ENGINEERING ACTIVITY
BLAME IT ON THE pH!
NAME:
CLASS:
SUBJECT:
DATE:
TEAM NAME:
AIM OF THE ACTIVITY:
MATERIAL(S) USED:
ENGINEERING PROCESS:
1. INVESTIGATING THE PROBLEM:
2. PLANNING:
3. PROCESS:
a. Making and evaluating the red cabbage indicator:
b. Adjusting and maintaining the pH level in the three planters
c. Tabulating the observations:
Jar/Bottle
Day 1
Day 5
A-acidic
pH valueObservationsShoot:
Day 10
Day 14
pH valueObservationsShoot:
pH valueObservationsShoot:
pH valueObservationsShoot:
Root
Root
Root
pH valueObservationsShoot:
pH valueObservationsShoot:
pH valueObservationsShoot:
pH valueObservationsShoot:
Root:
Root
Root
Root
pH valueObservationsShoot:
pH valueObservationsShoot:
pH valueObservationsShoot:
pH valueObservationsShoot:
Root
Root
Root
Root
Root:
B- neutral
C-basic
4. INFERENCE:
5. SUGGESTIONS:
DIFFICULITIES/CONSTRAINTS FACED DURING THE ACTIVITY AND
HOW WERE THEY OVERCOME:
COMMENTS/ SUGGESTIONS FOR OTHER TEAM’S PRESENTATION:
TEAM NAME
COMMENTS/SUGGESTIONS/QUESTIONS
REVIEW SHEET 1
SCORE:
TEACHERS SIGNATURE:
Acids, Bases, and Salts
1
2
3
4
5
6
7
8
9
12
10
11
13
14
16
17
15
Across
2 A substance that releases hydroxide
ions into water. (4)
5 The strength of an acid. (7)
6 One of the products when you add
an acid to a base. (5)
9 Acid found in your stomach. (12)
12 The process of adding acids to bases.
(14)
14 One of the products of adding an
acid to a base. (4)
16 A solid substance composed of
positive and negative ions. (7)
Down
1 A substance that releases hydrogen
ions into water. (4)
2 How bases usually taste. (6)
3 How acids usually taste. (4)
4 An ion formed when a hydrogen ion
combines with a water molecule. (9)
7 Color of litmus paper in bases. (4)
8 Scale used to measure acidity and
alkalinity. (2)
10 A substance used as an acid-base
indicator. (6)
11 An atom or molecule with a positive
or negative charge. (3)
13 The strength of a base. (10)
15 Common name for sodium
hydroxide. (3)
17 Color of litmus paper in acids. (3)
ANSWERS
A
C
A C I D I
D
B
L
H Y D
U
N E U T R A
L
K
A
L
I
N
I
C R Y S T
E
Y
D
B A S E
H
I
O
T Y
T
U
D
W A T E R
R
P
E
R O C H L O R I C
N
I
O
L I Z A T I O N
U
M
M
U
S A L T
Y
E
A L
REVIEW SHEET 2
SCORE:
TEACHERS SIGNATURE:
Answer the given MCQ’s by ticking the correct option
1. Which one of the following types of medicines is used for treating acidity?
Antacid
Analgesic
Antiseptic
Antibiotic
2. A, B, C, D, samples of liquids have PH values of 14.0, 7, 1, 5 respectively.
Which of these could be that of 1 M NaOH solution?
Sample A
Sample D
Sample C
Sample B
3. Lemon contains
citric acid
Lactic acid
Formic acid
Tartaric acid
4. Name an indicator which indicates the various levels of hydrogen ion
concentration
phenolphthalein
both Litmus paper and PH paper
Litmus paper
PH paper
5. Match the following with correct response.
(1) Metal oxides
(2) Non-metal oxides
(3) Salts
(4) Neutral Basses
(A) Hydroxyl Irons
(B) Acidic
(C) basic
(D) Hydroxyl Ions
1-A, 2-C, 3-B, 4-D
1-B, 2-D, 3-A, 4-C
1-C, 2-B, 3-D, 4-A
1-D, 2-A, 3-C, 4-B
6. Match the following with correct response.
(1) Strongly alkaline
(2) Weakly alkaline
(3) Weakly acidic
(4) Strongly acidic
(A) Yellow
(B) Violet
(C) Red
(D) Blue
1-C, 2-B, 3-D, 4-A
1-A, 2-C, 3-B, 4-D
1-D, 2-A, 3-C, 4-B
1-B, 2-D, 3-A, 4-C
7. Common salt besides being used in kitchen can also be used as raw
material for making?
A. Washing soda
B. Bleaching powder
C. Baking soda
D. Slaked lime
A and C
All of these
A and D
B and D
8. Which of the following statements are correct about an aqueous solution of
an acid and of a base?
A. lower the pH weaker the base
B. Lower the pH stronger the base
C. higher the pH stronger the acid
D. higher the pH weaker the acid
A and D
All of these
A and C
B and C
9. Which of the following properties are shown by dilute hydrochloric acidA. It turns blue lit muss red
B. It turns red litmus blue
C. It reacts with zinc and a gas evolves
D. It reacts with solid sodium carbonate to give brisk effervescence
A, C and D
A, B and D
A and C
A and B
10.
Honey bee sting has-
Butyric acid
None of these
formic acid
acetic acid
11.
Under what soil condition do you think a farmer would spread or treat
the soil of his fields with quick lime (CaO) or slaked
time (CaCO3)(CaCO3) ?
When the PH of the soil increases
When the PH of the soil decreases
When the nutrients of the soil is lost
All of these
12.
The PH of solution A is 6 and PH of solution B is 8. Which solution has
more hydrogen ion concentration?
Name of these
Solution A
Solution B
same conc. in both A and B
ANSWERS
1. Antacid
2. Sample A
3. Citric acid
4. PH Paper
5. 1-C, 2-B, 3-D, 4-A
6. 1-B, 2-D, 3-A, 4-C
7. A & C
8. A & D
9. A, C & D
10.Formic Acid
11.When the ph of the soil decreases
12.Solution A
Answer:
REVIEW SHEET 3
SCORE:
TEACHERS SIGNATURE
Write a short essay on ‘Importance of ph value in my life!’ (100-120 words)
Answer:
Answer:
WORKSHEET
WORKSHEET