STUDY GUIDE: Properties and Changes
Name:
Quiz Date:
For the quiz, you will be assigned a partner. You will work with that
partner to complete a lab. Then, you will work individually to answer
questions about the lab. You will be graded on your ability to follow
directions, your laboratory skills, the quality of your written work, and the
following learning targets:
Learning Target:
I can
I can,
with
help
No idea
1. I can distinguish between properties and changes.
2. I can classify properties as physical or chemical.
3. I can identify characteristic properties. (We have seen this in past units.)
4. I can identify and recognize the clues of chemical change.
5. I can distinguish between physical and chemical changes.
6. I can state the Law of Conservation of Mass and explain how it applies to
physical and chemical changes.
7. I can count the number of atoms in a chemical formula.
8. I can determine whether a chemical equation is balanced or not.
Relate each of the following terms to physical property, physical change, chemical property, or
chemical change using a short statement. First one done for you as an example.
State of Matter is a type of physical property. There are multiple examples within this type – solid, liquid, gas, plasma – each of
which is a specific physical property. Other types of physical property relate to appearance and behavior.
Change of State of Matter – type of physical change, specific examples boiling, evaporation, etc
Chemical Reaction – another name for chemical change, makes something new
Dissolve – physical change; nothing new made
Soluble – means dissolvable, so ability to dissolve, physical property
React – to change chemically into something new = chemical change
Reactivity – ability to react or how much something reacts, chemical property
Rusting – metals combining chemically with oxygen to make a new compound; CC
Burning – substance combining chemically with oxygen; obvious flame (heat and light
released) = chemical change
Characteristic Property – This part OPTIONAL.
Definition – a property/characteristic of a substance that can be used to identify that
substance because it does not change for that substance with amount, shape
Examples – density, boiling point, melting point
How does Characteristic Property relate to this unit? If you are ready for more of a challenge, I
would like you to think more about this
Look up and write definitions for: NOT OPTIONAL
Physical Property: any characteristic of a material you can observe without changing
the identity of the substance; describes appearance or behavior of a material
Chemical Property: a property used to characterize materials in reactions that change
their identity
Identify each of the following as a Physical Property (PP), Physical Change (PC),
Chemical Property (CP), or Chemical Change (CC)
1.
CP
combustible
2.
PC
zinc melting
3. PP
5.6 mL
4. __CP__ability to rust
5. __PP___ texture
6. __PP__ brittle
7.
8.
Flammability
9.
Purple
12.
CC ring stand rusts
15.
PP 15 g
CC
food is digested
CP
10.
PP __ density
11.
PP
13.
PP _ ability to dissolve
14.
CC tooth rotting
16. __PP__ solid
17. ___PP_ odor
19. __PC___ melting a candle
20.
PP
boiling point
18. __PC__ salt dissolving
CC 2 Mg + O2 --> 2 MgO
21. Carefully study questions 1-20 and circle the characteristic properties. (OPTIONAL)
#9 and 10
22. List all five clues that indicate a chemical change or chemical reaction might have occurred.
___Produce a new or different smell_________________________
___Produce a new or different color_____________________________________________
___Release or absorb energy (heat, light, sound) ___________________________
___Produce a new gas (can see in bubbles) in liquids ______________________________________
___Produce a new solid (precipitation) in liquids where no previous solid present _______________
Examine the picture of a Coke can crushed and answer the following questions 23-25:
23. List three physical properties of this can.
Red, grey/silver, mixed smooth and jagged texture, mass (we don’t
know what it is but we know it has mass), volume (same as for mass),
density (same as for mass)
24. Compared to a new Coke can, did the can pictured undergo a chemical or
physical change? Please explain.
This can appears to have undergone a physical change – it was crushed. The material is the
same, but the appearance (shape) has changed.
25. How would you predict the density of the metal in the can compares before and after the change?
Because the can appears to have undergone a physical change only, it is the same
material as before crushing, so the density of the can metal should not be changed. Its mass
has not changed, nor has the volume of the can metal itself. Overall volume has decreased
due to crushing, but that volume included air.
“Reading” a Chemical Equation
Answer questions 26-29 based on the following reaction
Ca(OH)2 (s) + Al2(SO4)3 (aq)
à
CaSO4 (s) +
26. Which of the following is a product?
(A) Ca(OH) 2 (s)
(B) Al2(SO4) 3 (aq)
Al(OH)3 (aq)
(C) CaSO4 (s)
(D) the arrow
27. Write one reactant.
Either Ca(OH)2 or Al2(SO4)3
28. What is the meaning of (s) after CaSO4?
It means the CaSO4 (calcium sulfate) is in the solid state.
29. The Law of Conservation of Mass says that the total starting mass of all reactants equals
___the total ending mass of all products_. For this specific reaction, what masses should be
equal to each other according to this Law.
The mass of (Ca(OH)2 + Al2(SO4)3 ) should equal the mass of (CaSO4 + Al(OH)3).
In the equation
NiCl2 + 2NaOH
1
30. The first “2” affects
a) Ni only
à
Ni(OH)2 + 2NaCl
2
3
b) Cl only
c) Ni and Cl
31. The second “2” affects
a) Na only
b) Na and O
c) Na and O and H
32. The third “2” affects
a) Ni only
b) O only
c) O and H
d) Na, O, H, and Ni(OH)2
d) Ni and O and H
Determine the total number of atoms present in each of the following.
33. SiO2 = 1 Si + 2 O = 3 atoms total
34. NaCl – 1 Na + 1 Cl = 2 atoms total
35. K3PO4 = 3 K + 1 P + 4 O = 8 atoms total
36. Ca(OH)2 = 1 Ca + 2 O + 2 H = 5 atoms total
37. (NH4)2SO4 = 2 N + 8 H + 1 S + 4 O = 15 atoms total
38. 2 Fe(OH)3 = 2 Fe + 6 O + 6 H = 14 atoms total
Balanced OR NOT?
39. Is the following equation balanced? H2SO3 (aq)
→ H2O (l) + SO2 (g)
Yes, every element is balanced = the same number on each side of the arrow
40. Is the following equation balanced? Fe + O2
→ 2 FeO
No, there is one Fe on the reactant side but 2 Fe on the product side