Vocabulary

  • have to: Must do
  • from now on: Starting at this moment and continuing indefinitely into the future.
  • off of: From a position on something; down from.
  • in general: Typically; usually; on the whole.
  • used to: Did regularly before, but don't do now
  • look at: To use your eyes to focus on something
  • in the world: Used to emphasize a question expressing surprise, confusion, disbelief
  • talking about: To discuss a particular topic.
  • come up with: To think of an idea or solution; produce
  • in other words: Stating something in a different way, often to make it clearer or more understandable.
  • depending on: To rely on for support (financial or emotional)
  • to do with: To be about something; concern
  • go ahead: To start an activity; start doing, working etc.
  • around the world: In or to many countries.
  • stuff: Generic description for things, materials, objects
  • pattern: Model to follow in making or doing something
  • straight: Not having curves, bends, or angles
  • determine: To control exactly how something will be or act
  • arbitrary: (Of decisions) unsupported; without any evidence
  • completely: In every way or as much as possible
  • general: Widespread, normal or usual
  • familiar: Well-known or easily recognized
  • identify: To indicate who or what someone or something is
  • molecule: Two or more atoms chemically combined
  • bit: Device put in a horse's mouth to control it
  • occur: To come to pass or to happen
  • draw: To attract attention to someone or something
  • formula: A mathematical or scientific rule
  • explain: To make clear or easy to understand by describing
  • direction: When someone tells people what to do
  • refer: To talk about or write about something
  • account: An advantage
  • board: Surface for posting or showing information
  • pretty: Being attractive to the eye in a simple way
  • communicate: To give and exchange information
  • reason: To think and make conclusions in a logical manner
  • convention: Official agreement between two or more countries
  • organic: Developing naturally and without a set structure
  • explicitly: Clearly; specifically
  • leave: To go away from; depart
  • haven: Place where people can feel safe and happy
  • carbon: Chemical element with an atomic number of 6
  • important: Having power or authority
  • single: One run in cricket or a hit baseball
  • methane: Colorless gas without smell often used as fuel
  • imply: To suggest something, without saying it directly
  • kind: In a caring and helpful manner
  • assign: To give someone a particular job to do
  • extend: To offer something (help, friendship) to someone
  • learn: To get knowledge or skills by study or experience
  • memorize: To study something so that you remember it
  • pure: Not mixed with anything else
  • organization: Group of people with a particular purpose
  • chemistry: The study of the structure of substances
  • dash: To hit against something with a lot of force
  • hydrogen: Lightest of all chemical elements
  • prop: Moveable item used on the set of a theater/film
  • atom: Smallest bit that matter can be broken down into
  • molecular: About or caused by molecules
  • saturate: To cause a liquid to not be able to absorb more
  • location: Particular position or area of place, event, etc.
  • geometry: Mathematical study of shapes, surfaces, and space
  • wedge: Golf club designed to hit the ball high in the air
  • suffix: Part of a word after the root, e.g. -ment, -ly
  • triple: Group or set of three
  • prefix: Part of a word added to the front, e.g. UNhappy
  • notation: Set of written signs are used in music or math
  • hex: An evil spell put on someone
  • hydrocarbon: Organic compound consisting of hydrogen and carbon
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  • not found vocabularyNo vocabulary matches your filters
    • arbitrary

      US /ˈɑrbɪˌtrɛri/

      UK /ˈɑ:bitrəri/

      • Adjective
      • (Of decisions) unsupported; without any evidence
      • Based on random choice or personal whim, rather than any reason or system.
      B1TOEIC
      More
    • around the world

      US /əˈraʊnd ði wɜrld/

      UK /əˈraund ðə wɜː(r)ld/

      • Phrase
      • In or to many countries.
      • In various places throughout the world.
      A2
      More
    • assign

      US /əˈsaɪn/

      UK /ə'saɪn/

      • Transitive Verb
      • To give someone a particular job to do
      • To give someone credit or blame for something
      B2TOEIC
      More
    • atom

