Vocabulary

  • up there: In or to a higher place or position; far away.
  • kick off: To start a football match.
  • instead of: When one thing is replaced by another
  • look at: To use your eyes to focus on something
  • in any case: Whatever happens; regardless of what has happened or may happen.
  • all along: From the beginning; all the time.
  • have to: Must do
  • back down: To admit you were wrong; stop claiming
  • rather than: More exactly; more correctly
  • point out: To make others aware of an idea
  • go ahead: To start an activity; start doing, working etc.
  • flip over: To turn something over quickly, with a sudden movement.
  • going on: To continue doing something
  • stuff: Generic description for things, materials, objects
  • individual: Single person, looked at separately from others
  • grab: To take and hold something quickly
  • disorder: State of confusion or a lack of organization
  • flip: To turn your body in the air, as in gymnastics
  • structure: The way in which the parts of a system or object are arranged or organized, or a system arranged in this way
  • negative: The opposite to a positive electrical charge
  • position: Person's opinion or attitude about something
  • imagine: To think creatively about; form mental picture of
  • suppose: To imagine or guess what might happen
  • relationship: Connection between two or more people or things
  • compound: Series of buildings that are walled or fenced off
  • molecule: Two or more atoms chemically combined
  • feature: Special report in a magazine or paper
  • exist: To be present, alive or real
  • bond: Rope, chain or other thing used to tie someone up
  • prime: To get a person ready for; prepare someone
  • portion: Serving of food that is intended for one person
  • proximity: State of being near or close to something
  • regular: Having an equal amount of space or time in between
  • mention: To refer to or talk or write about something
  • draw: To attract attention to someone or something
  • dramatically: In a sudden or extreme manner
  • explain: To make clear or easy to understand by describing
  • vicinity: Surrounding or nearby region; proximity
  • charge: To run quickly toward someone to attack them
  • effect: An advantage, benefit
  • reaction: Bodily response to a drug or something eaten
  • suddenly: In an unexpected or very quick manner
  • reason: To think and make conclusions in a logical manner
  • break: To create a new record e.g. running the 100m dash
  • magnitude: Number representing force of an earthquake
  • produce: Fresh foods such as fruits and vegetables
  • solution: Mix of a liquid and a solid or a gas
  • formal: Observing rules and procedures strictly
  • intermediate: Between; in the middle; moderate
  • lot: What happens to a person in life from chance; fate
  • channel: Long hole dug in the ground, e.g. to move water
  • carbon: Chemical element with an atomic number of 6
  • learn: To get knowledge or skills by study or experience
  • simple: Not hard to understand or do; not complex
  • act: To behave in a certain way
  • chemistry: The study of the structure of substances
  • support: To give assistance or advice to someone
  • hydrogen: Lightest of all chemical elements
  • density: Degree to which an area is filled or covered
  • resonance: Continuing to make a loud clear deep sound
  • acidic: Containing acid
  • location: Particular position or area of place, event, etc.
  • acidity: Level to which something is acidic
  • favorable: When a good result or positive outcome is likely
  • flatten: To make level and spread out over a surface
  • condensation: Act of shortening something
  • composite: Made of more than one different part
  • proton: Tiny part of atom with positive electrical charge
  • electron: A negatively charged particle
  • alpha: First letter in the Greek alphabet
  • beta: Test version of a product or software
  • ester: Compound of acid and alcohol with water taken out
  • pi: The ratio of the circumference to the diameter
  • sigma: 18th letter of the Greek alphabet -
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  • not found vocabularyNo vocabulary matches your filters
    • acidic

      US /əˈsɪdɪk/

      UK /əˈsɪdɪk/

      • Adjective
      • Containing acid
      B1
      More
    • acidity

      US /əˈsɪdɪti/

      UK /əˈsɪdəti/

      • Uncountable Noun
      • Level to which something is acidic
      B1
      More
    • all along

      US /ɔl əˈlɔŋ/

      UK /ɔ:l əˈlɔŋ/

      • Adverb
      • From the beginning; all the time.
      • Phrase
      • In a line parallel to something long.
      A2
      More
    • alpha

      US /'ælfə/

      UK /ˈælfə/

      • Noun
      • First letter in the Greek alphabet
      • Adjective
      • Most powerful (animals of the same sex)
      B1
      More
    • back down

      US /bæk daʊn/

      UK /bæk daun/

      • Phrasal Verb
      • To admit you were wrong; stop claiming
      A1
      More
    • beta

      US /'beɪtə/

      UK /'bi:tə/

      • Noun
      • Test version of a product or software
      B2
      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
    • channel

      US /ˈtʃænəl/

      UK /'tʃænl/

      • Noun (Countable/Uncountable)
      • Long hole dug in the ground, e.g. to move water
      • TV or radio station or its programs
      • Transitive Verb
      • To dig a long hole for carrying water
      • To send (e.g. money) to a certain place or person
      B1
      More
    • charge

      US /tʃɑrdʒ/

      UK /tʃɑ:dʒ/

      • Verb (Transitive/Intransitive)
      • To run quickly toward someone to attack them
      • To ask for money as a price for a service or goods
      • Noun (Countable/Uncountable)
      • An attack by running quickly toward someone
      • A price for a service or goods
      A2
      More
    • chemistry

