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14 September, 20:01

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25 degrees Celsius over a right arrow. Delta over a right arrow. 2 a t m over a right arrow. Upper P t over a right arrow.

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Answers (2)
  1. 14 September, 20:48
    0
    just did edge test:

    answer: C. 2atm
  2. 14 September, 23:58
    0
    2 atm

    Explanation:

    Chemical reactions are carried out at a certain rate. Sometimes that rate is quite slow, so we want to speed things up, which is usually used by increasing temperature, increasing pressure or adding a catalyst (a substance that increases the rate without changing itself).

    If this is the case, then, when writing a chemical equation, we state these special conditions over a right arrow.

    Now let's look at the answers:

    - 25°C is a value and unit of temperature

    - ∆ is a symbol that denotes change

    - 2 atm is a value and unit of pressure (atmosphere is old unit for pressure)

    - Pt is a chemical symbol for platinum, an element often used as a catalyst.

    So, the correct answer is C) 2 atm
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