Blue Science Portfolio (4)

Blue Science
Portfolio
2017-2018

By: Theresa Jamele

Table of Contents

Title Page ~~~~ 1
Table of Contents ~~~~ 2 - 4

Scientific Method​ ~~~~
Introduction
Textbook Roll Using Pencils
Scientific Method Practice Readings
Scientific Method Quiz
Scientific Method Test

Metric System ​~~~~
Introduction
Metric System Quiz

Density​ ~~~~
Introduction
Density Lab Report
Density Quiz

3 Unit Test - Scientific Method, Metric System and Density -

Phase Changes​ ~~~~
Introduction
Phase Change of Water
Phase Changes Quiz

Atomic Structure​ ~~~~
Introduction

Atomic Structure Notes - Periodic Table and Trends -

Isotopes​ ~~~~
Introduction
Fossils and its Percents
M&M Experiment
Isotopes Quiz

Velocity​ ~~~~
Introduction
Velocity Story
Velocity Project

Gravitational Potential Energy​ ~~~~
Introduction
Gravitational Potential Energy Project
GPE/KE Quiz

Classifying Matter​ ~~~~
Mixture Lab
Classifying Matter Quiz

Science Portfolio Reflection 2018 ~~~~ 101

What is Scientific Method?

The scientific method is a “method of procedure consisting in
systematic observation, measurement, and experiment, and the

formulation, testing, and modification of hypotheses.”

In this unit we learned all about testing experiments many times
through just like scientists do. We also learned about independent and

dependent variables, as well as control, constants and graphing and
making data tables. Lastly, we learned about writing problem
statements, a hypotheses, and clear conclusions.

Textbook Roll Using Pencils

Experiment: Textbook roll using colored pencils

Hypothesis: If the pencils arranged touching altogether, then
the book the will roll the farthest because of the the friction
between the pencils and the floor.

Problem Statement: How does the arrangement of pencils
affect the distance of the textbook at it is pushed.

Independent Variable (IV): Arrangement of the colored pencils

Levels of IV: Touching altogether, 2 cm apart, 5 cm apart,
pushing the book with no pencils

Dependents Variable (DV): Distance the textbook rolled

Control: Pushing the textbook without any pencils

Constants: Same person pushing the textbook, same amount of
pencils, same textbook, same amount of force on the textbook

Data Table:
Graph:

Reading Practice

Story: Jim, Jody, and Juan, all sixth graders, love to play tennis and are
interested in forming an interscholastic tennis team. To do so, they
decide to hold tennis practice sessions during Period H every day. Mr. S
and Mr. P agree to hold tryouts at the end of October. Seeing as how
this was their idea, Jim, Jody, and Juan want to make sure that they will
make the team. To ensure their placement on the team, they test to
see which brand of tennis ball helps produce the fastest serve. Jim,
Jody, and Juan believe that if they determine the ball that produces the
fastest serve, they will definitely make the tennis team because they
will have an advantage over the other players.

Reminder: They all think that brand X tennis balls will bounce the
highest because they are the hardest to squeeze. Using brand X, Y, and
Z tennis balls, they decide to drop each ball from 15 meters above the
ground onto a clay tennis court. They measure the height that each ball
bounces and record this value in their data table. Jim, Jody, and Juan
complete 5 trials for each tennis ball and record an average height in
their data table.

What is the independent variable in the experiment?
Type of tennis ball

What is the dependent variable in the experiment?
Height the ball bounces

According to the passage, what was their hypothesis?
If they tested the three tennis balls then brand X’s tennis balls height
will increase because it’s the hardest tennis ball.

Name 3 constants involved in the experiment
1. Same height
2. Same tennis court
3. Same amount of trials for each tennis ball

Scientific Method Quiz

Mr. Smithers believed that Caffeine may make people more alert. Mr.
Smithers tested 100 people by using their scores in the same video
game. Devin had 3 different brands of drinks with 10 g, 20 g, and 30 g
of caffeine respectively. He measured their scores on a video game
that had a range of 0-1000 points. Some of the players were not given
caffeine drinks. Help Mr. Smithers design an effective experiment and
write a conclusion that analyzes your results.

Problem Statement

Will different amounts of caffeine make people playing video games
more alert?

