Transcript Document

Signs of Chemical Change
DO NOW:
Date: October 14, 2014
TEKS: 6.8B calculate density to identify an
unknown substance
1. Get out your gold Do Now sheet
2. Put your CB and agenda on your desk
3. Write down this week’s HW: “Physical
vs. Chemical Properties HW – due
Friday”
4. Copy this week’s TEKS onto your Do
Now sheet
5. What evidence of chemical change
do you observe in the animated gif
to the right?
October 14,
2014
Ms. Smith
Mrs. Malone
• Homework: Physical
vs. Chemical
Properties HW –
Due Friday
• Announcements:
– Did you turn in your
Mystery Powders
Lab last week? It’s a
major (test) grade
Evidence of Chemical Reaction
Investigation p. __-__ in CB
• Left side:
• Right side:
Chemical 1
Chemical 2
Chemical 1 Name:
Chemical 2 Name:
Properties Before
Reaction:
Properties Before
Reaction:
Evidence of Chemical Reactions
Gas Production
(bubbling, fizz)
Color Change
Temperature Change
(Exothermic – hot or
Endothermic – cold)
Solid Precipitate
Evidence of Reaction Observations
Evidence of
Chemical Change:
Description of new
substance(s)
formed:
Evidence of Chemical Change
October 14,
2013
Ms. Smith
Mrs. Malone
Let’s REVIEW before we begin the investigation!
Chemical changes occur when matter has
changed into a new substance through a chemical
reaction.
 color change
 bubbling and fizzing (gas)
 solid precipitate
 temperature change
:
 endothermic (cold)
 exothermic (hot)
Group Member Roles
October 14,
2014
Ms. Smith
Mrs. Malone
RED - Materials Manager
• Obtains and returns all lab materials
BLUE - Safety/Clean-up Manager
• Enforces all safety rules (wear goggles, waft
odors, broken glass procedures)
YELLOW - Activity Director
• Reads directions to the group
• Keeps group on-task
GREEN - Data Manager
• Ensures all: group members have lab data and
are ready to present
Safety Warning
October 14,
2014
Ms. Smith
Mrs. Malone
For your safety: The proper way to smell odors in
the laboratory is to waft them. Do not put your
face directly over chemicals to smell them!
Practice this technique with me!
:
Signs of Chemical Reaction Lab
October 14,
2014
Ms. Smith
Mrs. Malone
Observations: color, temperature,
state of matter, odor (waft!),
transparent/opaque, texture, etc.
Remember antecedent before pronouns! For example : “The
aluminum was an opaque solid. It was silver in color.”
Materials: lab tray, goggles, beaker labeled #1, beaker labeled #2, beaker
labeled reactant
Procedures:
1.
2.
3.
4.
5.
6.
Record detailed observations of both chemicals
Gently pour the chemical from beaker #1 into the reactant beaker
Gently pour the chemical from beaker #2 into the reactant beaker
Record detailed :observations onto your lab handout
Record evidence of a chemical reaction
Clean-up and be ready to present!
Signs of Chemical Reaction Lab
October 14,
2014
Ms. Smith
Mrs. Malone
Presentations! Each group member should be ready!
1. Give the class your group number
2. Tell the class what you observed about each
reactant chemical (color, temperature, state of matter,
odor, transparent/opaque)
3. Tell the class what you observed about the
product(s) of the reaction (colors, temperature, state
of matter, odor, transparent/opaque)
4. Tell the class which signs of a chemical reaction you
observed (temperature
change, gas produced,
:
precipitate, color change)
Introduction to Density
October 1516, 2014
DO NOW:
Date: October 15-16, 2014
TEKS: 6.6B calculate density to identify an unknown
substance
1. Put your CB on your desk
2. Refer to the Do Now Reading “Reading
Science!: Density”
3. Q?: What was Archimedes discovery, and why
was it important?
Ms. Smith
Mrs. Malone
• Homework:
Physical vs.
Chemical
Properties HW –
Due Friday
Density Cornell Notes – Pre-AP
1. Turn to page __ in your comp book and title it
“Density Notes”
2. Set up your Density Notes page using the Cornell
Notes guide at your table
3. Complete your notes in your composition book
using the Class Set handout
• We will be performing a comparative
investigation about the density of water next, so
take excellent notes!
Density Cornell Notes – Grade Level
1. Turn to page __ in your comp book and title it
“Density Notes”
2. Tape the Density Notes handout into your
composition book on this page
3. Complete your notes on the handout in your
composition book using the Class Set Density
Notes page at your table
• We will be performing a comparative
investigation about the density of water next, so
take excellent notes!
Density of Water Investigation
• Major Grade (Test Grade) – You must collect all data today
• Move 100g rider first, 10g rider second, and use pencil tip to
carefully move 1g rider last.
• Triple beam balance measurements are to the hundredths place
(2 decimal places). The last digit will be estimated (0 if the rider is
right on the line and 5 if it is in between two lines). For example:
134.00g or 134.05g
• Read from bottom of meniscus in graduated cylinders. Each
graduated cylinder is different.
– 50mL and 100mL Each line is 1mL. Read to the ones place and
estimate either 0 or 5 for the tenths place (1 decimal place) For
example: 39.0 mL or 39.5mL
– 250mL  Each line is 2mL. Read to the closest even number and
estimate the ones place. For example: 72mL or 73mL
– 500mL  Each line is 5mL. Read to the closest multiple of 5 and
estimate the ones place. For example: 205mL or 206mL
• Clean up all spills and throw paper towels in the trash (not the
sink, counters, or recycle bin)
Chemical Changes and Density
October 18,
2013
Chemical Change Exit Ticket
1. Complete the “Chemical Change Exit
Ticket”
2. Hand your teacher the exit ticket on
your way out of class
:
Ms. Smith
Mrs. Malone
Ms. Cedillo
Introduction to Density
DO NOW:
Date: October 17, 2014
6.5 D identify the formation of a new substance by using the
evidence of a possible chemical change such as production of a
gas, change in temperature, production of a precipitate, or
color change.
6.6B calculate density to identify an unknown substance
1. Put your CB on your desk
2. Turn in your Physical vs. Chemical
Properties HW
3. Refer to the Do Now “Reading Science!:
Density”
3. Q?: In paragraphs 3 & 4 of this passage,
what clues help you know the meaning of
the word “immersed”?
October 17,
2014
Ms. Smith
Mrs. Malone
• Reminder: Density
of Water lab lab
reports due today