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Vocabulary

  • have to: Must do
  • look at: To use your eyes to focus on something
  • for example: As an illustration or instance.
  • in other words: Stating something in a different way, often to make it clearer or more understandable.
  • in order to: For the purpose of; with the aim of.
  • at a time: Separately; one by one
  • go ahead: To start an activity; start doing, working etc.
  • in question: Being doubted or disputed; under discussion.
  • in totality: Completely; in the whole or entirety.
  • on the basis of: Because of; using as a reason or justification.
  • based on: To use something as the foundation or starting point for something else.
  • regardless of
  • on the other side of: Located across something from a given point.
  • going on: To continue doing something
  • perspective: Artistic method of creating a sense of distance
  • equivalent: Equal to something in value, use or meaning
  • privilege: Advantage or right given to only certain people
  • realize: To become aware of or understand mentally
  • trick: To fool someone in order to obtain a result
  • determine: To control exactly how something will be or act
  • immediately: Without any delay; straight away
  • priority: Thing that is more important/urgent than others
  • identify: To indicate who or what someone or something is
  • position: Person's opinion or attitude about something
  • represent: To depict art objects, figures, scenes; to portray
  • stress: To emphasize one or more parts of a word, sentence
  • imagine: To think creatively about; form mental picture of
  • method: (Organized and planned) way of doing something
  • molecule: Two or more atoms chemically combined
  • bond: Rope, chain or other thing used to tie someone up
  • reach: To come to or arrive at a goal or destination
  • simply: In an easy or clear manner
  • apply: To spread a substance or liquid over a surface
  • identical: The same in every way
  • swap: To exchange goods without spending money; trade
  • board: Surface for posting or showing information
  • reason: To think and make conclusions in a logical manner
  • switch: A change or shift from one method to another
  • couple: To join something to something else
  • mass: Religious ceremony in some Christian churches
  • mentally: With or in the mind and thoughts
  • assess: To judge something's value or suitability
  • convention: Official agreement between two or more countries
  • oxygen: A gas in the air that we need to breathe
  • orientation: Where you are in a location, e.g. facing east/west
  • absolute: Complete; total; pure; not limited in any way
  • project: To predict what will happen in the future
  • appear: To be seen, become visible; come into sight
  • original: Being first made, thought or performed; fresh
  • carbon: Chemical element with an atomic number of 6
  • place: To put someone in a particular type of situation
  • imply: To suggest something, without saying it directly
  • kind: In a caring and helpful manner
  • hit: To have a negative impact on a person/place/thing
  • assign: To give someone a particular job to do
  • confusion: Not knowing what to do; state of disorder
  • order: Religious or social group, as of nuns
  • spatial: About space
  • dash: To hit against something with a lot of force
  • hydrogen: Lightest of all chemical elements
  • point: An item to be discussed
  • pit: To use your strength, skill or wit to beat another
  • configuration: A shape or outline; a method of arrangement
  • con: To trick or deceive someone
  • rotate: To regularly change people who perform a role
  • wedge: Golf club designed to hit the ball high in the air
  • chlorine: Greenish-yellow gas with a strong smell
  • reiterate: To say something again for further emphasis
  • invert: To turn the order of things backwards
  • totality: State of being total and complete
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  • not found vocabularyNo vocabulary matches your filters
    • absolute

      US /ˈæbsəˌlut/

      UK /ˈæbsəlu:t/

      • Adjective
      • Complete; total; pure; not limited in any way
      • Not capable of being doubted or questioned; certain.
      • Noun (Countable/Uncountable)
      • Something that is complete, total, pure, certain
      • (in philosophy) a concept of an ultimate, unconditional reality
      A2
      More
    • assess

      US /əˈsɛs/

      UK /əˈses/

      • Transitive Verb
      • To judge something's value or suitability
      A2TOEIC
      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
    • at a time

      US /æt e taɪm/

      UK /æt ə taim/

      • Phrase
      • Separately; one by one
      • Simultaneously; together
      A1
      More
    • based on

      US

      UK

      • Phrasal Verb
      • To use something as the foundation or starting point for something else.
      • Preposition
      • Using something as the main idea or foundation.
      • Relying on something as evidence or justification.
      A1
      More
    • bond

      US /bɑnd/

      UK /bɒnd/

      • Noun (Countable/Uncountable)
      • Rope, chain or other thing used to tie someone up
      • Closeness that is shared between people or groups
      • Verb (Transitive/Intransitive)
      • To develop a close relationship with
      • To become joined or connected, e.g. using glue
      A2TOEIC
      More
    • carbon

