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WorksheetsChemistry Lec/Lab (S.U)
Total questions: 85
Worksheet time: 56mins
Early Times
Sour and corrosive
Acids
Bases
Early Times
Bitter and usually slippery
Acids
Bases
Arrhenius Definition
Releases hydrogen ions (H+)
Acids
Bases
Arrhenius Definition
Receives hydroxyl ions (OH-)
Acids
Bases
Bronsted and Lowry Definition
Substances that donate protons
Acids
Bases
Bronsted and Lowry Definition
Substances that accept protons
Acids
Bases
Acids - Sour and corrosive
Bases - Bitter and usually slippery
Early Times
Arrhenius Definition
Bronsted and Lowry Definition
Acids - Releases hydrogen ions (H+)
Bases - Receives hydroxyl ions (OH-)
Early Times
Arrhenius Definition
Bronsted and Lowry Definition
Acids - Substances that donate protons
Bases - Substances that accept protons
Early Times
Arrhenius Definition
Bronsted and Lowry Definition
The (a) or basic property of a substance is most conveniently expressed as pH.
A measure of the amount of H+ ions in a solution.
(a)
Water with balanced H+ and OH- = (a) (pH 7)
Acids pH level
pH 7 below
pH 7 above
Bases pH level
pH 7 below
pH 7 above
Used to accurately measure pH.
(a)
pH meter is used to accurately measure pH; acid-base indications may also be used.
True
False
Acid-Base Indicators
_____ ____ obtained from vegetables and lichens.
(a)
It displays various colors as pH changes with the addition of acids or bases.
(a)
It helps provide a suitable medium for pH-sensitive reactions.
(a)
Buffers
Made up of a ____ ____ + (plus) one of its salts or weak base mixed with one of its salts.
(a)
Buffers
Made up of a weak acid + (plus) one of its salts or ____ ____ mixed with one of its salts.
(a)
A solution that resists changes in pH when small quantities of acid or bases are added to it.
(a)
A solution that resists changes in pH when small quantities of acid or bases are added to it.
(a)
In solution
A buffer has its component molecules and ions (including H+ or OH-) in (a) with each other.
Addition of acid or base reacts with and depletes one of the components of the buffer causing the equilibrium to shift to replenish the depleted component.
(a)
Organic compounds consisting of carbon (C) and hydrogen (H+) atoms.
(a)
Formed between carbon atoms; it can be single, double, or triple.
Ionic bond
Covalent bond
Metallic bond
- Open chain or cyclic
Example:
Alkane → C-C
Alkene → C=C
Alkyne → C≡C
- Can be differentiated by the presence of the benzene ring
Aliphatic Hydrocarbons
Aromatic Hydrocarbons
- Combines benzene ring
Aliphatic Hydrocarbons
Aromatic Hydrocarbons
CnH2n+2
Alkanes
Alkenes
Alkynes
CnH2n
Alkanes
Alkenes
Alkynes
CnH2n-2
Alkanes
Alkenes
Alkynes
Saturated hydrocarbons, which can be either an open chain or cyclic.
Alkanes (CnH2n+2)
Alkenes (CnH2n)
Alkynes (CnH2n-2)
Unsaturated hydrocarbons with one or more carbon-to-carbon double bonds, whether the carbon molecules are open chains or rings.
Alkanes (CnH2n+2)
Alkenes (CnH2n)
Alkynes (CnH2n-2)
Hydrocarbons with one or more carbon-to-carbon triple bonds the carbon skeleton.
Alkanes (CnH2n+2)
Alkenes (CnH2n)
Alkynes (CnH2n-2)
pH of Acids and Bases
Samples: Boiled distilled water
pH level: ???
6
7
3
7
pH of Acids and Bases
Samples: Tap water
pH level: ???
6
7
3
7
pH of Acids and Bases
Samples: Vinegar
pH level: ???
6
7
3
7
pH of Acids and Bases
Samples: Milk
pH level: ???
6
7
3
7
pH of Acids and Bases
Samples: Wine
pH level: ???
3
3
6
8
pH of Acids and Bases
Samples: Colorless soft drinks
pH level: ???
3
3
6
8
pH of Acids and Bases
Samples: Urine
pH level: ???
3
3
6
8
pH of Acids and Bases
Samples: Liquid soap
pH level: ???
3
3
6
8
pH of Acids and Bases
Samples: Saturated solutions of baking soda
pH level: ???
9
6
7
pH of Acids and Bases
Samples: Saturated solution of aspirin
pH level: ???
9
6
7
pH of Acids and Bases
Samples: Saturated solution of antacid
pH level: ???
9
6
7
Acid-Base Indicators
Determined the changes in color at 3 drops of crystal violet and methyl red when 0.05N of HCI and NaOH with different number of drops were added (or change.
Crystal Violet: How many drops of distilled water?
2 drops
3 drops
5 drops
4 drops
Acid-Base Indicators
Determined the changes in color at 3 drops of crystal violet and methyl red when 0.05N of HCI and NaOH with different number of drops were added (or change.
Methyl red: How many drops of distilled water?