Hypothesis

If the type of caffeinated drink is tested, then the 30 g of caffeine will
work the best because it has more caffeine and will alert you more.

Independent Variable
Number of grams of caffeine in each drink

Dependent Variable
Amount of points

Constants Same people drinking the same
Same people drinking the drinks drink throughout experiment

Control
No caffeine

Basic Procedures​:
- same 100 people testing the caffeine
- different amount of caffeine
- same location
- same person with the same drink
- same amount of grams
- same video game
- range of points (0-1000)

Table:

Graph:

Conclusion:​ In conclusion, the caffeinated drink that worked the best
was the drink with 30 grams because it had more caffeine in it and had
25 out of the 25 people affected. The drink that had the least effect on
people was not drinking any caffeine and the drink with 10 grams.
Some people had an effect with 10 grams but the majority of people
did not. The drink with 20 grams had many people alert but not as
many as with the 30 grams drink. Altogether 48 out of 100 people were
affected. By looking at the results, testing the same people based on
how much caffeine they drink will affect how alert you become.

Scientific Method Test

1. A scientist conducted an experiment to determine how the amount
of salt in a body of water affects the number of plants that can live in
the water. In this experiment the dependent variable is
_____________.
the amount of salt in the water
the temperature of the water
the number of plants in the water
the water

2. A scientist hypothesizes that the temperature at which an alligator's
egg is incubated will determine whether the alligator will be male or
female. The independent variable is ____________.
the gender of the alligator
the incubator
the temperature
the male alligators

3. In an experiment, the factor that we measure and is on the Y-axis is
called the ____________.
independent variable
dependent variable
conclusion
Constant

4. In an experiment, the one variable that is changed by the
experimenter is called the _____________.
independent variable

dependent variable
experimental variable
Constant

5. If you were measuring the mass of a fly, you should use
____________.
meters
grams
kilograms
Liters

6. If you wanted to know the volume of water in a small can of soda,
you would use ______________.
milliliters
pounds
Liters
Kilograms

7. A scientist who wants to study the effects of fertilizer on plants sets
up an experiment. Plant A gets no fertilizer, Plant B gets 5 mg of
fertilizer each day, and Plant C gets 10mg of fertilizer each day. Which
plant is the control?
Plant A
Plant B
Plant C
None

8. Victoria grows the same bacteria in 20 petri dishes. She places 10 of
the dishes in a container with a normal atmosphere. The remaining

dishes she places in a container in which the oxygen level is double the
normal level. She labels the first group "A" and the second group "B".
Which of the following best describes the groups?
Group A is the control group; Group B is the experimental group
Group A is the experimental group; Group B is the control group
Group A is the hypothesis; Group B is the theory
Group A is the control group; Group B is the observation
Group A is the theoretical group; Group B is the hypothetical group

9. Homer notices that his shower is covered in a strange green slime.
Homer decides to spray half of the shower with coconut juice thinking
this will kill the slime. He sprays the other half of the shower with
water. After 3 days of "treatment" the green slime on the coconut juice
side of the shower dies. The dependent variable in his experiment is
_______.
coconut juice
there is no dependent variable
the amount of the green slime
Water

10. For an experiment, a scientist put lime at the base of tomato plant
A and baking soda at the base of tomato plant B. She then sealed the
plants in plastic bags. Tomato plant A eventually died, and tomato plant
B stayed healthy. What is the Independent Variable in this experiment?
the types of plant grown for the test
the response of the plants to each substance
the substance at the base of each plant
the plastic bags wrapped around each plant

11. I am trying to clean my bathroom because it has mold on the
bottom. I was told to use oxy clean to get it up. I use oxyclean on half of
the bathroom and water on the other half. The control is:
water
oxy clean
bathroom
Time

12. A scientist plants two rows of corn for experimentation. She puts
fertilizer on row 1 but does not put fertilizer on row 2. Both rows
receive the same amount of water and light intensity. She checks the
growth of the corn over the course of 5 months. What is a constant in
this experiment.
Amount of water
Corn without fertilizer
Corn with fertilizer
Plant height

13. A student wants to conduct an experiment to find out how pulse
rates changes as the length of time spent exercising increases. The
dependent variable will be _____.
breathing rate
pulse rate
time spent exercising
the kind of exercise