      US /ˈætəm/

      UK /'ætəm/

      • Noun
      • Smallest bit that matter can be broken down into
      B1
      More
    • carbon

      US /ˈkɑrbən/

      UK /'kɑ:bən/

      • Uncountable Noun
      • Chemical element with an atomic number of 6
      B1
      More
    • chemistry

      US /ˈkɛmɪstri/

      UK /'kemɪstrɪ/

      • Uncountable Noun
      • The study of the structure of substances
      B1
      More
    • come up with

      US /kʌm ʌp wɪð/

      UK /kʌm ʌp wið/

      • Phrasal Verb
      • To think of an idea or solution; produce
      A1
      More
    • communicate

      US /kəˈmjunɪˌket/

      UK /kə'mju:nɪkeɪt/

      • Verb (Transitive/Intransitive)
      • To give and exchange information
      • To convey or make known (information, feelings, etc.)
      A2
      More
    • convention

      US /kənˈvɛnʃən/

      UK /kənˈvenʃn/

      • Noun (Countable/Uncountable)
      • Official agreement between two or more countries
      • Large formal assembly, e.g. to make laws
      • Adjective
      • Concerning a large formal assembly or meeting
      A2TOEIC
      More
    • dash

      US /dæʃ/

      UK /dæʃ/

      • Verb (Transitive/Intransitive)
      • To hit against something with a lot of force
      • To destroy or damage a feeling, such as hope
      • Noun
      • Hyphen e.g. '-'; or space
      • Act of running quickly towards a particular place
      B1TOEIC
      More
    • depending on

      US

      UK

      • Phrasal Verb
      • To rely on for support (financial or emotional)
      • Influenced or determined by.
      • Preposition
      • Subject to; contingent on
      • Relying on someone or something for support or assistance.
      A2
      More
    • determine

      US /dɪˈtɚmɪn/

      UK /dɪ'tɜ:mɪn/

      • Transitive Verb
      • To control exactly how something will be or act
      • To establish the facts about; discover
      A2TOEIC
      More
    • direction

      US /dɪˈrɛkʃən, daɪ-/

      UK /də'rekʃn/

      • Noun (Countable/Uncountable)
      • When someone tells people what to do
      • Describes the way you are going, e.g. North
      A2TOEIC
      More
    • explicitly

      US /ɪk'splɪsɪtlɪ/

      UK /ɪk'splɪsɪtlɪ/

      • Adverb
      • Clearly; specifically
      • Directly and unambiguously expressed or stated.
      B1
      More
    • extend

      US /ɪkˈstɛnd/

      UK /ɪkˈstend/

      • Transitive Verb
      • To offer something (help, friendship) to someone
      • To reach from one point to another
      A2TOEIC
      More
    • familiar

      US /fəˈmɪljɚ/

      UK /fəˈmɪliə(r)/

      • Adjective
      • Well-known or easily recognized
      • Having a good knowledge of something.
      • Noun
      • A close friend or associate.
      • (In folklore) a spirit, often in animal form, believed to attend and serve a witch.
      A2TOEIC
      More
    • formula

      US /ˈfɔrmjələ/

      UK /'fɔ:mjələ/

      • Noun (Countable/Uncountable)
      • A mathematical or scientific rule
      • Plan, rule or method for doing or making something
      A2TOEIC
      More
    • from now on

      US /frʌm naʊ ɑn/

      UK /frɔm nau ɔn/

      • Phrase
      • Starting at this moment and continuing indefinitely into the future.
      A1
      More
    • geometry

      US /dʒiˈɑ:mətri/

      UK /dʒiˈɒmətri/

      • Uncountable Noun
      • Mathematical study of shapes, surfaces, and space
      • Mathematical shape of something
      B2
      More
    • go ahead

      US /ɡo əˈhɛd/

      UK /ɡəu əˈhed/

      • Phrasal Verb
      • To start an activity; start doing, working etc.
      • To give permission to do something
      • Intransitive Verb
      • To start or proceed with something
      • To proceed despite potential obstacles or doubts.
      A1
      More
    • have to

