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Course: Alhussan Chemistry — Stage 7
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Alhussan Chemistry — Stage 7

Chapter 1: The Particle Model and States of Matter

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Chapter 2: Elements, Compounds and Mixtures

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Chapter 3: Metals and Non-Metals

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Chapter 4: Chemical Reactions 1

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Chapter 5: Acids and Alkalis

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Chapter 6: The Earth and Plate Tectonics

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Quiz

Chemistry 5.2 The pH scale — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
True or false? Indicator is more precise than a pH meter.
True
False
2.
Strong alkalis have a pH of ____.
12 to 14
3 to 6
8 to 11
0 to 2
3.
pH of acid as it is diluted. At what value of "Volume of water added (cm³)" is "pH" smallest?
Dr Dabour Hub Academy - figure 1
0
1000
100
10
4.
Pure water has a pH of ____.
7
14
1
0
5.
True or false? Diluting an acid lowers its pH.
True
False
6.
Litmus only shows if a solution is acidic or ____.
weak
alkaline
strong
neutral exactly
7.
A pH meter read 9.7; indicator suggested 9. What is the difference?
0.7
18.7
9.0
1.1
8.
A pH meter read 4.6; indicator suggested 4. What is the difference?
1.1
8.6
4.0
0.6
9.
pH of household substances. Which has the smallest value?
Dr Dabour Hub Academy - figure 2
Lemon juice
Vinegar
Water
Baking soda
10.
Each tenfold dilution raises pH by 1. An acid of pH 1 is diluted 2 times tenfold. New pH?
3
−1
1
2
11.
True or false? pH 7 is acidic.
True
False
12.
Which term matches this definition? “Data collected by someone else, such as values from the Internet.”
Variable
Primary data
Secondary data
Anomaly
13.
pH of rain at a weather station. What is the value of "pH" when "Month" is Apr?
Dr Dabour Hub Academy - figure 3
5.0
5.2
5.4
5.6
14.
True or false? Universal indicator is purple in strong acid.
True
False
15.
Which statement is NOT correct?
Universal indicator is green at pH 7.
Indicator is more precise than a pH meter.
Pure water has a pH of 7.
Adding water to an acid makes the pH rise towards 7.
16.
Which statement is correct?
Strong acids have pH 8–11.
Diluting an acid lowers its pH.
Universal indicator is purple in strong acid.
Pure water has a pH of 7.
17.
Which statement is NOT correct?
Blood has a pH of about 7.4.
An acid has a pH less than 7.
The higher the pH the more alkaline the solution.
Diluting an acid lowers its pH.
18.
Which is the correct definition of “Strong alkali”?
Graduated tube for adding precise volumes.
Solution with pH below 7 containing hydrogen ions.
Alkali with pH 12–14.
Data collected by someone else.
19.
Each tenfold dilution raises pH by 1. An acid of pH 2 is diluted 3 times tenfold. New pH?
6
5
2
−1
20.
pH 3 is how many times more acidic than pH 6? (each unit = ×10)
10,000 times
30 times
1000 times
3 times
21.
Which statement is correct?
Strong acids have pH 8–11.
Litmus gives the exact pH.
Pure water has a pH of 0.
The higher the pH the more alkaline the solution.
22.
Which term matches this definition? “Soluble base with pH above 7 containing hydroxide ions.”
Base
Alkali
Sodium chloride
Sulfuric acid
23.
Which term matches this definition? “Scale from 0 to 14 measuring acidity.”
Magnesium hydroxide
Titre
pH scale
Calcium carbonate
24.
pH of body fluids. About how many times bigger is Pancreatic juice than Stomach acid?
Dr Dabour Hub Academy - figure 4
6.1
8.2
4.1
2.0
25.
pH of household substances. What is the total of all the values?
Dr Dabour Hub Academy - figure 5
49
13
44
39
26.
pH 2 is how many times more acidic than pH 6? (each unit = ×10)
40 times
100,000 times
4 times
10,000 times
27.
Which statement is correct?
pH 7 is acidic.
Rain water is slightly acidic.
Pure water has a pH of 0.
Strong acids have pH 8–11.
28.
pH of household substances. About how many times bigger is Oven cleaner than Lemon juice?
Dr Dabour Hub Academy - figure 6
9.8
3.2
13.0
6.5
29.
pH of acid as it is diluted. Calculate the percentage change in "pH" from 0 to 1000.
Dr Dabour Hub Academy - figure 7
75%
400%
−300%
300%
30.
pH 2 is how many times more acidic than pH 7? (each unit = ×10)
1,000,000 times
50 times
100,000 times
5 times
31.
Weak acids have a pH of ____.
3 to 6
0 to 2
12 to 14
8 to 11
32.
Universal indicator is ____ at pH 5 to 6.
blue
green
purple
yellow
33.
Each tenfold dilution raises pH by 1. An acid of pH 3 is diluted 1 times tenfold. New pH?
2
4
40
3
34.
pH of body fluids. Which has the smallest value?
Dr Dabour Hub Academy - figure 8
Stomach acid
Blood
Urine
Saliva
35.
A pH meter read 6.86 for a buffer whose true pH is 7.0. What is the percentage error?
2.0%
0.1%
20.0%
98.0%
36.
Which term matches this definition? “pH exactly 7.”
Squeaky pop test
Neutral
Litmus
Corrosive
37.
Each tenfold dilution raises pH by 1. An acid of pH 1 is diluted 1 times tenfold. New pH?
20
1
2
4
38.
Each tenfold dilution raises pH by 1. An acid of pH 1 is diluted 3 times tenfold. New pH?
3
1
−2
4
39.
Which term matches this definition? “Electronic device giving a precise pH.”
pH meter
pH scale
Antacid
Calcium carbonate
40.
Which statement is correct?
Strong acids have pH 8–11.
An alkali has a pH more than 7.
Diluting an acid lowers its pH.
Litmus gives the exact pH.
41.
Which statement is correct?
Universal indicator is green at pH 7.
Pure water has a pH of 0.
Litmus gives the exact pH.
pH 12 is acidic.
42.
True or false? Blood has a pH of 2.
True
False
43.
Which term matches this definition? “Acid with pH 0–2.”
Strong acid
Hydrogen
Vitamin C
Carbonic acid
44.
True or false? Adding water to an acid makes the pH rise towards 7.
True
False
45.
True or false? Weak acids have a pH of 3 to 6.
True
False
46.
Which is the correct definition of “Weak acid”?
Alkali with pH 12–14.
Acid with pH 3–6.
Weak acid formed when CO2 dissolves in rain.
Sodium hydrogencarbonate.
47.
Which statement is correct?
Pure water has a pH of 0.
pH 12 is acidic.
Litmus gives the exact pH.
An acid has a pH less than 7.
48.
True or false? Universal indicator is purple in strong alkali.
True
False
49.
pH of rain at a weather station. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 9
A
B
C
D
50.
pH of body fluids. Which has the greatest value?
Dr Dabour Hub Academy - figure 10
Stomach acid
Saliva
Pancreatic juice
Urine
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Part of Chapter 5: Acids and Alkalis — see every lesson and quiz in this unit.
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