14. A student hypothesized that the amount of sunlight a sunflower

plant receives determines the number of sunflower seeds the plant
produces. In her experiment, the number of seeds produced is the ___.
dependent variable
independent variable
constant
Control

15. In a controlled experiment, the independent variable is ____.
the results of the experiment - it goes on the y-axis
the variable that stays the same
changed to test the hypothesis - it goes on the x-axis
always time

16. Sarah wanted to find out if temperature has an effect on the growth
of bread mold. She grew the mold in nine Petri dishes containing the
same amount and type of nutrients. Three were kept at 0 C, three were
kept at 90 C, and three were kept at room temperature, 27 C. The
containers were examined and the growth of the bread mold was
recorded each Friday for five weeks. Which of the following is her
hypothesis?
If there are different types of nutrients used, then that will cause
differences in the amount of bread mold.
If the amount of nutrients is changed, then the amount of bread mold
will change.
If the temperature changes then the amount of bread mold will
change.
If the number of containers change, then the amount of bread mold
will change.

17. Sarah wanted to find out if temperature has an effect on the growth
of bread mold. She grew the mold in nine Petri dishes containing the
same amount and type of nutrients. Three were kept at 0 C, three were
kept at 90 C, and three were kept at room temperature, 27 C. The
containers were examined and the growth of the bread mold was
recorded each Friday for five weeks. The independent variable is:
growth of bread mold
temperature of the containers
number of containers at each temperature
amount of nutrients in each container

18. What is the independent variable in the experiment found?
the intensity or brightness of the light
color of the light
the amount of water received weekly
the temperature of the room

19. In the experiment found on the link, all of the following variables
must be held constant EXCEPT
the intensity or brightness of the light
amount of time given light
the temperature of the room
color of the light

20. An unknown substance from planet X has a density of 10 g/mL. It
occupies a volume of 80 mL. What is the mass of this unknown
substance?

0.8 g
21.0 g
523 g
800 g

21. A graduated cylinder has 22 mL of water placed in it. An irregularly
shaped rock is then placed in the graduated cylinder and the volume of
the rock and water in the graduated cylinder now reads 30 mL . The
mass of the rock is 24 g. What is the density of the rock?
72 g/cm3
5 g/cm3
12 g/cm3
3 g/cm3

22. A rectangular solid of unknown density is 5 cm long, 2 cm high, and
4 cm wide. The mass of this solid is 300 grams. Given this information
for this homogeneous material, calculate the density.
12,000 g/cm3
7.5 g/cm3
57 g/cm3
120 g/cm3

23. Silver has a density of 10.5 g/cm3 and gold has a density of 19.3
g/cm3 . Which would have a greater mass, 5 cm3 of silver or 5 cm3 of
gold?
Gold
Silver
Aluminum
Same mass

24. A 28.5 g of iron is added to a graduated cylinder containing 45.5 mL
of water. The water level rises to the 49.1 mark. Calculate the density.
7.92 g/cm3
15.6 g/cm3
325 g/cm3
100 g/cm3

25. 43.2 m = ________ mm
4.32
0.432
43,200
0.0432

26. 8700 mL = ________ L
870.0
8.7
0.087
87,000

27. 5.9 km = _______ m
0.059
59
5,900
59,000

28. 756.0 cg = _____ g
7.56
75,000

756
0.0756

29. 23,000 mm = _______ m
2.3
23.0
230
2300

30. Metric Unit for Mass
LITERS
METERS
GRAMS
SECONDS

31. Metric Unit for Density of a Solid
g/cm
g/mL
g/cm3
cm/g

32. Metric Unit for Density of a Liquid
mL/g
cm3/g
g/cm3
g/mL

33. Which appliance is used twice as many hours on the weekends as it
is on weekdays?

Lights
TV
Computer
Fridge

34. On average, how many hours is the computer used on a weekday?
1
2
5
8

35. Which 2 objects are the same substance?
1 and 2
2 and 3
1 and 4
1 and 3

What is the Metric System?

The metric system is “a internationally adopted decimal system of
measurement. the decimal measuring system based on the meter, liter,

and gram as units of length, capacity, and weight or mass.
(K. H. D. U. D. C. M.)