      US /ˈkɛmɪstri/

      UK /'kemɪstrɪ/

      • Uncountable Noun
      • The study of the structure of substances
      B1
      More
    • composite

      US /kəmˈpɑzɪt/

      UK /'kɒmpəzɪt/

      • Adjective
      • Made of more than one different part
      • Noun
      • Something made up of more than one different part
      B2
      More
    • compound

      US /kɑmˈpaUnd/

      UK /'kɒmpaʊnd/

      • Noun (Countable/Uncountable)
      • Series of buildings that are walled or fenced off
      • Chemical made up of several others
      • Transitive Verb
      • To pay interest on a loan including the interest
      • To make something from various parts or components
      B1
      More
    • condensation

      US /ˌkɑ:ndenˈseɪʃn/

      UK /ˌkɒndenˈseɪʃn/

      • Uncountable Noun
      • Act of shortening something
      • Drops of water on a surface, as produced by steam
      B2
      More
    • density

      US /ˈdɛnsɪti/

      UK /ˈdensəti/

      • Noun (Countable/Uncountable)
      • Degree to which an area is filled or covered
      • The degree of compactness of a substance.
      C1TOEIC
      More
    • disorder

      US /dɪsˈɔrdɚ/

      UK /dɪs'ɔ:də(r)/

      • Uncountable Noun
      • State of confusion or a lack of organization
      • Illness when the body is not functioning well
      • Transitive Verb
      • To disrupt the order or arrangement of something.
      B2
      More
    • dramatically

      US /drəˈmætɪkl:ɪ/

      UK /drə'mætɪklɪ/

      • Adverb
      • In a sudden or extreme manner
      • In a theatrical or exaggerated manner.
      B1
      More
    • electron

      US /ɪˈlektrɑ:n/

      UK /ɪˈlektrɒn/

      • Countable Noun
      • A negatively charged particle
      B2
      More
    • ester

      US

      UK

      • Noun
      • Compound of acid and alcohol with water taken out
      C1
      More
    • favorable

      US /ˈfevərəbəl, ˈfevrə-/

      UK /'feɪvərəbl/

      • Adjective
      • When a good result or positive outcome is likely
      B2TOEIC
      More
    • feature

      US /ˈfitʃɚ/

      UK /'fi:tʃə(r)/

      • Noun (Countable/Uncountable)
      • Special report in a magazine or paper
      • Distinctive or important point of something
      • Transitive Verb
      • To highlight or give special importance to
      • To give prominence to; to present or promote as a special or important item.
      A2TOEIC
      More
    • flatten

      US /ˈflætn:/

      UK /'flætn/

      • Transitive Verb
      • To make level and spread out over a surface
      B1
      More
    • flip

      US /flɪp/

      UK /flɪp/

      • Verb (Transitive/Intransitive)
      • To turn your body in the air, as in gymnastics
      • To move into a different position quickly
      • Noun
      • Act of turning your body in the air; somersault
      • Movement of something from one position to another
      B2
      More
    • flip over

      US

      UK

      • Phrasal Verb
      • To turn something over quickly, with a sudden movement.
      • To turn upside down or onto its side, especially a vehicle.
      More
    • formal

      US / ˈfɔrməl/

      UK /'fɔ:ml/

      • Adjective
      • Observing rules and procedures strictly
      • Behaving well, politely; wearing your best clothes
      A2TOEIC
      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
    • grab

      US /ɡræb/

      UK /ɡræb/

      • Transitive Verb
      • To take and hold something quickly
      A2
      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
    • in any case

      US /ɪn ˈɛni kes/

      UK /in ˈeni keis/

      • Phrase
      • Whatever happens; regardless of what has happened or may happen.
      A1
      More
    • individual

      US /ˌɪndəˈvɪdʒuəl/

      UK /ˌɪndɪˈvɪdʒuəl/

      • Countable Noun
      • Single person, looked at separately from others
      • A single thing or item, especially when part of a set or group.
      • Adjective
      • Made for use by one single person
      • Having a distinct manner different from others
      A2
      More
    • instead of

      US /ɪnˈstɛd ʌv/

      UK /inˈsted ɔv/

      • Preposition
      • When one thing is replaced by another
      • Adverb
      • As a substitute or alternative.
      A1
      More
    • intermediate

      US /ˌɪntɚˈmidiɪt/

      UK /ˌɪntəˈmi:diət/

      • Adjective
      • Between; in the middle; moderate
      • Having some knowledge but not advanced
      • Noun (Countable/Uncountable)
      • Person with some knowledge but not advanced
      • Something that comes between two things in time, place, character, etc.
      B1
      More
    • kick off

      US /kɪk ɔf/

      UK /kik ɔf/

      • Verb (Transitive/Intransitive)
      • To start a football match.
      • To start a campaign or event.
      • Phrasal Verb
      • To begin or start something.
      • To remove (shoes) by kicking.
      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
    • magnitude