      US /ˈkɑrbən/

      UK /'kɑ:bən/

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

      US /ˈklɔːrˌiːn/

      UK /ˈklɔ:ri:n/

      • Uncountable Noun
      • Greenish-yellow gas with a strong smell
      B2
      More
    • con

      US /kɑ:n/

      UK /kɒn/

      • Transitive Verb
      • To trick or deceive someone
      • Noun
      • Argument pointing out the negatives of a position
      B2
      More
    • configuration

      US /kənˌfɪɡjəˈreʃən/

      UK /kənˌfɪgəˈreɪʃn/

      • Noun
      • A shape or outline; a method of arrangement
      B2
      More
    • confusion

      US /kənˈfjuʒən/

      UK /kən'fju:ʒən/

      • Uncountable Noun
      • Not knowing what to do; state of disorder
      B1
      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
    • couple

      US /ˈkʌpəl/

      UK /'kʌpl/

      • Transitive Verb
      • To join something to something else
      • (Two animals) to engage in sexual relations
      • Noun (Countable/Uncountable)
      • Two people in a romantic relationship
      • Two of something; two people; a pair
      A2
      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
    • 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
    • equivalent

      US /ɪˈkwɪvələnt/

      UK /ɪˈkwɪvələnt/

      • Adjective
      • Equal to something in value, use or meaning
      • Having the same meaning or significance.
      • Noun
      • Thing like another in quality, quantity or degree
      B1TOEIC
      More
    • for example

      US

      UK

      • Phrase
      • As an illustration or instance.
      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
    • going on

      US /ˈɡoɪŋ ɑn/

      UK /ˈgəʊɪŋ ɔn/

      • Phrasal Verb
      • To continue doing something
      • To happen (usually negative)
      A1
      More
    • have to

      US /hæv tu/

      UK /ˈhæv tə/

      • Auxiliary Verb
      • Must do
      A1
      More
    • hydrogen

      US /ˈhaɪdrədʒən/

      UK /ˈhaɪdrədʒən/

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

      US /aɪˈdɛntɪkəl/

      UK /aɪˈdentɪkl/

      • Adjective
      • The same in every way
      • Satisfied by all values of the variables involved.
      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 order to

      US /ɪn ˈɔrdɚ tu/

      UK /in ˈɔ:də tu:/

      • Preposition
      • For the purpose of; with the aim of.
      • Phrase
      • In a specific sequence or arrangement.
      • With the aim of; for the purpose of.
      C1
      More
    • in other words

      US

      UK

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

      US /ɪn ˈkwɛstʃən/

      UK /in ˈkwestʃən/

      • Adjective
      • Being doubted or disputed; under discussion.
      • Referring to someone or something that has already been mentioned.
      A1
      More
    • in totality

      US /ɪn toʊˈtælɪti/

      UK /ɪn təuˈtælɪti/

      • other
      • Completely; in the whole or entirety.
      C1
      More
    • invert

      US /ɪnˈvɜ:rt/

      UK /ɪnˈvɜ:t/

      • Transitive Verb
      • To turn the order of things backwards
      B2
      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
    • mass

      US /mæs/

      UK /mæs/

      • Noun (Countable/Uncountable)
      • Religious ceremony in some Christian churches
      • Large amount or number of something
      • Transitive Verb
      • To gather people or things into a large group
      B1
      More
    • mentally

      US /ˈmɛntl:ɪ/

      UK /ˈmentəli/

      • Adverb
      • With or in the mind and thoughts
      A2
      More
    • method

      US /ˈmɛθəd/

      UK /'meθəd/

      • Noun (Countable/Uncountable)
      • (Organized and planned) way of doing something
      • Orderliness of thought, arrangement, or behavior.
      A2TOEIC
      More
    • molecule

      US /ˈmɑlɪˌkjul/

      UK /ˈmɒlɪkju:l/

      • Noun
      • Two or more atoms chemically combined
      B2
      More
    • on the basis of

      US

      UK

      • Phrase
      • Because of; using as a reason or justification.
      A1
      More
    • on the other side of

      US /ɑn ði ˈʌðɚ ˈsaɪd ʌv/

      UK /ɒn ði ˈʌðə ˈsaɪd ɒv/

      • Preposition
      • Located across something from a given point.
      A2
      More
    • orientation

      US /ˌɔriɛnˈteʃən, -ən-, ˌor-/

      UK /ˌɔ:riənˈteɪʃn/

      • Noun
      • Where you are in a location, e.g. facing east/west
      • Process of giving information about something new
      B1
      More
    • original

      US /əˈrɪdʒənəl/

      UK /ə'rɪdʒənl/

      • Adjective
      • Being first made, thought or performed; fresh
      • Being unique or thinking differently from others
      • Noun (Countable/Uncountable)
      • A work of art, writing, or music that is not a copy.
      • A person of fresh initiative or inventiveness.
      A2TOEIC
      More
    • oxygen