In this unit I took notes with charts about each of the 7 units of
measurement in my notebook. We learned how measure didn’t things
around the room and how to convert a unit to another unit by dividing

and multiplying a by 10.

Metric Quiz

34.2 cm = ____ m
Answer: 0.432 m
4500.0 mg = ___ g
Answer: 4.5 grams

7.2 L = ____mL
Answer: 7200 mL

2.35 km = _____m
Answer: 2350 m

8600.0 m = ___ km
Answer: 8.6 km

What is Density?

Density is a “volumetric mass density, of a substance is its mass per unit
volume.” Meaning, how much of something takes up something, like
storage.

In this unit I learned how to weigh things and use calculations and
determine different objects of materials and compare and contrast

them to other materials.

Density Lab & Spreadsheet

Volume

Volume Volume Object Density

Object Mass (g) Before (mL) After (mL) (cm3) (g/cm3)

A 67.8 40 48 8 8.48

B 267.5 ---- ---- 29.79 8.98

C 72.1 40 48 8 9.11

D 28.4 40 43 3 9.46

E 28.9 40 44 4 7.22

F 28.9 40 44 4 7.23

G 21.9 40 48 8 2.74

H 29.4 40 50 10 2.94

Unknown Volume Volume Volume Density

Objects Mass (g) Before After Object (g/cm3)

1 29 40 43 3 9.67

2 29.3 40 44 4 7.33

3 267.5 ------ ------ 29.79 8.98

4 68.5 40 48 8 8.56

5 29.3 40 44 4 7.33

6 29.8 40 51 11 2.71

7 72.5 40 48 8 9.06

8 22.4 40 48 8 2.8

A. Problem Statement:
How can density be used to identify unknown metals?

B. Hypothesis:

If density is known then the unknown metals can be correctly
identified because every metal has its own density.

C. Independent Variable: Different types of metals
Levels of IV

Copper Tin Bronze Brass Zinc Copper Aluminum

D. Dependent Variable:
Density (g/cm3​ ​)

E. Constants: Balance/Unit Procedures

Amount/volume
of water

F. Control:
Water (The density of water is)

G. Materials:
1. Graduated Cylinder to put water in
2. Dropper to put extra water droplets in the cylinder
3. 40 mL of water which was always our starting point

4. Beaker to hold water until we started pouring it in the cylinder
5. Triple Balance Beam to weigh metals
6. Different Metals to measure
7. Calculator to find the answer
8. Computer to write down results
9. Flat surface to keep everything balanced/evened

H. Procedures:
1. Weighed metal on the triple balance beam
2. Put 40 mL of water into the graduated cylinder
3. Put each metal into the water
4. Read measurements
5. Filled out the chart based on results

In conclusion, this experiment was done to find out how density
can be used to identify unknown metals. Some errors that occurred in
my experiment was that the water may have not been exactly at 40 mL
and the triple balance beam may have not been exactly calibrated at
the line. Although, there were some minor errors they were still minor
enough to have accurate calculations. Some of the accurate
calculations was when I matched each number to letter based on the
closets density. I was able to identify them because Aluminum had the
volume of 8cm3​ ​ and then I divided it by the mass which was 21.9 grams
and the density ended up being 2.74g/cm​3,​ based on that result, I was
able to figure what each metal was by doing the same equations.

Density Quiz

Density of an object:

Mass divided by the volume D = m/v
Volume divided by the mass D = v/m
Same as its weight
Same as the size of the object

If two objects have the same volume but one has a greater mass, the
one with greater mass

has a lower density
has a higher density
will float
will sink

If two objects have the same volume but one is made up of smaller and
heavier atoms, the one with small heavy atoms will

be larger than the other
are less dense than the other
be more dense than the other
have the same density

If you cut a wooden block in half, each half would have

half the density of the original piece
twice the density of the original piece
the same density as the original piece
no density at all

If two objects have the same mass but different volumes

the one with the larger volume has the lowest density
they must have the same density
the one with the larger volume has the higher density
the one with the larger volume is twice as dense.