      US /hæv tu/

      UK /ˈhæv tə/

      • Auxiliary Verb
      • Must do
      A1
      More
    • hex

      US /heks/

      UK /heks/

      • Noun
      • An evil spell put on someone
      • Abbreviation
      • hexagon's abbreviation; a shape with six straight sides.
      C2
      More
    • hydrocarbon

      US /ˌhaɪdrəˈkɑ:rbən/

      UK /ˌhaɪdrəˈkɑ:bən/

      • Noun
      • Organic compound consisting of hydrogen and carbon
      C2
      More
    • hydrogen

      US /ˈhaɪdrədʒən/

      UK /ˈhaɪdrədʒən/

      • Uncountable Noun
      • Lightest of all chemical elements
      B1
      More
    • identify

      US /aɪˈdɛntəˌfaɪ/

      UK /aɪ'dentɪfaɪ/

      • Transitive Verb
      • To indicate who or what someone or something is
      • To say exactly what something is
      B1TOEIC
      More
    • imply

      US /ɪmˈplaɪ/

      UK /ɪmˈplaɪ/

      • Transitive Verb
      • To suggest something, without saying it directly
      • To involve or indicate by inference, association, or necessary consequence rather than by direct statement
      A2TOEIC
      More
    • in general

      US /ɪn ˈdʒɛnərəl/

      UK /in ˈdʒenərəl/

      • Phrase
      • Typically; usually; on the whole.
      • Not specific or detailed; broadly.
      • Adjective
      • Not detailed or specific; overall.
      C2
      More
    • in other words

      US

      UK

      • Phrase
      • Stating something in a different way, often to make it clearer or more understandable.
      More
    • in the world

      US /ɪn ði wɜrld/

      UK /in ðə wɜː(r)ld/

      • Phrase
      • Used to emphasize a question expressing surprise, confusion, disbelief
      • Used to indicate the extent or degree of something, often in a superlative sense
      A1
      More
    • location

      US /loʊˈkeɪʃn/

      UK /ləʊˈkeɪʃn/

      • Noun (Countable/Uncountable)
      • Particular position or area of place, event, etc.
      • A place away from a studio where film or television shots are made.
      B1TOEIC
      More
    • look at

      US /lʊk æt/

      UK /luk æt/

      • Phrasal Verb
      • To use your eyes to focus on something
      • To focus your eyes on something carefully
      A1
      More
    • memorize

      US /ˈmɛməˌraɪz/

      UK /ˈmeməraɪz/

      • Transitive Verb
      • To study something so that you remember it
      A2
      More
    • methane

      US /ˈmeθeɪn/

      UK /ˈmi:θeɪn/

      • Uncountable Noun
      • Colorless gas without smell often used as fuel
      B2
      More
    • molecular

      US /məˈlɛkjəlɚ/

      UK /mə'lekjələ(r)/

      • Adjective
      • About or caused by molecules
      B2
      More
    • molecule

      US /ˈmɑlɪˌkjul/

      UK /ˈmɒlɪkju:l/

      • Noun
      • Two or more atoms chemically combined
      B2
      More
    • notation

      US /noˈteʃən/

      UK /nəʊ'teɪʃn/

      • Noun
      • Set of written signs are used in music or math
      C2
      More
    • occur

      US /əˈkɚ/

      UK /əˈkɜ:(r)/

      • Intransitive Verb
      • To come to pass or to happen
      • To be found to exist; to be present.
      A2TOEIC
      More
    • off of

      US /ɔf ʌv/

      UK /ɔf ɔv/

      • Preposition
      • From a position on something; down from.
      A1
      More
    • organic

      US /ɔrˈɡænɪk/

      UK /ɔ:ˈgænɪk/

      • Adjective
      • Developing naturally and without a set structure
      • Concerning food made with few or no chemicals
      B1
      More
    • organization

      US /ˌɔrɡənɪˈzeʃən/

      UK /ˌɔ:gənaɪˈzeɪʃn/

      • Noun (Countable/Uncountable)
      • Group of people with a particular purpose
      • The way in which something is structured or arranged.
      A2
      More
    • pattern

