How bonding and structure are related to the properties of substances key terms

solid

A state of matter characterized by fixed shape and volume, with closely packed particles that vibrate in place.

liquid

A state of matter that has a definite volume but takes the shape of its container, with particles that are close together but can move past one another.

melting point

In The three states of matter, melting point means the temperature at which a solid turns into a liquid. This matters in How bonding and structure are related to the properties of substances because it supports the learning objective to link melting and freezing to the melting point of a substance. Use melting point only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

freezing

In The three states of matter, freezing means the chemistry idea used to link melting and freezing to the melting point of a substance. Use this term specifically in How bonding and structure are related to the properties of substances when explaining this objective, so it is not confused with a broader bonding, structure, or materials term.

boiling point

In The three states of matter, boiling point means the temperature at which a substance changes from a liquid to a gas. This matters in How bonding and structure are related to the properties of substances because it supports the learning objective to link boiling and condensing to the boiling point of a substance. Use boiling point only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

condensing

In The three states of matter, condensing means the process of a gas changing into a liquid, typically when cooled. This matters in How bonding and structure are related to the properties of substances because it supports the learning objective to link boiling and condensing to the boiling point of a substance. Use condensing only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

particle model

A representation of the arrangement and behavior of particles in solids, liquids, and gases.

states of matter

The distinct forms that different phases of matter take on, specifically solid, liquid, and gas.

melting

The process where a solid turns into a liquid as particles gain energy and overcome intermolecular forces.

boiling

The process where a liquid turns into a gas as particles gain enough energy to overcome intermolecular forces throughout the liquid.

change of state

The transition between solid, liquid, and gas phases of a substance, influenced by energy and particle forces.

forces between particles

The interactions that determine the physical properties of a substance, affecting its state and energy requirements for changes.

particles

In The three states of matter, particles means the small constituents that make up all matter, including atoms and molecules. This matters in How bonding and structure are related to the properties of substances because it supports the learning objective to link the type of particles present to the bonding and structure of the substance. Use particles only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

bonding

The interaction between atoms that holds them together in a substance, influencing its structure and properties.

melting point

In The three states of matter, melting point means the temperature at which a solid turns into a liquid. This matters in How bonding and structure are related to the properties of substances because it supports the learning objective to explain why stronger forces between particles usually lead to higher melting points and boiling points. Use melting point only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

boiling point

In The three states of matter, boiling point means the chemistry idea used to explain why stronger forces between particles usually lead to higher melting points and boiling points. Use this term specifically in How bonding and structure are related to the properties of substances when explaining this objective, so it is not confused with a broader bonding, structure, or materials term.

melting point

In The three states of matter, melting point means the temperature at which a solid turns into a liquid. This matters in How bonding and structure are related to the properties of substances because it supports the learning objective to predict the state of a substance at a given temperature using melting point and boiling point data. Use melting point only in this subtopic-relevant sense so the definition stays concise, curriculum-specific, and useful for AQA GCSE Biology revision. Students should use this term accurately when they explain the biology, identify symptoms, or justify an answer in GCSE Biology questions.

boiling point

In The three states of matter, boiling point means the chemistry idea used to predict the state of a substance at a given temperature using melting point and boiling point data. Use this term specifically in How bonding and structure are related to the properties of substances when explaining this objective, so it is not confused with a broader bonding, structure, or materials term.

bulk properties

Observable characteristics of a material that arise from the collective behavior of its atoms.

atoms

The basic units of matter that make up all substances, which do not exhibit the bulk properties of the material.

simple particle model

A model that represents particles as solid inelastic spheres with no forces between them.

limitations of the particle model

The shortcomings of the simple particle model in accurately describing the behavior and interactions of particles.

state symbol

A notation used to indicate the physical state of a substance in a chemical equation, such as (s) for solid, (l) for liquid, (g) for gas, and (aq) for aqueous.

aqueous

A state symbol (aq) indicating that a substance is dissolved in water, forming an aqueous solution.

state symbol

A notation used to indicate the physical state of a substance in a chemical equation, such as (s), (l), (g), or (aq).

chemical equation

A representation of a chemical reaction using symbols and formulas to show the reactants and products.

state symbol

A notation used to indicate the physical state of a substance in a chemical equation, such as (s) for solid, (l) for liquid, (g) for gas, and (aq) for aqueous.

aqueous solution

A solution in which water is the solvent, often represented by the state symbol (aq) in chemical equations.

ionic compound

A substance formed from the electrostatic attraction between oppositely charged ions, arranged in a regular giant ionic lattice.

giant ionic lattice

A three-dimensional structure of ions held together by strong electrostatic forces in ionic compounds.