If the density of water is 1 gram/cm3, this means that the mass of 100
cm3 of water should be

100 grams
50 grams
1000 grams
1 gram

Density is a characteristic property of a substance. This means that the
density of water

changes depending on the volume
stays the same regardless of the volume
is greater for a greater mass of water
is less for a smaller mass of water

Woof floats in water. If you measured the mass of the same volume of
wood and water

the water would have a greater mass
the water would have a lower mass
the mass of the wood and water would be the same
the mass of the w’
wood and water would both be 100 grams

A carrot floats in salt water but sinks in freshwater. This is because

salt water is more dense than freshwater
fresh water is more dense than salt water
the carrot is more dense than salt water
a larger piece of carrot has a different density

A tiny piece of sand is very light but sinks in water. This is because

sand is a solid
sand is less dense than water
there is more water than sound
sand is more dense than water

The density of hot and cold water are different mainly because

the molecules in hot water move slower and are slightly colderr
together
the molecules in hot water are larger

the molecules in hot water move faster and are slightly further apart
the molecules in cold water move faster and are further apart

Pure Gold has a Density of 19.32 g/cm3. How large would a piece of
gold be if it had a mass of 318.97 g?

26.5 cm3
36.5 cm3
16.5 cm3
0.06 cm3

Calculate the density of sulfuric acid if 35.4 mL of the acid is 65.14 g.
6.35 g/mL
1.84 g/mL
10.75 g/mL
25 g

28.5 g of iron hot is added to a graduated cylinder containing 45.5 mL
of water. The water level rises to the 49.10 mL mark. From this
information, calculate the density of iron.

8.5 g/cm3
18.75 g/cm3
29 g/cm3
7.92 g/cm3
50 g

3 Unit Test:

1. A scientist conducted an experiment to determine how the amount
of salt in a body of water affects the number of plants that can live in
the water. In this experiment the dependent variable is ______

amount of salt in the water
temperature of the water
number of plants in the water

the water

2. A scientist hypothesizes that the temperature at which an alligator's
egg is incubated will determine whether the alligator will be male or

female. The independent variable is ___________

gender of the alligator
incubator
temp

male alligators

3. In an experiment, the factor that we measure and is on the Y-axis is
called the ________

independent variable
dependent variable

conclusion
constant

4. In an experiment, the one variable that is changed by the
experimenter is called the ____________

independent variable
dependent variable
experimental variable

Constant

5. If you were measuring the mass of a fly, you should use ___________

meters
grams
kilograms
liters

6. If you wanted to know the volume of water in a small can of soda,
you would use ______________.

milliliters
pounds
Liters
Kilograms

7. A scientist who wants to study the effects of fertilizer on plants sets
up an experiment. Plant A gets no fertilizer, Plant B gets 5 mg. of

fertilizer each day, and Plant C gets 10mg. of fertilizer each day. Which
plant is the control?

Plant A
Plant B
Plant C
None

8. Victoria grows the same bacteria in 20 petri dishes. She places 10 of
the dishes in a container with a normal atmosphere. The remaining

dishes she places in a container in which the oxygen level is double the
normal level. She labels the first group "A" and the second group "B".

Which of the following best describes the groups?

Group A is the control group; Group B is the experimental group
Group A is the experimental group; Group B is the control group

Group A is the hypothesis; Group B is the theory
Group A is the control group; Group B is the observation
Group A is the theoretical group; Group B is the hypothetical group

9. Homer notices that his shower is covered in a strange green slime.
Homer decides to spray half of the shower with coconut juice thinking

this will kill the slime. He sprays the other half of the shower with
water. After 3 days of "treatment" the green slime on the coconut juice

side of the shower dies. The dependent variable in his experiment is
_____________.

coconut juice
there is no dependent variable
the amount of the green slime

water

10. For an experiment, a scientist put lime at the base of tomato plant
A and baking soda at the base of tomato plant B. She then sealed the
plants in plastic bags. Tomato plant A eventually died, and tomato plant
B stayed healthy. What is the Independent Variable in this experiment?

the types of plant grown for the test
the response of the plants to each substance

the substance at the base of each plant
the plastic bags wrapped around each plant

11. I am trying to clean my bathroom because it has mold on the
bottom. I was told to use oxy clean to get it up. I use oxyclean on half of

the bathroom and water on the other half. The control is:

water
oxy clean
bathroom

Time

12. A scientist plants two rows of corn for experimentation. She puts
fertilizer on row 1 but does not put fertilizer on row 2. Both rows

receive the same amount of water and light intensity. She checks the
growth of the corn over the course of 5 months. What is a constant in

this experiment.