      US /ˈpætən/

      UK /'pætn/

      • Noun (Countable/Uncountable)
      • Model to follow in making or doing something
      • Colors or shapes which are repeated on objects
      • Transitive Verb
      • To copy the way something else is made
      • To decorate with a pattern.
      A2TOEIC
      More
    • prefix

      US /ˈpriˌfɪks/

      UK /'pri:fɪks/

      • Noun
      • Part of a word added to the front, e.g. UNhappy
      B2
      More
    • prop

      US /prɑp/

      UK /prɒp/

      • Countable Noun
      • Moveable item used on the set of a theater/film
      • Transitive Verb
      • To support an object so it doesn't fall down
      B2
      More
    • pure

      US /pjʊr/

      UK /pjʊə(r)/

      • Adjective
      • Not mixed with anything else
      • Being morally good
      A2
      More
    • refer

      US /rɪˈfɚ/

      UK /rɪ'fɜ:(r)/

      • Verb (Transitive/Intransitive)
      • To talk about or write about something
      • To give information about something
      A2TOEIC
      More
    • saturate

      US /ˈsætʃəˌret/

      UK /ˈsætʃəreɪt/

      • Transitive Verb
      • To cause a liquid to not be able to absorb more
      • To try to fill up e.g. a market
      B2
      More
    • straight

      US /stret/

      UK /streɪt/

      • Adjective
      • Not having curves, bends, or angles
      • Not gay; heterosexual
      • Adverb
      • in a line; immediately; honestly and directly
      • In a straight line; directly.
      A2TOEIC
      More
    • stuff

      US /stʌf/

      UK /stʌf/

      • Uncountable Noun
      • Generic description for things, materials, objects
      • Transitive Verb
      • To push material inside something, with force
      B1
      More
    • suffix

      US /ˈsʌfɪks/

      UK /ˈsʌfɪks/

      • Noun
      • Part of a word after the root, e.g. -ment, -ly
      B2
      More
    • talking about

      US

      UK

      • Phrasal Verb
      • To discuss a particular topic.
      • To be constantly mentioning or bringing up a subject.
      A1
      More
    • to do with

      US

      UK

      • Phrasal Verb
      • To be about something; concern
      A1
      More
    • triple

      US /ˈtrɪpəl/

      UK /ˈtrɪpl/

      • Noun
      • Group or set of three
      • A hit in baseball that enables the batter to reach third base.
      • Transitive Verb
      • To multiply by three; to increase threefold.
      B2
      More
    • used to

      US /juzd tu/

      UK /ˈju:st tə/

      • Adjective
      • Did regularly before, but don't do now
      • Auxiliary Verb
      • Have done before, but do not do now
      A1
      More
    • wedge

      US /wɛdʒ/

      UK /wedʒ/

      • Countable Noun
      • Golf club designed to hit the ball high in the air
      • Triangular shape with a sharp point
      • Transitive Verb
      • To push something forcefully into a narrow space
      • To place something under a door to keep it open
      B2
      More
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    01:03

    She took a brave step forward, leaving behind her comfort zone to chase her dreams.

    Vocabulary
    • brave

      adj. Having courage

    • comfort zone

      phr. A familiar situation where one feels safe

    Explanation
    a brave step is a noun phrase, where brave is an adjective modifying the noun step, meaning "a courageous step". forward is an adverb modifying step, meaning "ahead". The whole phrase serves as the object, answering the "what" of took (verb) — she took a brave step forward.

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    brave

    US/brev/
    UK/breɪv/
    adj.Brave
    v.t.To bravely face
    A2 Elementary

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    A2US
    #molecule#carbon#methyl#butane#chemistry#chain

    IUPAC Nomenclature of Alkanes: Part 1

    0
    Ken Lee posted on 2026/08/25
    Ever wondered how chemists name molecules? This video breaks down the basics of IUPAC nomenclature for alkanes, showing you how to read and draw chemical structures using line notation. You'll learn essential terms like 'alkane,' 'suffix,' and 'substituent' to confidently discuss organic chemistry!

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