Name: ________________________________
Period: ___
Review Worksheet for Physical/Chemical Properties and
Changes, Chemical Reactions, and Heating Curve of Water
1. What are 5 characteristics of physical properties?
a.
b.
c.
d.
e.
2. What are 5 characteristics of chemical properties?
a.
b.
c.
d.
e.
3. What kind of properties describe what a substance is like?
4. What kind of properties describe how a substance reacts with another substance?
5. As matter changes, it will either _________________ or _______________ energy.
6. What is one common indication that energy has been absorbed or released?
7. What is the difference between an endothermic and an exothermic reaction?
8. What do the graphs look like for endothermic and exothermic reactions?
9. What kind of reaction usually occurs when food is cooked?
10. Give an example of an endothermic reaction.
11. Give an example of an exothermic reaction.
12. Why is it difficult to start and maintain some chemical reactions?
13. What is needed to start a chemical reaction?
14. What type of reaction gives off energy?
Name: ________________________________
Period: ___
15. What type of reaction takes in energy?
16. Label the heating curve of water with: solid, liquid, gas, melting, boiling, melting point and
boiling point.
17. How would a heating curve graph change if water was heated more rapidly?
18. If I mix vinegar and baking soda and get a cloudy liquid, what are my products and what are my
reactants?
19. What are the reactants in the following equation: 6 CO2 + 6 H2O
C6H12O6 + 6O2
20. What does the term “balanced equation” mean?
21. What is the Law of Conservation of Mass?
22. A student puts out fire on the stove by dumping baking soda on the flame. How has the student
used scientific knowledge in his daily life?
23. Describe two ways you know that cooking an egg (or most other foods) results in a chemical
change.
24. What are two differences between chemical and physical changes?
25. Describe the difference between a chemical and a physical property. Give an example of each.
Name: ________________________________
Period: ___
26. A chemical change occurs when an egg cooks. What effect does the chemical change have on
the physical properties of the egg?
Use the following information to answer the four questions below:
Students added vinegar to baking soda and collected the gas. They timed how much gas formed in 30
seconds to measure the speed of the reaction. Then they tried three additional tests. Each test was
repeated 4 times.
Test
Baking
soda
Vinegar
Conditions
Average amount
of gas formed in
30 seconds.
1
1 gram
20 mL
25C all reactants
70 mL
2
1 gram
40 mL
25C all reactants
80 mL
3
2 grams
20 mL
25C all reactants
70 mL
4
1 gram
20 mL
Vinegar heated to 60C
100 mL
27. Which test should be considered the control?
28. Which variable was changed in test #2?
29. What should the students conclude about changing the amounts of reactants?
Changing the amount of reactants…
30. What should the students conclude from the #4 test?
Use the following information to answer the next 3 questions:
Gold
Gold is the most malleable metal. A single gram can be beaten into a sheet of one square
meter. Gold leaf can be beaten thin enough to allow light to shine through it.
Gold is a good conductor of heat and electricity, and is not affected by air and other
chemicals. Heat, moisture, oxygen, and most corrosive agents have very little chemical
effect on gold, making it useful for use in coins and jewelry. Because of its low reactivity,
pure, metallic gold is tasteless.
In addition, gold is very dense, a cubic centimeter weighing 19.3 g. By comparison, the
of lead
is 11.3of
g/cm³.
31. Whatdensity
is a chemical
property
gold?
32. Thin sheets of gold are often used to cover clay statues to create the appearance of the statue
being made of solid gold. Which property of gold allows it to be used this way?
33. Which properties of gold make it valuable for use in computers and satellites?
Name: ________________________________
Period: ___
Use the following data to answer the next two questions.
An experiment with rock salt used three beakers. Each had 100 ml of water and 25 g of salt added.
Beaker A was left alone and Beaker B and C were changed. The time needed to dissolve the salt was
measured.
Beaker
Change
Time to dissolve
A
None
6 hours (360 minutes)
B
Stirred with spoon
8 minutes
C
Heated on hot plate
25 minutes
34. What is the best question for this experiment?
35. How can you sum up this experiment?
Use the following chart to answer the next 2 questions:
Properties of 4 substances
Substance
Density
Phase at room
temperature
Reaction with water
Reaction to
flame
Hydrogen Gas
.00009 g/ml
Gas
None
Burns
explosively
Sodium
.97 g/ml
Solid
Violent bubbling
reaction
Burns
explosively
Carbon
2.2 g/ml
Solid
None
Burns slowly
Argon
.002 g/ml
Gas
None
None
36. Which substance showed no chemical change?
37. Which of the tests measured physical properties?
38. Pick a substance you are familiar with and describe a physical property and a chemical property
of that substance. Be sure to tell me what that substance is.