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Agenda
• Separating Mixtures - lab diagrams
• Slip Quiz 1 (New)• Classification of Matter
(Pogil=notes)
• Homework
• Slip Quiz 2
20 Sept 2017
Separating Mixtures: What could we do to separate the mixture of materials we produced during our first lab?
CaCl2(aq) + 2NaHCO3(aq)→CO2(g)+2NaCl(aq)+ CaCO3(s)
gone mixed together
heterogeneous mixturesolution / solid
Filtration (filtering): Copy title and diagramBetween ⅓ and ½ a page in size
Use a ruler
Simple cone filter paper
Filtration (filtering):
Notice: filter funnel not in contact with flask - so air can flow,- use ring and stand.
Also try NOT to let the water reach the top of the filter paper cone.
Now what would we have?
CaCl2(aq) + 2NaHCO3(aq)→CO2(g)+2NaCl(aq)+ CaCO3(s)
gone mixed together
Now what would we have?
CaCl2(aq) + 2NaHCO3(aq)→CO2(g)+2NaCl(aq)+ CaCO3(s)
gone mixed together
Filtrate (in flask) NaCl dissolved in water
Residue (on filter paper) CaCO3 calcium carbonate = chalk,
How could we get the salt out of the water? (homogenous mixture)
Increasing surface area of filter paper in contact with mixture being filtered.How to fold a fluted filter paper https://www.youtube.com/watch?v=u4YeMjbEpIA
Practice folding with scratch paper circles for homework. Part 1. A fault in the fold!
Slip Quiz - A New way to earn Assessment Points
5 points per quiz - 1 or 2 per day
Write in complete sentences. Either write out the question or restate the question in your answer.
Answers with no context lose points.
If we go over in class you may make corrections for full credit. Spelling counts.
Slip Quiz - New way to earn Assessment Points
No make ups for absence,
but there will be extra chances to earn points within 5 week period before the grade finalized for that grading period
Out of 50 points (half a unit test).
“Bank” points over 50.
Slip Quiz - New way to earn Assessment Points
Based on your previous science classes describe and explain what you think the following terms mean:
1) atom
2) molecule
3) element
4) compound
Slip Quiz
Based on your previous science classes describe and explain what you think the following terms mean:
1) atom
2) molecule
3) element
4) compound
Read your response to 1 to your neighbor and then listen as they read their response to you.
Slip QuizBased on your previous science classes describe or explain what you think the following terms mean:
1) atom
2) molecule
3) element
4) compound
Combine both your responses into one more complete response.
Repeat with molecule, element and compound.
Be ready to share with whole class.
Why?
Look at the things in this room. They are all matter. That matter may be pure or it may be a mixture. Can you tell by looking at it? What if you looked at it under a microscope? Then could you tell?
Classification of MatterHow do atoms combine to make different types of matter?
Something that looks pure may not really be pure. It depends on what type of particles an object or substance is made of. In this activity we will explore how the smallest chemical units of matter determine whether something is classified as an element, compound or a mixture.
Classification of MatterHow do atoms combine to make different types of matter?
Model 1
Take a minute to look at the pictures and discuss with your desk partner what the pictures are attempting to represent for us.
Classification of MatterHow do atoms combine to make different types of matter?
Model 1 – Atoms, Particles and Molecules
1. a) RSq molecule – circle one on page 39
b) How many atoms are in a molecule of RSq?
2. a) How many different types of atoms are found in molecule TSq
2R in model 1?
b) How many Sq atoms in a molecule of TSq2R?
Classification of MatterHow do atoms combine to make different types of matter?
Model 1 – Atoms, Particles and Molecules
1. a) RSq molecule – circle on page 39
b) There are two atoms in molecule of RSq (R and Sq).
Classification of MatterHow do atoms combine to make different types of matter?
2. a) TSq2R has three different
types of atoms in one molecule (T, Sq and R)
b) There are two Sq atoms in a molecule of TSq
2R
Classification of MatterHow do atoms combine to make different types of matter?
3. a) How many different types of atoms are found in SqR
3 & TSq ?
b) How many different types of molecules are found in SqR
3 &
TSq?
Classification of MatterHow do atoms combine to make different types of matter?
3. a) A sample of SqR3 and TSq
contains three different types of atom (Sq, R and T).
b) and 2 different types of molecule.
4. When two atoms are touching in the drawings of Model 1, what is holding the atoms together?
Classification of MatterHow do atoms combine to make different types of matter?
