1.2: Understand the Interconversions between the Three States of Matter in Terms of: The Names of the Interconversions, How they are Achieved, the Changes in Arrangement, Movement and Energy of the Particles

INTERCONVERSIONS BETWEEN STATES OF MATTER:

Diagram showing the interconversions between the states of matter

EXPLANATION:

CHANGE	EXPLANATION
SOLID → LIQUID MELTING	Heat the Solid until it Melts Particles gain kinetic energy and vibrates faster, allowing particles to overcome forces of attraction that hold them together in the solid Regular pattern is broken down and particles can now slide past one another
LIQUID → SOLID FREEZING	Cool the Liquid until it Freezes Particles lose kinetic energy, allowing forces of attraction between the particles to hold them together Particles arrange themselves into a regular pattern and are no longer able to slide past one another
LIQUID → GAS EVAPORATING	Heat the Liquid until it Boils Particles gain kinetic energy and move further apart, causing the forces of attraction between them to be completely broken and escape from liquid
GAS → LIQUID CONDENSING	Cool the Gas until it Condenses Particles lose kinetic energy and vibrates faster, allowing forces of attraction to bring particles closer together Particles eventually clump together to form a liquid
SOLID → GAS SUBLIMATION	Heat the Solid until it Sublimes Particles gain kinetic energy and vibrates faster, causing forces of attraction between particles to be completely broken and escape from solid

1.1: Understand the Three States of Matter in Terms of Arrangement, Movement and Energy of the Particles

THREE STATES OF MATTERS:

s

	SOLID	LIQUID	GAS
DIAGRAM
ARRANGEMENT	Close together in regular arrangement	Close together in free arrangement	Far apart in random arrangement
MOVEMENT	Vibrate on the spot	Moves around each other	Moves quickly in all directions
ENERGY	Small amount of kinetic energy	Moderate amount of kinetic energy	Large amount of kinetic energy

1.3: Understand How the Results of Experiments Involving the Dilution of Coloured Solutions and Diffusion of Gases can be Explained

DILUTION OF COLOURED SOLUTIONS

Diagram Showing a Crystal of Potassium Manganate (VII) Dissolving in Water

METHOD: Fill beaker with water Add a Crystal of Potassium Manganate (VII) and record observations

RESULTS: When Potassium Manganate (VII) Crystals are Dissolved in Water, a Purple Solution Forms This occurs as both Water and Potassium Manganate (VII) Particles are moving Freely and sliding over each other, allowing them to mix to form a solution with a weaker colour than the original Crystal (original dye) As Potassium Manganate (VII) particles are less concentrated, the final colour will be weaker

DIFFUSION OF GASES

Diagram showing the Diffusion of Bromine Gas with Air

METHOD: Place a jar of air on top of a jar of Bromine Allow time for diffusion to take place and record observations

RESULTS: Overtime, Bromine Gas will diffuse upwards into the jar of air This occurs as large gaps between Air and Bromine particles allows them to move randomly and collide with each other, mixing together to form a gas with lighter shade of brown As Bromine particles are less concentrated, the final colour will be weaker

1.4: Know What is Meant by the Terms: Solvent, Solute, Solution, Saturated Solution

DEFINITION:

s

TERM	DEFINITION
SOLVENT	Substance that dissolves a solute E.g, In salt and water solution, water is the solvent
SOLUTE	Substance that dissolves in a solvent E.g, In salt and water solution, salt is the solute
SOLUTION	Mixture formed by a solvent and solute
SATURATED SOLUTION	Solution where no more solute can dissolve (any more solute that is added will settle to the bottom)

1.6C: Understand How to Plot and Interpret Solubility Curves

SOLUBILITY: How much of a substance will dissolve in a given volume of a solvent (shown in the units of g per 100g of solvent)

s

• If a substance is soluble, it will dissolve in a given amount of solvent (liquid)
• Solubility increases as temperature and pressure increases

EXAMPLE OF INTERPRETING SOLUBILITY CURVES:

SOLID	EXPLANATION
A	As temperature increases, solubility of Solid A increases the most
B	As temperature increases, solubility of Solid B increases but at a slower rate than Solid A
C	Temperature does not affect the solubility of Solid C

1.5C: Know What is Meant by the Term Solubility in the Units g Per 100g of Solvent

SOLUBILITY: How much of a substance will dissolve in a given volume of a solvent (shown in the units of g per 100g of solvent)

s

• If a substance is soluble, it will dissolve in a given amount of solvent (liquid)
• Solubility increases as temperature and pressure increases

EXAMPLES OF SOLUBILITY OF SUBSTANCES IN WATER AT 20°C:

s

SOLUTE	SOLUBILITY
SODIUM CHLORIDE	36
COPPER (II) SULPHATE	32
LEAD (II) IODIDE	0.07
LEAD (II) NITRATE	54

1.8: Understand How to Classify a Substance as an Element, Compound or Mixture

CLASSIFICATIONS:

s

CLASS	DEFINITION
ELEMENT	Substance made up of Atoms that all contain the same number of Protons (one type of Atom) and cannot be split into anything simpler Example: Hydrogen, Oxygen, Carbon
COMPOUND	Substance made up of two or more Elements chemically combined together Example: Copper (II) Sulphate, Calcium Carbonate
MIXTURE	Combination of two or more substances (Elements and / or Compounds) that are not chemically joined together Example: Sand and Water, Oil and Water

Example:

s