Laboratory Techniques and Experiments in Chemistry
Turn on/off:
encendre, switch on/off:
encendre, place:
posar, pour:
abocar, fill:
omplir, insert:
introduir, remove:
treure, withdraw:
sacar, connect:
connectar, attach:
adjuntar, fix:
reparar,measure:
mesurar, calculate:
calcular, find:
trobar, draw:
dibuixar, sketch:
esborrany, observe:
observar, arrange:
organitzar, note:
anotar,repeat:
repetir, weigh:
pesar,allow:
permetre, compare:
comparar, consider:
considerar, dry:
assecar, moisten:
humitejar, add:
afegir, cover:
tapar:
Heat:
escalfar, cool:
refredar, dilute:
diluir,
Basic Science Experiments
Experiment 1: Electrolysis
Materials:
- Container
- Dilute sulfuric acid
- Two electrodes (e.g., copper and zinc, carbon and iron)
- Galvanometer
- Wires
Procedure:
- Fill the container with dilute sulfuric acid.
- Arrange two electrodes in the electrolyte so that they are vertical and at a distance from each other.
- Connect a galvanometer across the plates by means of two wires.
- Note the reading indicated by the galvanometer deflection.
- Wait for a short time.
- Observe the action of the acid and the electrodes.
- Remove the electrodes
Grade 10 Science Notes: Chemistry, Biology, Ecology, and Optics
Grade 10 Chemistry
1. Atomic Structure
Atoms and Elements
- Atoms: Smallest unit of matter, consists of protons, neutrons, and electrons.
- Protons: Positively charged, found in the nucleus.
- Neutrons: Neutral, found in the nucleus.
- Electrons: Negatively charged, orbit the nucleus.
- Atomic Number (Z): Number of protons in an atom.
- Mass Number (A): Total number of protons and neutrons.
- Isotopes: Atoms of the same element with different numbers of neutrons.
Electron Configuration
- Electron Shells: Energy levels where
Drug Delivery Systems: A Comprehensive Guide to Pharmaceutical Formulations
Colloids and Gels
Disperse Systems
- Molecular (<1mm): Oxygen molecules, ions, glucose
- Colloidal (1nm-500nm): Polymers, cheese, butter
- Coarse (>500nm): Sand in water, red blood cells
DLVO Theory
- Attractive Forces: Result from van der Waals forces, which are caused by dipole-dipole interactions.
- Electrostatic Repulsion: Results from electrical double layers on each particle.
Colloidal Drug Delivery Systems
- Micelles: Solubilize poorly water-soluble compounds.
- Microemulsions: Deliver oil-soluble drugs via
Understanding Water Hardness and Treatment Methods
What is Water Hardness?
Hardness of water is a property that prevents the lathering of soap. This is due to the presence of certain salts of calcium, magnesium, and other heavy metals dissolved in the water.
When hard water is treated with soap (sodium or potassium salt of higher fatty acids like oleic, palmitic, or stearic acid), it doesn’t produce lather but forms a white precipitate. This precipitate is formed due to the formation of insoluble soaps of calcium and magnesium.
Types of Hardness
There
Read MoreUnderstanding Corrosion: Types, Causes, and Prevention
Understanding Corrosion
Corrosion is a more complex process than simple oxidation. It’s a galvanic process occurring between a metal and its environment, leading to deterioration. This deterioration manifests as:
- Ruptured exhaust pipes and mufflers in cars
- Failing domestic water heaters
- Gas leaks and explosions in storage tanks or pipelines
- Breaks in water pipes
- The collapse of bridges and other structures
The Electrochemical Process of Corrosion
Corrosion involves a metal interacting with its surroundings,
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