in various states.
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• Homogeneous: 2 or more things evenly blended and disappear into each other.
• Solute – Smaller quantity
• Solvent – Larger quantity
• Solution – a homogeneous mixture
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• Heterogeneous: 2 or more things put together and still can be seen.
• No set RATIO.
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1. We now know the definition of Element, Compounds & Mixtures
2. What do their particles look like?
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1. Elements, Compounds & Mixtures – Sides 1 & 2 complete by Monday, April 9th
2. STAR Cards 61-100 – Due Friday, April 13th
3. ENJOY your Spring Break!