Name CIo.v d i CA
Date
O
0:2 /w/2
Sh Groe::tl:f
Period~
Activity 1.1 What happens when these substances are mixed together?
,.~mo Procedure
1. Squirt water .on a block of wood and place a beaker directly on top of the water.
2. Measure 32 grams of bariutn hydroxide octahydrate and record its temperature.
3. Measure 10 grams of ammonium chloride and record its temperature.
4. Combine the two solids and tnix them well; Record all observations.
5. Record the temperature of the mixture. You tnlght have to take the temperature multiple times to make sure
you get the final temperature.
Observations Before
Substance
-WYl\\"e
Barium
hydroxide
- Loo~ h'lte S ~
Ammonium(wied'1)
-'-'ln,~
chloride
...l:oo~"";)
li\t-e
or 50.\ t
~16-
Observations After
Temp
Before (0 C)
2~
.. ,Clul')'lp irl~
0
(
2~ L
0
-Bubbles -Liqyid iz1fli
·Wetter lrozc
- Smells VI=, RV Sit'~,
,:ihtir:,t
Ii~
~Qrh/am,;n;"m).
Temp
After (0 C)
- I0°C
-10 °C
Materials: Small plastic cup, Plastic Spoon, Calcium Chloride, CaCl2, Thermometer, 10 ml Graduated Cylinder
Procedure - Part A
•
1. Record the temperature of Calcium Chloride using the temperature of the classroom
2. Add 10 ml of water to a small plastic cup
3. Record the temperature of the water in the cup using a thermometer.
4. Add a small spoonful of calcium chloride to the water and swirl the cup, noting observations below.
5. After it has stopped changing, record the temperature of the solution in the cup
Substance ·
Temperature
oc
Po wder and ·Wh i
Calcium Chloride (CaC'2)
Water
CaCl2 & water after mixing
Observations
3011(1
13°C
Cleor
1\(} \Ji
Smell:\
Talk with a partner: What other phenomena have you observed where mixing things of the same temperature
together results in similar types of changes?
Similar Phenomena
What makes it similar?
- Sm-e \I
-Cho.n~e
iY.\
-Li~u IOiz.es
tempercrhn-e
1 • Based on what we know, how and why do we think the tempera ture goes down?
(hem,co_\ Reo.c+,an
2. How would we know if a chemical reaction is happening?
Phfsi coJ ' ch CW19es t hof
in state
COJn
be o'i:r:~rved I chCW13e
of matter
3. Do we have any evidence that combining barium hydroxide and ammonium chloride is a chemical
reaction? What is our evidence?
rnty . exh'ibi+
physical c.V\om~e~ suc.h
m
c,,ho.n~e in
tnCU1g1ra Into a j i q u·, d
(
J
i
, (Appe.o.ro,nc e chon3e. color)
o '5
umperature.,
Planning An Investigation
4. What questions are your class trying to answer with this next investigation?
Who..t hetp~'3 when -sub0;ta.nce~ are
m ·1Ked
tcYfJe-ther-?
5. What data would you need to collect in order to answer each question?
,--;Ttrn pe:ra:tvre Def ':JUb".:>tc;W1ces
Materials
o 10 ml of room
temperature, cool, or
warm water.
6€. I ore C1N1d o..f ter
o 1 spoonful of drink powder
o 1 spoonful of baking soda
o Sandwich baggie
o Thermometer
Procedure - Part B
What additional steps or materials do you need to add to a procedure in order to get all the data you need in
order to answer your question? Create a procedure that includes how you plan to collect data in the steps
below.
1.1 F'-ltt0 rd. if) it-\ o. \ terripercrtures sf 11 ~ub'ito!(lc.es'_1•
Z5°C
JPi 0-c~ drink.
2
pouxier o.n d bak\n
3) Pour w0-ter- into bo.~~i{'... ~rid c\0:>e
0
·into bcr3jiE
l\Od
nxo"<d te.rnpero:\tlre, 0 f
25 °(
21°c
~) iecor d o bser-vations
5) 'OpeY\ 'oo.~Cje
ylaitr
su~t@Ce'.,
.,
-
Observations (Make a data t bl .
,
a e m the space provided to record all of this data you want to collect.)
Dr,nk_
Po'"<ier
2
So.k,n~ Socio.: 250(
W~+#: l~(,
o(
.1,.
M1 x.eQ ,;,0\)"=>+a.'f'Ce.,: 2.\oC
6. What evidence-based claims can we now make in answer to your questions? What is your claim and
what is your evidence for each?
Whtfl su!F.,ta.rce5
Coo occur.
o.re mixed +09)c.-ther, o
Chern1ca\ reocfi0r,
_ 7. Draw a model in the box below that answers the question related to one of the two phenomena you
(.
investigated, "Why did mixing some substances together ot room temperature result in o change in
temperature?" Make sure to include a key for your model. • h,c\\C>'f\
(.
8. How are we defining temperature?