      US /ˈɑksɪdʒən/

      UK /'ɒksɪdʒən/

      • Uncountable Noun
      • A gas in the air that we need to breathe
      • Oxygen administered as a medical treatment.
      B1
      More
    • perspective

      US /pɚˈspɛktɪv/

      UK /pə'spektɪv/

      • Noun (Countable/Uncountable)
      • Artistic method of creating a sense of distance
      • Ability to understand what is important in life
      B1TOEIC
      More
    • pit

      US /pɪt/

      UK /pɪt/

      • Transitive Verb
      • To use your strength, skill or wit to beat another
      • To make holes or marks on a surface
      • Noun
      • Hole in the ground
      • Garage area for racing cars on a circuit
      B1
      More
    • priority

      US /praɪˈɔrɪti, -ˈɑr-/

      UK /praɪ'ɒrətɪ/

      • Noun (Countable/Uncountable)
      • Thing that is more important/urgent than others
      • A level of importance assigned to a task or process in a computer system.
      • Adjective
      • Denoting something that constitutes a priority.
      B1TOEIC
      More
    • privilege

      US /ˈprɪvəlɪdʒ, ˈprɪvlɪdʒ/

      UK /'prɪvəlɪdʒ/

      • Noun (Countable/Uncountable)
      • Advantage or right given to only certain people
      • An opportunity to do something special or enjoyable.
      • Transitive Verb
      • To give advantages to some people not others
      B1TOEIC
      More
    • reach

      US /ritʃ/

      UK /ri:tʃ/

      • Verb (Transitive/Intransitive)
      • To come to or arrive at a goal or destination
      • To be long enough to get to a certain place
      • Uncountable Noun
      • Power or control someone has over something
      A2TOEIC
      More
    • regardless of

      US /rɪˈɡɑrdlɪs ʌv/

      UK /riˈɡɑ:dlis ɔv/

      • Phrase
      • Preposition
      • Without being affected or influenced by something; despite.
      A2
      More
    • reiterate

      US /riˈɪtəˌret/

      UK /rɪ'ɪtəreɪt/

      • Transitive Verb
      • To say something again for further emphasis
      B2TOEIC
      More
    • represent

      US /ˌrɛprɪˈzɛnt/

      UK /ˌreprɪ'zent/

      • Transitive Verb
      • To depict art objects, figures, scenes; to portray
      • To show or describe something in a particular way
      A2TOEIC
      More
    • rotate

      US /ˈroʊteɪt/

      UK /rəʊˈteɪt/

      • Verb (Transitive/Intransitive)
      • To regularly change people who perform a role
      • To regularly change the crops that grow in a field
      B2
      More
    • spatial

      US /ˈspeʃəl/

      UK /ˈspeɪʃl/

      • Adjective
      • About space
      B1
      More
    • stress

      US / strɛs/

      UK /stres/

      • Transitive Verb
      • To emphasize one or more parts of a word, sentence
      • To put pressure on something or someone
      • Noun (Countable/Uncountable)
      • Emphasis on part of a word or sentence
      • Pressure on something or someone
      A2TOEIC
      More
    • swap

      US /swɑp/

      UK /swɒp/

      • Transitive Verb
      • To exchange goods without spending money; trade
      • Noun
      • A trade or exchange of goods without using money
      B2TOEIC
      More
    • switch

      US /swɪtʃ/

      UK /swɪtʃ/

      • Noun
      • A change or shift from one method to another
      • Thing you move to turn electrical items on or off
      • Transitive Verb
      • To exchange or replace something for another thing
      A2TOEIC
      More
    • totality

      US /toʊˈtæləti/

      UK /təʊˈtæləti/

      • Uncountable Noun
      • State of being total and complete
      B2
      More
    • trick

      US /trɪk/

      UK /trɪk/

      • Transitive Verb
      • To fool someone in order to obtain a result
      • To playfully tease or fool to make someone laugh
      • Noun (Countable/Uncountable)
      • Act of trying to fool someone
      • Quick or skillful way of doing something
      A2
      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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    B1US
    #hydrogen#atom#priority#carbon#configuration#molecule

    Cahn-Ingold-Prelog Convention (Determining R/S)

    0
    Ken Lee posted on 2026/08/25
    Ever wondered how chemists tell molecules apart? This video breaks down the Cahn-Ingold-Prelog convention, showing you exactly how to assign R/S configurations to chiral centers. You'll learn to prioritize groups based on atomic mass and even pick up handy tricks for visualizing tricky molecular orientations!

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