Amount of water
Corn without fertilizer

Corn with fertilizer
Plant height

13. A student wants to conduct an experiment to find out how pulse
rates changes as the length of time spent exercising increases. The

dependent variable will be _____.

breathing rate
pulse rate

time spent exercising
the kind of exercise

14. A student hypothesized that the amount of sunlight a sunflower
plant receives determines the number of sunflower seeds the plant
produces. In her experiment, the number of seeds produced is the

_____.

dependent variable
independent variable

constant
Control

15. In a controlled experiment, the independent variable is ____.

the results of the experiment - it goes on the y-axis
the variable that stays the same

changed to test the hypothesis - it goes on the x-axis
always time

16. Sarah wanted to find out if temperature has an effect on the growth
of bread mold. She grew the mold in nine Petri dishes containing the

same amount and type of nutrients. Three were kept at 0 C, three were
kept at 90 C, and three were kept at room temperature, 27 C. The
containers were examined and the growth of the bread mold was
recorded each Friday for five weeks. Which of the following is her
hypothesis?

If there are different types of nutrients used, then that will cause
differences in the amount of bread mold.

If the amount of nutrients is changed, then the amount of bread
mold will change.

If the temperature changes then the amount of bread mold will
change.

If the number of containers change, then the amount of bread mold
will change.

17. Sarah wanted to find out if temperature has an effect on the growth
of bread mold. She grew the mold in nine Petri dishes containing the

same amount and type of nutrients. Three were kept at 0 C, three were
kept at 90 C, and three were kept at room temperature, 27 C. The
containers were examined and the growth of the bread mold was
recorded each Friday for five weeks. The independent variable is:

growth of bread mold
temperature of the containers
number of containers at each temperature
amount of nutrients in each container

18. What is the independent variable in the experiment found in the
link below?

the intensity or brightness of the light
color of the light

the amount of water received weekly
the temperature of the room

19. In the experiment found on the link, all of the following variables
must be held constant EXCEPT

the intensity or brightness of the light
amount of time given light

the temperature of the room
color of the light

20. An unknown substance from planet X has a density of 10 g/mL. It
occupies a volume of 80 mL. What is the mass of this unknown
substance?

0.8 g
21.0 g
523 g

800 g

21. A graduated cylinder has 22 mL of water placed in it. An irregularly
shaped rock is then placed in the graduated cylinder and the volume of

the rock and water in the graduated cylinder now reads 30 mL . The
mass of the rock is 24 g. What is the density of the rock?

72 g/cm3
5 g/cm3
12 g/cm3
3 g/cm3

22. A rectangular solid of unknown density is 5 cm long, 2 cm high, and
4 cm wide. The mass of this solid is 300 grams. Given this information

for this homogeneous material, calculate the density.

12,000 g/cm3
7.5 g/cm3
57 g/cm3
120 g/cm3

23. Silver has a density of 10.5 g/cm3 and gold has a density of 19.3
g/cm3 . Which would have a greater mass, 5 cm3 of silver or 5 cm3 of

gold?

Gold
Silver
Aluminum

Same mass

24. A 28.5 g of iron is added to a graduated cylinder containing 45.5 mL
of water. The water level rises to the 49.1 mark. Calculate the density.

7.92 g/cm3
15.6 g/cm3
325 g/cm3
100 g/cm3

25. 43.2 m = __________ mm
4.32
0.432

43,200
0.0432

26. 8700 mL = ________ L
870.0
8.7
0.087
87,000

27. 5.9 km = _____________ m
0.059
59
5,900

59,000

28. 756.0 cg = _____________ g

7.56
75,000

756
0.0756

29. 23,000 mm = _____________ m

2.3
23.0
230
2300

30. Metric Unit for Mass

LITERS
METERS
GRAMS
SECONDS

31. Metric Unit for Density of a Solid

g/cm
g/mL
g/cm3
cm/g

32. Metric Unit for Density of a Liquid

mL/g
cm3/g
g/cm3
g/mL

33. Which appliance is used twice as many hours on the weekends as it
is on weekdays?

Lights
TV

Computer
Fridge

34.On average, how many hours is the computer used on a weekday?

