Vocabulary

• add up to: To amount to a particular sum or total.
• take for example: To use as an instance or illustration.
• for example: As an illustration or instance.
• write out: To write something in full instead of using abbreviations or symbols.
• except for: Not including; excluding.
• look at: To use your eyes to focus on something
• stuff: Generic description for things, materials, objects
• subscribe: To regularly pay to receive a service
• assume: To act in a false manner to mislead others
• negative: The opposite to a positive electrical charge
• associate: Partner in professional work, e.g. in law
• comprehension: Act of understanding, e.g. a reading text
• hypothetical: Thought up, as an example; not being a real case
• substance: Essence of; most basic or central qualities
• track: To use marks to follow a wild animal
• increase: To make or become larger in size or amount
• molecule: Two or more atoms chemically combined
• neutral: Something with pH value of 7
• occur: To come to pass or to happen
• explain: To make clear or easy to understand by describing
• cause: Belief, goal or organization that people support
• charge: To run quickly toward someone to attack them
• reaction: Bodily response to a drug or something eaten
• actual: Real or existing in fact, not imagined; real
• oxygen: A gas in the air that we need to breathe
• equation: Mathematical statement showing things to be equal
• reduce: To try to decrease, e.g. your weight if overweight
• element: Essential or particular part of something
• gain: To increase in something, such as weight
• leave: To go away from; depart
• agent: Chemical with the power to make chemical reactions
• dioxide: An oxide containing two oxides per molecule
• lot: What happens to a person in life from chance; fate
• reduction: Act of making something smaller
• carbon: Chemical element with an atomic number of 6
• channel: Long hole dug in the ground, e.g. to move water
• single: One run in cricket or a hit baseball
• flow: To move steadily and easily in a certain direction
• science: Study of the physical world, based on facts
• assign: To give someone a particular job to do
• decrease: To reduce the size, amount or number of something
• copper: Reddish-brown metal used in cables or wires
• chemistry: The study of the structure of substances
• hydrogen: Lightest of all chemical elements
• atom: Smallest bit that matter can be broken down into
• check: Paper showing how much you owe at a restaurant
• feel: To be aware of or experience an emotion, sensation
• lose: To be unable to keep in check or control something
• add: To include as well
• watch: To keep in check, manage, or control something
• number: Symbols such as 1, 2, 56, 793
• talk: Style of speaking
• write: To compose letters and words on paper or a screen
• oxidation: Process of combining with oxygen
• free: Living, happening without being controlled
• electron: A negatively charged particle
• ion: Atoms with either a positive or negative charge
• oxidize: To be exposed to oxygen, as when food goes brown
• email: A message like a letter sent by computer or phone