Basic Academic IELTS Words for "Chemistry"

Here, you will learn some English words related to Chemistry that are necessary for the Basic Academic IELTS exam.

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atom [noun]

(science) the smallest part of a chemical element that is found in the nature

Ex: The concept of the atom as the fundamental building block of matter dates back to ancient Greek philosophy .

molecule [noun]

the smallest structure of a substance consisting of a group of atoms

Ex: Some molecules are simple , like oxygen , which is made of two oxygen atoms .

element [noun]

a substance that is composed of only one type of atom, typically characterized by specific physical and chemical properties

Ex:

ion [noun]

a particle with a net electric charge due to loss or gain of one or more electrons

Ex: Calcium ions ( Ca²⁺ ) are essential for muscle contraction .

reaction [noun]

(chemistry) a process in which several chemicals combine and form different substances

Ex: Photosynthesis is a key reaction converting CO₂ and water into glucose .

mixture [noun]

(chemistry) a combination of two or more substances without forming a chemical bond or any chemical reaction

Ex: Trail mix is a heterogeneous mixture of nuts , raisins , and chocolate .

acid [noun]

a water-soluble chemical substance that contains Hydrogen and has a sour taste or corrosive feature with a PH less than 7

Ex: Vinegar is an example of a weak acid known as acetic acid , which is commonly used in cooking and cleaning .

base [noun]

(chemistry) a substance that can accept protons, donate electrons, or release hydroxide ions in aqueous solution

Ex:

gas [noun]

the state of a substance that is neither solid nor liquid

Ex: The gas emitted by certain chemicals can be harmful to the environment if not properly controlled .

liquid [noun]

a substance such as water that flows freely, unlike a gas or a solid

Ex: She was careful not to spill the bright blue liquid as she transferred it from one container to another .

solid [noun]

a substance that is firm and has a certain shape, not like gas or liquid

Ex:

to transition [verb]

to make something change from a particular state, condition or position to another

Ex: Scientists transitioned the experiment from theory to practical testing .

pH [noun]

a quantitive mesasure used for determining how acidic or alkanic something is on a scale of 0 to 14

Ex: Soil with a pH below 5.5 may need lime to reduce acidity .

Vocabulary for IELTS Academic (Band 5)
Size and Scale	Dimensions	Weight and Steadiness	Increase in Amount
Decrease in Amount	High Intensity	Low Intensity	Space and Area
Shapes	Speed	Significance	Influence and Strength
Uniqueness	Complexity	Value	Quality
Challenges	Wealth and Success	Poverty and Failure	Appearance
Age	Body Shape	Wellness	Textures
Intelligence	Positive Human Traits	Negative Human Traits	Moral Traits
Emotional Responses	Emotional States	Social Behaviours	Tastes and Smells
Sounds	Temperature	Probability	Relational Actions
Body Language and Gestures	Postures and Positions	Opinions	Thoughts and Decisions
Knowledge and Information	Encouragement and Discouragement	Request and Suggestion	Regret and Sadness
Respect and Approval	Attempt and Prevention	Physical Actions and Reactions	Movements
Commanding and Giving Permissions	Engaging in Verbal Communication	Understanding and Learning	Perceiving The Senses
Resting and Relaxing	Touching and Holding	Eating and Drinking	Preparing Food
Changing and Forming	Organising and Collecting	Creating and Producing	Science
Education	Research	Astronomoy	Physics
Biology	Chemistry	Geology	Psychology
Mathematics	Graphs and Figures	Geometry	Environment
Energy and Power	Landscapes and Geography	Technology	Computer
Internet	Manufacture and Industry	History	Religion
Culture and Custom	Language and Grammar	Arts	Music
Film and Theatre	Literature	Architecture	Marketing
Finance	Management	Medicine	Sickness and Symptoms
Law	Crime	Punishment	Politics
War	Measurement	Positive Emotions	Negative Emotions
Animals	Weather	Food and Drinks	Travel and Tourism
Pollution	Migration	Disasters	Materials
Adverbs of Manner	Adverbs of Comment	Adverbs of Certainty	Adverbs of Frequency
Adverbs of Time	Adverbs of Place	Adverbs of Degree	Adverbs of Emphasis
Adverbs of Purpose and Intention	Conjunctive Adverbs