1
2
5
8

35. Which 2 objects are the same substance?

1 and 2
2 and 3
1 and 4
1 and 3

36. What would the mass of the gold in B if the volume is 50% of A?

250 g
1000 g
2000 g
500 g

37. Why does the Oceanic Plate sink below the Continental Plate?
Because it’s made of Basalt and is more dense than the Oceanic Plate.
The Oceanic Plate made of Basalt is more dense than the Continental

Plate made of Granite.
The Continental Plate is equal in Density to the Oceanic Plate.

None

38. Why are mountains such as the Himalayas formed? Study the
picture.

Continental and Oceanic Plate have the SAME densities
Continental Plates are MORE dense than Oceanic Plates
Continental plates collide with equal density Continental Plates and

are forced upwards.
None

39. What volume of silver metal will have a mass of exactly 300.0 g. The
density of silver is 10.5 g/cm3.

18.5 cm3
28.6 cm3

38.6 cm3
3150 cm3

40. The density of lead is 11.342 g/cm3. What would be the volume of a
400.0 g sample of this metal?

12.3 cm3
4536.6 cm3

35.3 cm3
89 cm3

41. If two objects have the same volume but one has a greater mass,
the one with greater mass

has a lower density
has a higher density

will float
will sink

​What are Phase Changes?

Phase changes are changes in states that can go from or to a solid,
liquid, or gas from a certain melting or freezing point.

In this unit I learned about the three different types of phase changes,
such as a solid, liquid, and a gas and watched many videos and took
many notes in my notebook

Phase Change of Water

● Melt the ice water and record the temperatures every 30 seconds
until you reach boiling point of water.

● Record the temperatures on the following data table:
​ ​Construct a graph of your results. U​ se Link on Classroom

● Respond to the Critical Thinking Questions

Graph:

Questions:

1. When did the temperatures stay the same on the graph? Why did
the temperatures stay the same at 2 points during the lab?

The first minute and a half to two minutes were the same
temperatures because they were just starting off and just starting to
get warmer to hotter so they stayed the same a few times throughout
the experiment.

2. How would the graph be different if we tried this experiment with
Gold?

If we tried this experiment with gold then it would have been different
because gold has a different melting point than ice.

3. What is the role of energy during the phase changes?
The role of energy during phase change changes from a solid to a liquid.

4. Describe the motion of the molecules throughout the experiment.
Find diagrams that show the motion.

The motion of the molecules throughout the experiment was first a
solid (ice in water). Then as we kept stirring it and making it melt (liquid
water). As it got in the high 50’s to 70 degrees celsius it started to
steam and vaporize a lot (gas).

5. How does the Average Kinetic Energy change throughout the
experiment?

Average Kinetic Energy is the energy of a moving object. If the speed of
the object increases, its kinetic energy increases. If the speed of the

person stirring the ice water slowed down or sped up, it would have an
affect on the object.

7. Why do we put water in a car’s engine?
You put water in a car engine because when cars start to move for a
long period of time, the engine gets hot. When the engine gets hot the
water helps to cool down the engine and prevent it from overheating.

8. Compare this substance to water. Explain:
This substance is different than water because everything has a
different melting point and can’t all be the same. The reverse of the
melting process is called freezing. Liquid water freezes and becomes
solid ice when the molecules lose energy.

Graph:

Phase Changes Quiz:

Calculate Heat Energy:

Equations: Heat of Fusion
Heat = Mass Change in Temperature SH
Heat = Mass Heat of Vaporization
Heat = Mass

Data Table:

Metal Mass Heat Melting Boilin Heat of Specifi Heat
of Pt.​ (C) g Pt. Vaporizati c Heat Energy
Fusio (C) on (cal/gC (cal)
n )
(cal/g) (cal/g)

Water 37 g 80 0 100 540 1 12,317.55
9 cals

Silver 37 g 26 961 2212 2356 0.057 53,280.0
cals