Experiment answer sheet THE FINAL

Experiment Competition

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

Time : 3 hr 30 min
Points : 40
Page 1

ANSWER SHEET

Country
Student 1

Student 2

Student 3

Name
Code

Signature

Experiment I. Determination of the Densities of Fruit Juices
Questions
(Points)

Data and Answers
d0

I-1-1
(1.25)

d1

d2

d3

d4

Masses (g)
Lengths of spring (cm)

I-1
(6.0)
I-1-2
(2.5)

I-1-3
(1.25)

Slope

Student 1

cm/g

Student 2

Intercept

cm

Student 3

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

ANSWER SHEET

Experiment Competition

Time : 3 hr 30 min
Points : 40
Page 2

Name
Code

Experiment I. Determination of the Densities of Fruit Juices (Cont’d)
(Show your working)

I-1
(6.0)

I-1-4
(1.0)

Spring Constant
Immersed weights

I-2
(6.0)

I-2-1
(2.0)

Code

50g + 50g

50g + 50g + 50g

Student 2

Student 3

Volume of water
without weights in it
(cm3)
Volume read from scale
after immersing weights
(cm3)
Volume difference (cm3)
(= Volume of liquid
displaced)

Student 1
Name

N/m

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

Experiment Competition

Time : 3 hr 30 min
Points : 40
Page 3

ANSWER SHEET

Experiment I. Determination of the Densities of Fruit Juices (Cont’d)
Questions
(Points)

Data and Answers

Juice

Apple

Mandarin

Lengths of spring with
the weights outside
juice (cm)

I-2-2
(2.0)

Immersed weights

50g + 50g

50g + 50g +
50g

50g + 50g

50g + 50g + 50g

Length of spring with
the weights after
immersing (cm)

I-2
(6.0)

Length difference (cm)

I-2-3
(2.0)

I-3
(2.0)

Buoyant force (N)

Density (g/cm3)

Average density
(g/cm3)

------------------------------------ DO NOT WRITE BELOW -----------------------------------Total points for experiment I

Experiment Competition

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

Time : 3 hr 30 min
Points : 40
Page 4

ANSWER SHEET

Student 1

Student 2

Student 3

Name
Code

Experiment II. Determination of the Citric Acid Contents in Fruit Juices
Questions
(Points)

Data and Answers
Show your calculation of the average titer (for both juices)

II-1
(7.0)

Juices

Mandarin
Trials

1

2

3

Apple
4

5

6

7

Initial Readings
(in
)
Final Readings
(in
)
Volumes of
NaOH solution
consumed for
titration

Average volume

Student 1
Name

Average volume

Student 2

Student 3

8

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

Experiment Competition

Time : 3 hr 30 min
Points : 40
Page 5

ANSWER SHEET

Code

Experiment II. Determination of the Citric Acid Contents in Fruit Juices
(Cont’d)
Questions
(Points)

Data and Answers
(Show your working)

II-2
(2.0)

Moles of NaOH

Student 1
Name

Mandarin

Apple

Student 2

Student 3

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

Experiment Competition

Time : 3 hr 30 min
Points : 40
Page 6

ANSWER SHEET

Code

Experiment II. Determination of the Citric Acid Contents in Fruit Juices
(Cont’d)
Questions
(Points)

Data and Answers
(Show your working)

II-3
(2.0)

Moles of citric
acid

Mandarin

Apple

Masses of citric
acid

Mandarin

Apple

Student 1
Name
Code

Student 2

Student 3

Experiment Competition

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

Time : 3 hr 30 min
Points : 40
Page 7

ANSWER SHEET

Experiment II. Determination of the Citric Acid Contents in Fruit Juices
(Cont’d)
Questions
(Points)

Data and Answers
(Show your working)

II-4
(2.0)

Percent
concentration of
citric acid

Mandarin

%

Apple

%

------------------------------------ DO NOT WRITE BELOW -----------------------------------Total points for experiment II

Student 1
Name
Code

Student 2

Student 3

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

ANSWER SHEET

Experiment Competition

Time : 3 hr 30 min
Points : 40
Page 8

Experiment III. Anatomy and classification of fruits and seeds
Question
(Points)

III-1
(1.0)

III-2
(2.5)

Data and Answers

Location of the
structure(s)
originated from
A

Location of the
tissues
originated from
A, B, C and D

Student 1

Student 2

Student 3

Name
Code

Experiment III. Anatomy and classification of fruits and seeds (Cont’d)
Question

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

ANSWER SHEET
(Points)

Data and Answers

III-3-1
(2.0)

fruits

1
2
Fruits for ① and ②

III-3-2
(2.0)
Classification schemes for ‘c’ and ‘d’
characters

c
d

III-3-3
(4.0)

Experiment Competition

Time : 3 hr 30 min
Points : 40
Page 9

Fruit
Classific
ation

A

B

C

D

E

Acorn

Apple

Bean pod

Lychee

Lemon

F
Persimmon

Single seed fruit

12th International Junior Science Olympiad
Many seeded
fruit Republic of Korea
Daegu,
December 8, 2015

ANSWER SHEET

Aggregate fruit
Multiple fruit

G
Rice

H
Strawberry

Experiment Competition

Time : 3 hr 30 min
Points : 40
Page 10

True fruit
Accessory fruit
Fleshy fruit
Dry fruit

Student 1
Student 2
Student 3
Name

Code

III-3-4
(1.5)

③

Number
④

Alphabet in Box 1

12th International Junior Science Olympiad
Daegu, Republic of Korea
December 8, 2015

ANSWER SHEET

Experiment Competition

Time : 3 hr 30 min
Points : 40
Page 11

⑤

⑥
------------------------------------ DO NOT WRITE BELOW -----------------------------------Total points for experiment III