      US /ˈmæɡnɪˌtud, -ˌtjud/

      UK /ˈmægnɪtju:d/

      • Noun
      • Number representing force of an earthquake
      • Size or importance
      B2
      More
    • mention

      US /ˈmɛnʃən/

      UK /'menʃn/

      • Transitive Verb
      • To refer to or talk or write about something
      • Uncountable Noun
      • Act of referring to or talking about something
      • A formal acknowledgement of something
      A2TOEIC
      More
    • molecule

      US /ˈmɑlɪˌkjul/

      UK /ˈmɒlɪkju:l/

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

      US /ˈnɛɡətɪv/

      UK /'neɡətɪv/

      • Noun
      • The opposite to a positive electrical charge
      • In grammar, containing words such as 'no' or 'not'
      • Adjective
      • Being harmful, unwanted or unhelpful
      • In mathematics, being less than zero
      A2
      More
    • pi

      US /paɪ/

      UK /paɪ/

      • Noun
      • The ratio of the circumference to the diameter
      B2
      More
    • point out

      US /pɔɪnt aʊt/

      UK /pɔint aut/

      • Phrasal Verb
      • To make others aware of an idea
      • To draw attention to something or someone
      A1
      More
    • portion

      US /ˈpɔrʃən, ˈpor-/

      UK /'pɔ:ʃn/

      • Noun (Countable/Uncountable)
      • Serving of food that is intended for one person
      • Part of something shared that belongs to a whole
      • Transitive Verb
      • To separate something to divide among people
      B1
      More
    • prime

      US /praɪm/

      UK /praɪm/

      • Transitive Verb
      • To get a person ready for; prepare someone
      • To coat with paint to prepare it for the main coat
      • Adjective
      • Concerning the highest in quality or value
      • Concerning the highest level of achievement
      A2TOEIC
      More
    • proton

      US /ˈproʊtɑ:n/

      UK /ˈprəʊtɒn/

      • Countable Noun
      • Tiny part of atom with positive electrical charge
      B2
      More
    • proximity

      US /prɑkˈsɪmɪti/

      UK /prɒk'sɪmətɪ/

      • Uncountable Noun
      • State of being near or close to something
      B2TOEIC
      More
    • rather than

      US

      UK

      • Adverb
      • More exactly; more correctly
      • Preferably; instead
      • Preposition
      • Instead of
      A1
      More
    • reaction

      US /riˈækʃən/

      UK /rɪ'ækʃn/

      • Noun
      • Bodily response to a drug or something eaten
      • Feeling or action in response to something
      A2
      More
    • regular

      US /ˈrɛɡjəlɚ/

      UK /ˈregjələ(r)/

      • Adjective
      • Having an equal amount of space or time in between
      • Occurring or being done frequently
      • Noun (Countable/Uncountable)
      • Customers who frequently visit a place
      • Soldier who has a permanent job in the army
      A2TOEIC
      More
    • relationship

      US /rɪˈleʃənˌʃɪp/

      UK /rɪˈleɪʃnʃɪp/

      • Noun (Countable/Uncountable)
      • Connection between two or more people or things
      • Way people interact or live with each other
      A2TOEIC
      More
    • resonance

      US /ˈrɛzənəns/

      UK /ˈrezənəns/

      • Noun (Countable/Uncountable)
      • Continuing to make a loud clear deep sound
      • The quality in a sound of being deep, full, and reverberating.
      C2
      More
    • sigma

      US /'sɪɡmə/

      UK /ˈsɪgmə/

      • Noun
      • 18th letter of the Greek alphabet -
      C1
      More
    • solution

      US /səˈluʃən/

      UK /səˈlu:ʃn/

      • Noun (Countable/Uncountable)
      • Mix of a liquid and a solid or a gas
      • Way to solve or deal with a problem
      A2
      More
    • structure

      US /ˈstrʌk.tʃɚ/

      UK /ˈstrʌk.tʃə/

      • Noun (Countable/Uncountable)
      • The way in which the parts of a system or object are arranged or organized, or a system arranged in this way
      • A building or other man-made object.
      • Transitive Verb
      • To plan, organize, or arrange the parts of something
      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
    • suppose

      US /səˈpoʊz/

      UK /sə'pəʊz/

      • Verb (Transitive/Intransitive)
      • To imagine or guess what might happen
      • Conjunction
      • What if
      A2TOEIC
      More
    • up there

      US /ʌp ðɛr/

      UK /ʌp ðɛə/

      • Adverb
      • In or to a higher place or position; far away.
      • In heaven.
      A1
      More
    • vicinity

      US /vɪˈsɪnɪti/

      UK /vəˈsɪnəti/

      • Noun
      • Surrounding or nearby region; proximity
      • An approximate amount or range.
      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
    #beta#acidic#carbon#ketone#resonance#compound

    Reactions of Beta-Dicarbonyl Compounds

    0
    Ken Lee posted on 2026/09/29
    Ever wondered what makes beta-dicarbonyl compounds so special in chemistry? This video dives into their surprising acidity, explaining how it enables reactions like alkylation and decarboxylation. You'll pick up key terms and understand the powerful synthetic applications of these compounds, which are often products of Claisen condensation!

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