4. When two atoms are touching in the drawings of Model 1, a chemical bond is holding the atoms together.
Classification of MatterHow do atoms combine to make different types of matter?
5. a) Can a “particle” be a single atom?
b) Can a “particle” be a molecule?
c) How many particles are in the drawing representing T and RSq and R ?
d) What is your definition of the word “particle” as it is used in chemistry?
Classification of MatterHow do atoms combine to make different types of matter?
5. a) Can a “particle” be a single atom? – Yes.
b) Can a “particle” be a molecule?– Yes.
c) How many particles are in the drawing representing T and RSq and R ? Eight
d) What is your definition of the word “particle” as it is used in chemistry?
Classification of MatterHow do atoms combine to make different types of matter?
5. a) Can a “particle” be a single atom? – Yes.
b) Can a “particle” be a molecule?– Yes.
c) How many particles are in the drawing representing T and RSq and R ? Eight
d) What is your definition of the word “particle” as it is used in chemistry?
A particle is a single atom or a group of atoms that are bonded together as a molecule.
A particle can be a single atom or a molecule ( a group of atoms held together by chemical bonds).
Put a box around or highlight:6. a) R = ? Sq = ? T = ?
b) What do the small numbers (subscripts) in the codes represent?
c) When atoms are touching, how is that communicated in the code?
d) What is the common characteristic of the samples in which an ampersand (&) is used?
e) In Model 1 there are three drawings that are labeled with a question mark. Write codes to properly label these drawings.
Put a box around or highlight:6. a) R = round Sq = square T = triangle
b) The small numbers (subscripts) in the codes represent the number of atoms of that type in a molecule.
c) When atoms are touching, that is communicated in the code using no space between the letters and no “&” in the code.
d) The samples in which “&” is used all contain more than one type of particle.
e) codes?
Put a box around or highlight:6. a) R = round Sq = square T = triangle
e) codes?
Top right box T
Middle left box SqR3
bottom left box R & Sq2
7. Appoint one group member
come up to collect a set of the Model 1 boxes cut apart so you can sort them (put the card to one side for now).
You and your partner sort the drawings into two groups - one group where all the particles are identical and a second group in which the drawings contain more than one type of particle.
We may need to do some redistribution materials.
Read this!
Matter is classified as a pure substance when all of the particles are identical. Matter is classified as a mixture if there are different types of particles present.
8. Identify which drawings from Question 7 are pure substances
and which are mixtures.
Sort them on the card template provided, then write the codes for the drawings in the appropriate places on your own packet.
Pure Substances Mixtures
Pure substances
RTSqR3RSqSq2TSq2R
All Particles Identical
Mixtures
T & RSq & RR & Sq2SqR3 &TSq
More than one type of particle
9. How are the codes (chemical formulas)
for pure substances different from those for mixtures?
9. How are the codes (chemical formulas)
for pure substances different from those for mixtures?
The codes for mixtures have an ampersand (&) in them.
All Particles Identical
RTSqR3RSqSq2TSq2R
Pure substances
10. Take the set of pure substances (left) and sort them into two new groups - using the headings on the other half of the template card.
Elements
RTSq2
Compounds
SqR3RSqTSq2R
12. How are the codes (chemical formulas) for elements different from those for compounds?
Elements
RTSq2
Compounds
SqR3RSqTSq2R
12.
The codes for elements contain only one capital letter.
Only One type of atom
RTSq2
Pure substancesElementsOnly 1 capital letter
Two or more types of atom
SqR3RSqTSq2R
Pure substancesCompounds
Extension Questions Complete questions 15 and 16 carefully and completely.
Homework Part 1.How to fold a fluted filter paper https://www.youtube.com/watch?v=u4YeMjbEpIA
Use website above to teach yourself to fold a fluted filter paper (use scratch paper circles).
Bring in your best fluted-filter paper.
Homework - Part 2 from Textbook
Read Section 3.3 Mixtures of Matter (pp. 66 - 69) and on the back of the Classification of Matter packet take notes using the subheadings in the text to help you organize the notes.
Find a photograph and a lab diagram for the equipment you would use to carry out distillation and print that out if possible - or email to me for printing (may take a while).
Read Section 3.4 Elements and compounds pages 70 - 74 only.
Identify each of the common items below as an element, a compound or a mixtures.
1. a) sugar (C6H12O6)b) Phosphorus (P4)c) Battery acid (H2SO4)d) Air (N2 & O2 & CO2 & Ar &...)e) Salt water (NaCl & H20)
Slip Quiz 2 (Copy names and formulas first)
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