10 drops
6 drops
5 drops
8 drops
Crystal Violet (Dark Violet)
1 drop of 0.05N of ____ = Green
3 drops = Yellow green
6 drops = Yellow
0.05N of HCI
0.05N of NaOH
Crystal Violet (Dark Violet)
1 drop of 0.05N of ____ = Lavender/Gray
3 drops = White purple
6 drops = Gray
0.05N of HCI
0.05N of NaOH
Methyl Orange (Orange)
1 drop of 0.05N of ____ = Maroon
3 drops = Magenta
6 drops = red
0.05N of HCI
0.05N of NaOH
Methyl Orange (Orange)
1 drop of 0.05N of ____ = Orange
3 drops = Yellow
6 drops = Light orange
0.05N of HCI
0.05N of NaOH
Behaviors of Salts in Aqueous Solutions
Sodium chloride
pH 7
pH 5
pH 11
pH 3
Behaviors of Salts in Aqueous Solutions
Sodium acetate
pH 7
pH 5
pH 11
pH 3
Behaviors of Salts in Aqueous Solutions
Sodium sulfate
pH 7
pH 5
pH 11
pH 3
Behaviors of Salts in Aqueous Solutions
Ammonium chloride
pH 7
pH 5
pH 11
pH 3
Behaviors of Salts in Aqueous Solutions
Sodium carbonate
pH 7
pH 5
pH 11
pH 3
Behaviors of Salts in Aqueous Solutions
Saturated solution of baking soda
pH 7
pH 5
pH 11
pH 3
Buffers
2mL 0.1M of Acetic acid + 2mL 0.1M Sodium acetate
Initial pH: pH 5 / After adding HCI: pH 4 / After adding NaOH: pH 4
Initial pH: pH 7 / After adding HCI: pH 2 / After adding NaOH: pH 7
Initial pH: pH 6 / After adding HCI: pH 1 / After adding NaOH: pH 7
Initial pH: pH 6 / After adding HCI: pH 1 / After adding NaOH: pH 6
Buffers
2mL 0.1M of Ammonium hydroxide + 2mL 0.1M of Ammonium chloride
Initial pH: pH 5 / After adding HCI: pH 4 / After adding NaOH: pH 4
Initial pH: pH 7 / After adding HCI: pH 2 / After adding NaOH: pH 7
Initial pH: pH 6 / After adding HCI: pH 1 / After adding NaOH: pH 7
Initial pH: pH 6 / After adding HCI: pH 1 / After adding NaOH: pH 6
Buffers
2mL of distilled water + 2mL 0.1M of Sodium chloride
Initial pH: pH 5 / After adding HCI: pH 4 / After adding NaOH: pH 4
Initial pH: pH 7 / After adding HCI: pH 2 / After adding NaOH: pH 7
Initial pH: pH 6 / After adding HCI: pH 1 / After adding NaOH: pH 7
Initial pH: pH 6 / After adding HCI: pH 1 / After adding NaOH: pH 6
Buffers
4mL of Distilled water
Initial pH: pH 5 / After adding HCI: pH 4 / After adding NaOH: pH 4
Initial pH: pH 7 / After adding HCI: pH 2 / After adding NaOH: pH 7
Initial pH: pH 6 / After adding HCI: pH 1 / After adding NaOH: pH 7
Initial pH: pH 6 / After adding HCI: pH 1 / After adding NaOH: pH 6
Hydrocarbons
__________ compounds consisting of carbon (C) and hydrogen (H+) atoms.
Organic
Inorganic
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Preparation of _________ synthesized _________ gas (ethylene) from calcium carbide and water.
(a)
Preparation of Acetylene
Synthesized acetylene gas (ethylene) from calcium carbide and water; used a _-way stopcock.
3-way
5-way
2-way
6-way
Bromine Test
(a) samples were mixed with bromine water; colors and ranks were observed.
Bromine Test
Hexane
Colorless or clear / 1 minute & 12 seconds / No Rank (no reaction or no color change)
Colorless / 5 seconds / Rank 1
Cloudy / 1 minute & 8 seconds / Rank 2
Bromine Test
Acetylene
Colorless or clear / 1 minute & 12 seconds / No Rank (no reaction or no color change)
Colorless / 5 seconds / Rank 1
Cloudy / 1 minute & 8 seconds / Rank 2
Bromine Test
Toluene
Colorless or clear / 1 minute & 12 seconds / No Rank (no reaction or no color change)
Colorless / 5 seconds / Rank 1
Cloudy / 1 minute & 8 seconds / Rank 2
H2SO4
(a)
HNO3
(a)
(a) mixture (sulfuric acid mixed with nitric acid) was added to a test tube containing toluene (diluted with 20 drops of distilled water).
The nitrating mixture produced (a) (reaction of sulfuric acid mixture with nitric acid).
When nitrating mixture was added to the diluted toluene, a ______ ____ _____ was produced.
(a)
Nitrating mixture (sulfuric acid mixed with nitric acid) was added to a test tube containing tuolene (diluted with __ drops of distilled water).
20 drops
13 drops
19 drops
11 drops
7 drops
Bromine Test
Rank no. 1
Acetylene
Hexane
Toluene
Bromine Test
Rank no. 2
Acetylene
Hexane
Toluene
Bromine Test
No rank (no reaction/no color change)
Acetylene
Hexane
Toluene
Bromine Test
Colorless/Clear
Hexane
Acetylene
Toluene
Bromine Test
Colorless
Hexane
Acetylene
Toluene
Bromine Test
Cloudy
Hexane
Acetylene
Toluene
Bromine Test
1 minute & 12 seconds time
Hexane
Acetylene
Toluene
Bromine Test
5 seconds time
Hexane
Acetylene
Toluene
Bromine Test
1 minute & 8 seconds time
Hexane
Acetylene
Toluene
